| Gene name | Length | Location | Length of alignment | Identity (%) | Coverage (%) | E-value |
|---|---|---|---|---|---|---|
| repA | 1101 | 1 - 1101 (+) | 1101 | 99 | 100 | 0 |
| ORF1832 | 5499 | 55288 - 60786 (+) | 5499 | 100 | 100 | 0 |
| RHS1 | 4254 | 149776 - 154029 (+) | 4254 | 100 | 100 | 0 |
| Type match | Model name | Model type | Location | E-value | Identity | ||||
|---|---|---|---|---|---|---|---|---|---|
| Perfect | arr-3 | protein homolog model | 108167 - 108619(+) | 2.33764e-112 | 100 % | ||||
|
AMR Gene Family
Enzyme responsible for the ADP-ribosylative inactivation of rifampin at the 23-OH position using NAD+.
Antibiotic
Rifampin is a semi-synthetic rifamycin, and inhibits RNA synthesis by binding to RNA polymerase. Rifampin is the mainstay agent for the treatment of tuberculosis, leprosy and complicated Gram-positive infections.
Antibiotic
Rifaximin is a semi-synthetic rifamycin used to treat traveller's diarrhea. Rifaximin inhibits RNA synthesis by binding to the beta subunit of bacterial RNA polymerase.
Antibiotic
Rifabutin is a semisynthetic rifamycin used in tuberculosis therapy. It inhibits DNA-dependent RNA synthesis.
Antibiotic
Rifapentine is a semisynthetic rifamycin that inhibits DNA-dependent RNA synthesis. It is often used in the treatment of tuberculosis and leprosy.
Drug Class
Rifamycin antibiotics are a group of broad-spectrum ansamycin antibiotics that inhibit bacterial RNA polymerase by binding to a highly conserved region, blocking the oligonucleotide exit tunnel, and preventing the extension of nascent mRNAs.
Resistance Mechanism
Enzymatic inactivation of antibiotic to confer drug resistance.
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| Perfect | cmlA5 | protein homolog model | 108940 - 110199(+) | 0 | 100 % | ||||
|
AMR Gene Family
Directed pumping of antibiotic out of a cell to confer resistance. Major facilitator superfamily (MFS) transporters and ABC transporters comprise the two largest and most functionally diverse of the transporter superfamilies. However, MFS transporters are distinct from ABC transporters in both their primary sequence and structure and in the mechanism of energy coupling. As secondary transporters they are, like RND and SMR transporters, energized by the electrochemical proton gradient.
Antibiotic
Chloramphenicol is a bacteriostatic antimicrobial originally derived from the bacterium Streptomyces venezuelae. It was the first antibiotic to be manufactured synthetically on a large scale. It functions by inhibiting peptidyl transferase activity of the bacterial ribosome, binding to A2451 and A2452 residues in the 23S rRNA of the 50S ribosomal subunit and preventing peptide bond formation.
Drug Class
Phenicols are broad spectrum bacteriostatic antibiotics acting on bacterial protein synthesis. More specifically, the phenicols block peptide elongation by binding to the peptidyltansferase centre of the 70S ribosome.
Efflux Component
Efflux proteins that pump antibiotic out of a cell to confer resistance.
Resistance Mechanism
Antibiotic resistance via the transport of antibiotics out of the cell.
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| Perfect | OXA-10 | protein homolog model | 110464 - 111264(+) | 0 | 100 % | ||||
|
AMR Gene Family
OXA beta-lactamases were long recognized as a less common but also plasmid-mediated beta-lactamase variety that could hydrolyze oxacillin and related anti-staphylococcal penicillins. These beta-lactamases differ from the TEM and SHV enzymes in that they belong to molecular class D and functional group 2d. The OXA-type beta-lactamases confer resistance to ampicillin and cephalothin and are characterized by their high hydrolytic activity against oxacillin and cloxacillin and the fact that they are poorly inhibited by clavulanic acid. Amino acid substitutions in OXA enzymes can also give the ESBL phenotype. The OXA beta-lactamase family was originally created as a phenotypic rather than a genotypic group for a few beta-lactamases that had a specific hydrolysis profile. Therefore, there is as little as 20% sequence homology among some of the members of this family. However, recent additions to this family show some degree of homology to one or more of the existing members of the OXA beta-lactamase family. Some confer resistance predominantly to ceftazidime, but OXA-17 confers greater resistance to cefotaxime and cefepime than it does resistance to ceftazidime.
Drug Class
Cephalosporins are a class of beta-lactam antibiotics, containing the beta-lactam ring fused with a dihydrothiazolidine ring. Together with cephamycins they belong to a sub-group called cephems. Cephalosporin are bactericidal, and act by inhibiting the synthesis of the peptidoglycan layer of bacterial cell walls. The peptidoglycan layer is important for cell wall structural integrity, especially in Gram-positive organisms.
Drug Class
Penams, often referred to as penicillins, are a group of antibiotics derived from Penicillium fungi. Penicillin antibiotics are historically significant because they are the first drugs that were effective against many previously serious diseases such as syphilis and Staphylococcus infections. Penicillins are still widely used today, though many types of bacteria are now resistant. All penicillins are beta-lactam antibiotics in the penam sub-group, and are used in the treatment of bacterial infections caused by susceptible, usually Gram-positive, organisms.
Resistance Mechanism
Enzymatic inactivation of antibiotic to confer drug resistance.
|
|||||||||
| Strict | ANT(3'')-IIa | protein homolog model | 111257 - 112072(+) | 0 | 99.63 % | ||||
|
AMR Gene Family
Nucleotidylylation of streptomycin at the hydroxyl group at position 3''
Drug Class
Aminoglycosides are a group of antibiotics that are mostly effective against Gram-negative bacteria. These molecules consist of aminated sugars attached to a dibasic cyclitol. Aminoglycosides work by binding to the bacterial 30S ribosomal subunit (some work by binding to the 50S subunit), inhibiting the translocation of the peptidyl-tRNA from the A-site to the P-site and also causing misreading of mRNA, leaving the bacterium unable to synthesize proteins vital to its growth.
Resistance Mechanism
Enzymatic inactivation of antibiotic to confer drug resistance.
|
|||||||||
| Perfect | sul1 | protein homolog model | 112577 - 113416(+) | 0 | 100 % | ||||
|
AMR Gene Family
The sul genes encode forms of dihydropteroate synthase that confer resistance to sulfonamide.
Antibiotic
Sulfadiazine is a potent inhibitor of dihydropteroate synthase, interfering with the tetrahydrofolic biosynthesis pathway. Tetrahydrofolic acid is essential for folate synthesis, a precursor to many nucleotides and amino acids.
Antibiotic
Sulfadimidine is an alkaline sulfonamide antibiotic that inhibits dihydropteroate synthase, and enzyme in the tetrahydrofolic acid biosynthesis pathway. This interferes with the production of folate, which is a precursor to many amino acids and nucleotides.
Antibiotic
Sulfadoxine is an inhibitor of dihydropteroate synthase, interfering with the tetrahydrofolic biosynthesis pathway. Tetrahydrofolic acid is essential for folate synthesis, a precursor to many nucleotides and amino acids.
Antibiotic
Sulfamethoxazole is a sulfonamide antibiotic usually taken with trimethoprim, a diaminopyrimidine antibiotic. Sulfamethoxazole inhibits dihydropteroate synthase, essential to tetrahydrofolic acid biosynthesis. This pathway generates compounds used in the synthesis of many amino acids and nucleotides.
Antibiotic
Sulfisoxazole is an inhibitor of dihydropteroate synthase, interfering with the tetrahydrofolic biosynthesis pathway. Tetrahydrofolic acid is essential for folate synthesis, a precursor to many nucleotides and amino acids.
Antibiotic
Sulfacetamide is a very soluable sulfonamide antibiotic previously used to treat urinary tract infections. Its relatively low activity and toxicity to those with Stevens-Johnson syndrome have reduced its use and availability.
Antibiotic
Mafenide is a sulfonamide used topically for treating burns.
Antibiotic
Sulfasalazine is a derivative of the early sulfonamide sulfapyridine (salicylazosulfapyridine). It was developed to increase water solubility and is taken orally for ulcerative colitis.
Antibiotic
Sulfamethizole is a short-acting sulfonamide that inhibits dihydropteroate synthetase.
Drug Class
Sulfonamides are broad spectrum, synthetic antibiotics that contain the sulfonamide group. Sulfonamides inhibit dihydropteroate synthase, which catalyzes the conversion of p-aminobenzoic acid to dihydropteroic acid as part of the tetrahydrofolic acid biosynthetic pathway. Tetrahydrofolic acid is essential for folate synthesis, a precursor of many nucleotides and amino acids. Many sulfamides are taken with trimethoprim, an inhibitor of dihydrofolate reductase, also disturbing the trihydrofolic acid synthesis pathway.
Resistance Mechanism
Replacement or substitution of antibiotic action target, which process will result in antibiotic resistance.
|
|||||||||
| Perfect | armA | protein homolog model | 116761 - 117534(+) | 0 | 100 % | ||||
|
AMR Gene Family
Methyltransferases that methylate the G1405 position of 16S rRNA, which is part of an aminoglycoside binding site.
Antibiotic
Dibekacin is an aminoglycoside antibiotic used to treat different types of bacterial infections. Dibekacin works by binding to the bacterial 30S ribosomal subunit, causing misreading of mRNA and leaving the bacterium unable to synthesize proteins vital to its growth.
Antibiotic
Amikacin is an aminoglycoside antibiotic that works by binding to the bacterial 30S ribosomal subunit, causing misreading of mRNA and leaving the bacterium unable to synthesize proteins vital to its growth.
Antibiotic
Gentamicin C is a mixture of gentamicin C1, gentamicin C1a, and gentamicin C2 (these differ in substituents at position C6'). Gentamicin works by binding to the bacterial 30S ribosomal subunit, causing misreading of mRNA and leaving the bacterium unable to synthesize proteins vital to its growth.
Antibiotic
Sisomicin is an aminoglycoside antibiotic used to treat different types of bacterial infections. Sisomicin works by binding to the bacterial 30S ribosomal subunit, causing misreading of mRNA and leaving the bacterium unable to synthesize proteins vital to its growth.
Antibiotic
Netilmicin is a member of the aminoglycoside family of antibiotics. These antibiotics have the ability to kill a wide variety of bacteria by binding to the bacterial 30S ribosomal subunit, causing misreading of mRNA and leaving the bacterium unable to synthesize proteins vital to its growth. Netilmicin is not absorbed from the gut and is therefore only given by injection or infusion. It is only used in the treatment of serious infections particularly those resistant to gentamicin.
Antibiotic
Kanamycin is an aminoglycoside antibiotic used to treat different types of bacterial infections. Kanamycin works by binding to the bacterial 30S ribosomal subunit, causing misreading of mRNA and leaving the bacterium unable to synthesize proteins vital to its growth.
Antibiotic
Tobramycin is an aminoglycoside antibiotic used to treat different types of bacterial infections. Tobramycin works by binding to the bacterial 30S ribosomal subunit, causing misreading of mRNA and leaving the bacterium unable to synthesize proteins vital to its growth.
Antibiotic
A semi-synthetic derivative of gentamicin B (hydroxyamino propionyl genamicin B). It is modified to combat microbial inactivation and has a slightly larger spectrum of activity compared to other aminoglycosides, including Ser marcescens, Enterobacteria, and K pneumoniae.
Antibiotic
A gentamicin class aminoglycoside antibiotic often used in mammalian cell culture work as a selectable marker for the neo cassette (APH3').
Antibiotic
A synthetic derivative (1-N-(4-amino-2-hydroxybutyryl) of dibekacin used in Japan. It is active against methicillin-resistant Staph. aureus and shows synergy with ampicillin when treating gentamicin and vancomycin resistant enterocci.
Antibiotic
Gentamicin B is a semisynthetic aminoglycoside antibacterial.
Drug Class
Aminoglycosides are a group of antibiotics that are mostly effective against Gram-negative bacteria. These molecules consist of aminated sugars attached to a dibasic cyclitol. Aminoglycosides work by binding to the bacterial 30S ribosomal subunit (some work by binding to the 50S subunit), inhibiting the translocation of the peptidyl-tRNA from the A-site to the P-site and also causing misreading of mRNA, leaving the bacterium unable to synthesize proteins vital to its growth.
Resistance Mechanism
Mutational alteration or enzymatic modification of antibiotic target which results in antibiotic resistance.
|
|||||||||
| Perfect | msrE | protein homolog model | 119833 - 121308(+) | 0 | 100 % | ||||
|
AMR Gene Family
A subfamily of the ATP-binding cassette protein superfamily. Unlike other ABC proteins, ABC-F genes are not fused to a transmembrane domain nor associated with transport. It has been shown that ABC-F proteins confer antibiotic resistance via ribosomal protection and not antibiotic efflux as in other ABC proteins.
Antibiotic
Erythromycin is a macrolide antibiotic with a 14-carbon ring that has an antimicrobial spectrum similar to or slightly wider than that of penicillin, and is often used for people that have an allergy to penicillins. Erythromycin may possess bacteriocidal activity, particularly at higher concentrations by binding to the 50S subunit of the bacterial 70S rRNA complex, inhibiting peptidyl-tRNA translocation. Thus, protein synthesis and subsequently structure/function processes critical for life or replication are inhibited.
Drug Class
Macrolides are a group of drugs (typically antibiotics) that have a large macrocyclic lactone ring of 12-16 carbons to which one or more deoxy sugars, usually cladinose and desosamine, may be attached. Macrolides bind to the 50S-subunit of bacterial ribosomes, inhibiting the synthesis of vital proteins.
Drug Class
Lincosamides (e.g. lincomycin, clindamycin) are a class of drugs which bind to the 23s portion of the 50S subunit of bacterial ribosomes. This interaction inhibits early elongation of peptide chains by inhibiting the transpeptidase reaction, acting similarly to macrolides.
Drug Class
Streptogramin antibiotics are natural products produced by various members of the Streptomyces genus. These antibiotics bind to the P site of the 50S subunit of bacterial ribosomes to inhibit protein synthesis. The family consists of two subgroups, type A and type B, which are simultaneously produced by the same bacterial species in a ratio of roughly 70:30.
Drug Class
These antibiotics are derived from tetracycline, a polyketide antibiotic that inhibits the 30S subunit of bacterial ribosomes.
Drug Class
Oxazolidinones are a class of synthetic antibiotics discovered the the 1980's. They inhibit protein synthesis by binding to domain V of the 23S rRNA of the 50S subunit of bacterial ribosomes. Linezolid is the only member of this class currently in clinical use.
Drug Class
Phenicols are broad spectrum bacteriostatic antibiotics acting on bacterial protein synthesis. More specifically, the phenicols block peptide elongation by binding to the peptidyltansferase centre of the 70S ribosome.
Drug Class
Pleuromutilins are natural fungal products that target bacterial protein translation by binding the the 23S rRNA, blocking the ribosome P site at the 50S subunit. They are mostly used for agriculture and veterinary purposes.
Resistance Mechanism
Protection of antibiotic action target from antibiotic binding, which process will result in antibiotic resistance.
|
|||||||||
| Perfect | mphE | protein homolog model | 121364 - 122248(+) | 0 | 100 % | ||||
|
AMR Gene Family
Macrolide phosphotransferases (MPH) are enzymes encoded by macrolide phosphotransferase genes (mph genes). These enzymes phosphorylate macrolides in GTP dependent manner at 2'-OH of desosamine sugar thereby inactivating them. Characterized MPH's are differentiated based on their substrate specificity.
Drug Class
Macrolides are a group of drugs (typically antibiotics) that have a large macrocyclic lactone ring of 12-16 carbons to which one or more deoxy sugars, usually cladinose and desosamine, may be attached. Macrolides bind to the 50S-subunit of bacterial ribosomes, inhibiting the synthesis of vital proteins.
Resistance Mechanism
Enzymatic inactivation of antibiotic to confer drug resistance.
|
|||||||||
| Perfect | CTX-M-15 | protein homolog model | 127991 - 128866(-) | 0 | 100 % | ||||
|
AMR Gene Family
These enzymes were named for their greater activity against cefotaxime than other oxyimino-beta-lactam substrates (eg, ceftazidime, ceftriaxone, or cefepime). Rather than arising by mutation, they represent examples of plasmid acquisition of beta-lactamase genes normally found on the chromosome of Kluyvera species, a group of rarely pathogenic commensal organisms. These enzymes are not very closely related to TEM or SHV beta-lactamases in that they show only approximately 40% identity with these two commonly isolated beta-lactamases. Despite their name, a few are more active on ceftazidime than cefotaxime. CTX-M-15 was recently found in bacterial strains expressing NDM-1 and were responsible for resistance to aztreonam.
Antibiotic
Ceftazidime is a third-generation cephalosporin antibiotic. Like other third-generation cephalosporins, it has broad spectrum activity against Gram-positive and Gram-negative bacteria. Unlike most third-generation agents, it is active against Pseudomonas aeruginosa, however it has weaker activity against Gram-positive microorganisms and is not used for such infections.
Antibiotic
Ceftriaxone is a third-generation cephalosporin antibiotic. The presence of an aminothiazolyl sidechain increases ceftriazone's resistance to beta-lactamases. Like other third-generation cephalosporins, it has broad spectrum activity against Gram-positive and Gram-negative bacteria.
Antibiotic
Cefalotin is a semisynthetic cephalosporin antibiotic activate against staphylococci. It is resistant to staphylococci beta-lactamases but hydrolyzed by enterobacterial beta-lactamases.
Drug Class
Cephalosporins are a class of beta-lactam antibiotics, containing the beta-lactam ring fused with a dihydrothiazolidine ring. Together with cephamycins they belong to a sub-group called cephems. Cephalosporin are bactericidal, and act by inhibiting the synthesis of the peptidoglycan layer of bacterial cell walls. The peptidoglycan layer is important for cell wall structural integrity, especially in Gram-positive organisms.
Resistance Mechanism
Enzymatic inactivation of antibiotic to confer drug resistance.
|
|||||||||
| Strict | AAC(6')-Ib10 | protein homolog model | 132516 - 133121(+) | 2.96471e-145 | 98.97 % | ||||
|
AMR Gene Family
Acetylation of the aminoglycoside antibiotic on the amino group at position 6'.
Antibiotic
Neomycin is an aminoglycoside antibiotic used to treat different types of bacterial infections. Neomycin works by binding to the bacterial 30S ribosomal subunit, causing misreading of mRNA and leaving the bacterium unable to synthesize proteins vital to its growth.
Antibiotic
Dibekacin is an aminoglycoside antibiotic used to treat different types of bacterial infections. Dibekacin works by binding to the bacterial 30S ribosomal subunit, causing misreading of mRNA and leaving the bacterium unable to synthesize proteins vital to its growth.
Antibiotic
Amikacin is an aminoglycoside antibiotic that works by binding to the bacterial 30S ribosomal subunit, causing misreading of mRNA and leaving the bacterium unable to synthesize proteins vital to its growth.
Antibiotic
Sisomicin is an aminoglycoside antibiotic used to treat different types of bacterial infections. Sisomicin works by binding to the bacterial 30S ribosomal subunit, causing misreading of mRNA and leaving the bacterium unable to synthesize proteins vital to its growth.
Antibiotic
Netilmicin is a member of the aminoglycoside family of antibiotics. These antibiotics have the ability to kill a wide variety of bacteria by binding to the bacterial 30S ribosomal subunit, causing misreading of mRNA and leaving the bacterium unable to synthesize proteins vital to its growth. Netilmicin is not absorbed from the gut and is therefore only given by injection or infusion. It is only used in the treatment of serious infections particularly those resistant to gentamicin.
Antibiotic
Kanamycin is an aminoglycoside antibiotic used to treat different types of bacterial infections. Kanamycin works by binding to the bacterial 30S ribosomal subunit, causing misreading of mRNA and leaving the bacterium unable to synthesize proteins vital to its growth.
Antibiotic
Tobramycin is an aminoglycoside antibiotic used to treat different types of bacterial infections. Tobramycin works by binding to the bacterial 30S ribosomal subunit, causing misreading of mRNA and leaving the bacterium unable to synthesize proteins vital to its growth.
Antibiotic
A semi-synthetic derivative of gentamicin B (hydroxyamino propionyl genamicin B). It is modified to combat microbial inactivation and has a slightly larger spectrum of activity compared to other aminoglycosides, including Ser marcescens, Enterobacteria, and K pneumoniae.
Antibiotic
A synthetic derivative (1-N-(4-amino-2-hydroxybutyryl) of dibekacin used in Japan. It is active against methicillin-resistant Staph. aureus and shows synergy with ampicillin when treating gentamicin and vancomycin resistant enterocci.
Antibiotic
Gentamicin B is a semisynthetic aminoglycoside antibacterial.
Drug Class
Aminoglycosides are a group of antibiotics that are mostly effective against Gram-negative bacteria. These molecules consist of aminated sugars attached to a dibasic cyclitol. Aminoglycosides work by binding to the bacterial 30S ribosomal subunit (some work by binding to the 50S subunit), inhibiting the translocation of the peptidyl-tRNA from the A-site to the P-site and also causing misreading of mRNA, leaving the bacterium unable to synthesize proteins vital to its growth.
Resistance Mechanism
Enzymatic inactivation of antibiotic to confer drug resistance.
|
|||||||||
| Strict | ANT(3'')-IIa | protein homolog model | 133203 - 133979(+) | 0 | 99.23 % | ||||
|
AMR Gene Family
Nucleotidylylation of streptomycin at the hydroxyl group at position 3''
Drug Class
Aminoglycosides are a group of antibiotics that are mostly effective against Gram-negative bacteria. These molecules consist of aminated sugars attached to a dibasic cyclitol. Aminoglycosides work by binding to the bacterial 30S ribosomal subunit (some work by binding to the 50S subunit), inhibiting the translocation of the peptidyl-tRNA from the A-site to the P-site and also causing misreading of mRNA, leaving the bacterium unable to synthesize proteins vital to its growth.
Resistance Mechanism
Enzymatic inactivation of antibiotic to confer drug resistance.
|
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| Perfect | OXA-9 | protein homolog model | 134039 - 134863(+) | 0 | 100 % | ||||
|
AMR Gene Family
OXA beta-lactamases were long recognized as a less common but also plasmid-mediated beta-lactamase variety that could hydrolyze oxacillin and related anti-staphylococcal penicillins. These beta-lactamases differ from the TEM and SHV enzymes in that they belong to molecular class D and functional group 2d. The OXA-type beta-lactamases confer resistance to ampicillin and cephalothin and are characterized by their high hydrolytic activity against oxacillin and cloxacillin and the fact that they are poorly inhibited by clavulanic acid. Amino acid substitutions in OXA enzymes can also give the ESBL phenotype. The OXA beta-lactamase family was originally created as a phenotypic rather than a genotypic group for a few beta-lactamases that had a specific hydrolysis profile. Therefore, there is as little as 20% sequence homology among some of the members of this family. However, recent additions to this family show some degree of homology to one or more of the existing members of the OXA beta-lactamase family. Some confer resistance predominantly to ceftazidime, but OXA-17 confers greater resistance to cefotaxime and cefepime than it does resistance to ceftazidime.
Drug Class
Cephalosporins are a class of beta-lactam antibiotics, containing the beta-lactam ring fused with a dihydrothiazolidine ring. Together with cephamycins they belong to a sub-group called cephems. Cephalosporin are bactericidal, and act by inhibiting the synthesis of the peptidoglycan layer of bacterial cell walls. The peptidoglycan layer is important for cell wall structural integrity, especially in Gram-positive organisms.
Drug Class
Penams, often referred to as penicillins, are a group of antibiotics derived from Penicillium fungi. Penicillin antibiotics are historically significant because they are the first drugs that were effective against many previously serious diseases such as syphilis and Staphylococcus infections. Penicillins are still widely used today, though many types of bacteria are now resistant. All penicillins are beta-lactam antibiotics in the penam sub-group, and are used in the treatment of bacterial infections caused by susceptible, usually Gram-positive, organisms.
Resistance Mechanism
Enzymatic inactivation of antibiotic to confer drug resistance.
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| Perfect | TEM-1 | protein homolog model | 138650 - 139510(+) | 0 | 100 % | ||||
|
AMR Gene Family
TEM-1 is the most commonly-encountered beta-lactamase in gram-negative bacteria. Up to 90% of ampicillin resistance in E. coli is due to the production of TEM-1. Also responsible for the ampicillin and penicillin resistance that is seen in H. influenzae and N. gonorrhoeae in increasing numbers. Although TEM-type beta-lactamases are most often found in E. coli and K. pneumoniae, they are also found in other species of gram-negative bacteria with increasing frequency. The amino acid substitutions responsible for the ESBL phenotype cluster around the active site of the enzyme and change its configuration, allowing access to oxyimino-beta-lactam substrates. Opening the active site to beta-lactam substrates also typically enhances the susceptibility of the enzyme to b-lactamase inhibitors, such as clavulanic acid. Although the inhibitor-resistant beta-lactamases are not ESBLs, they are often discussed with ESBLs because they are also derivatives of the classical TEM- or SHV-type enzymes. These enzymes were at first given the designation IRT for inhibitor-resistant TEM beta-lactamase; however, all have subsequently been renamed with numerical TEM designations. There are at least 19 distinct inhibitor-resistant TEM beta-lactamases. Inhibitor-resistant TEM beta-lactamases have been found mainly in clinical isolates of E. coli, but also some strains of K. pneumoniae, Klebsiella oxytoca, P. mirabilis, and Citrobacter freundii. Although the inhibitor-resistant TEM variants are resistant to inhibition by clavulanic acid and sulbactam, thereby showing clinical resistance to the beta-lactam-lactamase inhibitor combinations of amoxicillin-clavulanate (Co-amoxiclav), ticarcillin-clavulanate, and ampicillin/sulbactam, they normally remain susceptible to inhibition by tazobactam and subsequently the combination of piperacillin/tazobactam, although resistance has been described.
Antibiotic
Amoxicillin is a moderate-spectrum, bacteriolytic, beta-lactam antibiotic used to treat bacterial infections caused by susceptible microorganisms. A derivative of penicillin, it has a wider range of treatment but remains relatively ineffective against Gram-negative bacteria. It is commonly taken with clavulanic acid, a beta-lactamase inhibitor. Like other beta-lactams, amoxicillin interferes with the synthesis of peptidoglycan.
Antibiotic
Ampicillin is a penicillin derivative that is highly acid stable, with its activity similar to benzylpenicillin.
Antibiotic
Cefalotin is a semisynthetic cephalosporin antibiotic activate against staphylococci. It is resistant to staphylococci beta-lactamases but hydrolyzed by enterobacterial beta-lactamases.
Drug Class
Monobactams are a class of beta-lactam antibiotics with a broad spectrum of antibacterial activity, and have a structure which renders them highly resistant to beta-lactamases. Unlike penams and cephems, monobactams do not have any ring fused to its four-member lactam structure. Monobactam antibiotics are bactericidal, and act by inhibiting the synthesis of the peptidoglycan layer of bacterial cell walls. The peptidoglycan layer is important for cell wall structural integrity, especially in Gram-positive organisms.
Drug Class
Cephalosporins are a class of beta-lactam antibiotics, containing the beta-lactam ring fused with a dihydrothiazolidine ring. Together with cephamycins they belong to a sub-group called cephems. Cephalosporin are bactericidal, and act by inhibiting the synthesis of the peptidoglycan layer of bacterial cell walls. The peptidoglycan layer is important for cell wall structural integrity, especially in Gram-positive organisms.
Drug Class
Penams, often referred to as penicillins, are a group of antibiotics derived from Penicillium fungi. Penicillin antibiotics are historically significant because they are the first drugs that were effective against many previously serious diseases such as syphilis and Staphylococcus infections. Penicillins are still widely used today, though many types of bacteria are now resistant. All penicillins are beta-lactam antibiotics in the penam sub-group, and are used in the treatment of bacterial infections caused by susceptible, usually Gram-positive, organisms.
Drug Class
Penems are a class of unsaturated beta-lactam antibiotics with a broad spectrum of antibacterial activity and have a structure which renders them highly resistant to beta-lactamases. All penems are all synthetically made and act by inhibiting the synthesis of the peptidoglycan layer of bacterial cell walls. They are structurally similar to carbapenems, however, where carbapenems have a carbon, penems have a sulfur.
Resistance Mechanism
Enzymatic inactivation of antibiotic to confer drug resistance.
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