Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation

V - Defense mechanisms

Download

Stats

COG
definitions
Organims Proteins Median Protein
Length
Genes
181 2,289 207,453 324.0 158
Organism Protein COG Cat Annotation
2016 6301 COG0251 V Enamine deaminase RidA/Endoribonuclease Rid7C, YjgF/YER057c/UK114 family
1543 3537 COG0286 V Type I restriction-modification system, DNA methylase subunit
1209 3101 COG0312 V O Zn-dependent protease or N-deacetylase, PmbA/TldD/TldE family
1133 1522 COG0386 V I Thioredoxin/glutathione peroxidase BtuE, reduces lipid peroxides
2043 6339 COG0388 V Nitrilase/amidase YafV/Nit2, hydrolyzes deaminated glutathione
1665 2528 COG0450 V Alkyl hydroperoxide reductase subunit AhpC (peroxiredoxin)
2021 5714 COG0494 V 8-oxo-dGTP pyrophosphatase MutT and related house-cleaning NTP pyrophosphohydrolases, NUDIX family
1860 6458 COG0534 V Na+-driven multidrug efflux pump, DinF/NorM/MATE family
1662 6238 COG0577 V ABC-type antimicrobial peptide transport system, permease component
1064 1626 COG0610 V Type I site-specific restriction-modification system, R (restriction) subunit and related helicases ...
989 1405 COG0627 V S-formylglutathione hydrolase FrmB
1632 3243 COG0693 V Protein/nucleotide deglycase, PfpI/YajL/DJ-1 family (repair of methylglyoxal-glycated proteins and nucleic acids)
1292 2487 COG0732 V Restriction endonuclease S subunit
1385 2701 COG0737 V F 2',3'-cyclic-nucleotide 2'-phosphodiesterase/5'- or 3'-nucleotidase, 5'-nucleotidase family
1663 1719 COG0756 V F dUTP pyrophosphatase (dUTPase)
1659 8652 COG0841 V Multidrug efflux pump subunit AcrB
1895 6282 COG0842 V ABC-type multidrug transport system, permease component
1713 11708 COG0845 V M Multidrug efflux pump subunit AcrA (membrane-fusion protein)
207 244 COG1002 V Type II restriction/modification system, endonuclease and methylase domains
84 85 COG1059 L V Thermostable 8-oxoguanine DNA glycosylase
2184 16983 COG1131 J V Ribosome-associated ATPase or ATPase component of an ABC-type multidrug transport system
2159 13012 COG1132 V ABC-type multidrug transport system, ATPase and permease component
121 121 COG1133 V Peptide antibiotic transporter SbmA/BacA, ABC-type permease family
763 996 COG1203 V CRISPR-Cas type I system-associated endonuclease/helicase Cas3
511 590 COG1275 V Tellurite resistance protein TehA and related permeases
112 116 COG1332 V CRISPR-Cas system type III CSM-effector complex subunit Csm5, RAMP superfamily Cas7 group
196 249 COG1336 V CRISPR-Cas system type III CMR-effector complex subunit Cmr4, RAMP superfamily Cas7 group
229 467 COG1337 V CRISPR-Cas system type III CSM-effector complex subunit Csm3, RAMP superfamily Cas7 group
685 1005 COG1343 V CRISPR/Cas system-associated endoribonuclease Cas2
289 384 COG1353 V CRISPR/Cas system-associated protein Cas10, large subunit of type III CRISPR-Cas systems, contains HD superfamily nuclease domain
130 142 COG1367 V CRISPR-Cas system type III CMR-effector complex subunit Cmr1, RAMP superfamily Cas7 group
458 531 COG1401 V 5-methylcytosine-specific restriction endonuclease McrBC, GTP-binding regulatory subunit McrB
1268 2515 COG1403 V 5-methylcytosine-specific restriction endonuclease McrA
67 71 COG1421 V CRISPR-Cas system type III CSM-effector complex small subunit Csm2
53 60 COG1431 J V PIWI domain, catalyzes dsRNA-guided hydrolysis of ssRNA, involved in RNA silencing, RNA metabolism and antiviral defense
660 883 COG1468 V CRISPR/Cas system-associated exonuclease Cas4, RecB family
668 911 COG1479 V DNAse/DNA nickase specific for phosphorothioated or glycosylated phage DNA, GmrSD/DndB/SspE family, contains DUF262 and HNH nuclease domains
846 2451 COG1487 V Ribonuclease/mRNA interferase VapC, contains PIN domain
32 46 COG1517 V CRISPR/Cas system-associated protein Csx1, contains CARF domain
1010 1527 COG1518 V CRISPR-Cas system-associated integrase Cas1
1515 7857 COG1566 V Multidrug resistance efflux pump EmrA
112 116 COG1567 V CRISPR-Cas system type III CSM-effector complex subunit Csm4, RAMP superfamily Cas5 group
242 268 COG1578 V House-cleaning carbohydrate phosphatase, DUF89 family
272 362 COG1583 V CRISPR/Cas system endoribonuclease Cas6, RAMP superfamily
666 1916 COG1598 V Antitoxin component HicB of the HicAB toxin-antitoxin system
172 202 COG1604 V CRISPR/Cas system CMR subunit Cmr6, Cas7 group, RAMP superfamily
205 208 COG1659 V Bacteriocin, linocin/CFP29 family
1533 7460 COG1680 V CubicO group peptidase, beta-lactamase class C family
137 150 COG1688 V CRISPR/Cas system-associated protein Cas5, RAMP superfamily
844 1020 COG1694 V NTP pyrophosphatase, house-cleaning of non-canonical NTPs
78 80 COG1700 V Predicted anti-virus defense system component AQ645, contains DUF2357 and PD-(D/E)xK nuclease domains
514 636 COG1715 V Restriction endonuclease Mrr
64 105 COG1753 V Predicted antitoxin, CopG family
1047 1916 COG1764 V Organic hydroperoxide reductase OsmC/OhrA
110 121 COG1769 V CRISPR-Cas system type III CMR-effector complex subunit Cmr3, RAMP superfamily Cas5 group
170 215 COG1787 V Endonuclease, HJR/Mrr/RecB family
915 1270 COG1842 V T Phage shock protein A, part of CBASS system
421 864 COG1848 V VapC family ribonuclease, toxin component of the VapBC toxin-antitoxin module, contains PIN domain
141 158 COG1857 V CRISPR-Cas system type I effector complex subunit Cas7, RAMP superfamily
203 279 COG1895 V HEPN domain protein, predicted toxin of MNT-HEPN system
669 722 COG1912 V H Stereoselective (R,S)-S-adenosylmethionine hydrolase (adenosine-forming)
926 1075 COG1956 V T GAF domain-containing protein, putative methionine-R-sulfoxide reductase
308 318 COG1986 V F Non-canonical (house-cleaning) NTP pyrophosphatase, all-alpha NTP-PPase family
577 1017 COG2002 K V Bifunctional DNA-binding transcriptional regulator of stationary/sporulation/toxin gene expression and antitoxin component of the YhaV-PrlF toxin-antitoxin module
684 1272 COG2026 V mRNA-degrading endonuclease RelE, toxin component of the RelBE toxin-antitoxin system
1236 2350 COG2076 V Multidrug transporter EmrE and related cation transporters
959 4855 COG2124 V Q Cytochrome P450
605 1011 COG2161 V Antitoxin component YafN of the YafNO toxin-antitoxin module, PHD/YefM family
231 592 COG2250 V HEPN domain protein, predicted toxin of MNT-HEPN system
352 461 COG2253 V Predicted nucleotidyltransferase component of viral defense system
31 36 COG2254 V CRISPR/Cas system-associated endonuclease Cas3-HD
1013 1328 COG2258 V F N-hydroxylaminopurine reductase YiiM, contains MOSC domain
1163 2673 COG2274 V ABC-type bacteriocin/lantibiotic exporters, contain an N-terminal double-glycine peptidase domain
395 525 COG2336 V Antitoxin component MazE of the MazEF toxin-antitoxin module
898 1574 COG2337 V mRNA-degrading endonuclease MazF, toxin component of the MazEF toxin-antitoxin module
444 859 COG2361 V HEPN domain protein, predicted toxin of MNT-HEPN system
854 1382 COG2367 V Beta-lactamase class A
333 1199 COG2442 V Predicted antitoxin component of a toxin-antitoxin system, DUF433 family
265 286 COG2602 V Beta-lactamase class D
466 690 COG2720 V Vancomycin resistance protein YoaR (function unknown), contains peptidoglycan-binding and VanW domains
244 276 COG2746 V Aminoglycoside N3'-acetyltransferase
81 85 COG2810 V Predicted type IV restriction endonuclease
381 1050 COG2849 V Antitoxin component YwqK of the YwqJK toxin-antitoxin module
478 538 COG2914 V Putative antitoxin component PasI (RatB) of the RatAB toxin-antitoxin module, ubiquitin-RnfH superfamily
359 738 COG2929 V Ribonuclease BrnT, toxin component of the BrnT-BrnA toxin-antitoxin system
191 208 COG3015 V M Uncharacterized lipoprotein NlpE involved in copper resistance
292 421 COG3041 J V mRNA-degrading endonuclease YafQ (mRNA interferase), toxin component of the YafQ-DinJ toxin-antitoxin module
120 154 COG3059 V Reactive chlorine resistance protein RclC/YkgB, DUF417 family
362 614 COG3077 V Antitoxin component of the RelBE or YafQ-DinJ toxin-antitoxin module
765 1295 COG3093 V Plasmid maintenance system antidote protein VapI/HigA, contains XRE-type HTH domain
213 214 COG3155 V Glyoxalase ElbB, DJ-1 superfamily
263 283 COG3183 V Predicted restriction endonuclease, HNH family
734 829 COG3217 V F N-hydroxylaminopurine reductase subunit YcbX, contains MOSC domain
289 354 COG3236 V H N-glycosidase YbiA/RibX (riboflavin biosynthesis, damage control), NADAR superfamily
47 55 COG3309 V Virulence-associated protein VapD, endoribonuclease
88 91 COG3337 V CRISPR-Cas system type III CMR-effector complex small subunit Cmr5
676 2601 COG3415 V CRISPR-associated protein Csa3, CARF domain
59 65 COG3421 V Type III restriction endonuclease
471 560 COG3440 V Predicted restriction endonuclease
832 1481 COG3467 V Nitroimidazole reductase NimA or a related FMN-containing flavoprotein, pyridoxamine 5'-phosphate oxidase superfamily
139 158 COG3510 V Cephalosporin hydroxylase
196 203 COG3512 V CRISPR/Cas system-associated protein Cas2
202 214 COG3513 V CRISPR-Cas system type-II protein Cas9
279 466 COG3514 V Antitoxin component of the BrnT-BrnA toxin-antitoxin system
466 680 COG3549 V Plasmid maintenance system killer protein
208 258 COG3570 V Streptomycin 6-kinase
92 109 COG3582 V CDC48-associated ubiquitin-like protein CUZ1, contains AN1-type Zn-finger (protection from As/Sb toxicity)
293 341 COG3587 V Restriction endonuclease, type III RM system
626 667 COG3634 V Alkyl hydroperoxide reductase subunit AhpF
374 413 COG3649 V CRISPR-Cas system type I effector complex subunit Cas7, RAMP superfamily
271 381 COG3657 V Putative component of the toxin-antitoxin plasmid stabilization module
168 168 COG3725 V Membrane protein AmpE required for beta-lactamase induction
136 210 COG3742 V VapC family ribonuclease, contains PIN domain
366 732 COG3744 V PIN domain nuclease, a component of toxin-antitoxin system (PIN domain)
436 491 COG3853 V Uncharacterized conserved protein YaaN involved in tellurite resistance
100 115 COG3896 V Chloramphenicol 3-O-phosphotransferase
88 102 COG4006 V CRISPR-Cas system-associated protein Csm6, contains CARF domain
33 33 COG4088 J V tRNA uridine 5-carbamoylmethylation protein Kti12 (Killer toxin insensitivity protein)
567 747 COG4096 V Type I site-specific restriction endonuclease, part of a restriction-modification system
103 123 COG4110 V Tellurium resistance protein TerA/TerD
348 636 COG4113 V RNA interferase (RNase) VapC, contains PIN domain
467 672 COG4115 V Toxin component of the Txe-Axe toxin-antitoxin module, Txe/YoeB family
560 1254 COG4118 V Antitoxin component of toxin-antitoxin stability system, DNA-binding transcriptional repressor
130 131 COG4167 V ABC-type antimicrobial peptide export system, ATPase component SapF
122 122 COG4168 V ABC-type antimicrobial peptide export system, permease component SapB
130 130 COG4170 V ABC-type antimicrobial peptide export system, ATPase component SapD
142 142 COG4171 V ABC-type antimicrobial peptide export system, permease component SapC
132 208 COG4200 V Predicted lantabiotic-exporting membrane pepmease, EfiE/EfiG/ABC2 family
293 439 COG4257 V Streptogramin lyase
329 361 COG4268 V 5-methylcytosine-specific restriction endonuclease McrBC, regulatory subunit McrC
38 46 COG4343 V CRISPR/Cas system-associated exonuclease Cas4, RecB family
81 103 COG4374 V PIN domain nuclease, a component of toxin-antitoxin system (PIN domain)
169 271 COG4403 V Lantibiotic modifying enzyme
112 156 COG4423 V VapB family antitoxin component of VapBC type II toxin-antitoxin module
238 243 COG4452 V Inner membrane protein CreD involved in colicin E2 resistance
195 251 COG4461 V Lysozyme inhibitor LprI
373 530 COG4679 V X Phage-related protein gp49, toxin component of the Tad-Ata toxin-antitoxin system
268 374 COG4680 J V mRNA-degrading endonuclease (mRNA interferase) HigB, toxic component of the HigAB toxin-antitoxin module
145 192 COG4683 V HigB/gp49-like toxin component of RelE/ParE type II toxin-antitoxin system
241 303 COG4691 V Plasmid stability protein StbC1, contains ribbon-helix-helix domain
74 91 COG4734 V Antirestriction protein ArdA
355 580 COG4767 V Glycopeptide antibiotics resistance protein
272 345 COG4823 V Abortive infection bacteriophage resistance protein
283 297 COG4832 V T Cyclopropanoid cyclopropyl hydrolase, GyrI-like domain
264 634 COG4842 V Secreted virulence factor YukE/EsxA, WXG100 family
229 269 COG4845 V Chloramphenicol O-acetyltransferase
145 155 COG4924 V Nuclease subunit JetD of Wadjet anti-plasmid defense system, contains DUF3322 and JetD_C (DUF2220) domains
397 546 COG5340 V Abortive phage infection protein AbiEi, antitoxin conponent of an AbiEi-AbiEii TA system
153 254 COG5428 V Predicted antitoxin component YuzE of a toxin-antitoxin system, DUF2283 family
237 263 COG5441 V ATP-binding helicase-inhibiting domain, Tm-1/UPF0261 family
35 114 COG5444 V Predicted ribonuclease, toxin component of the YeeF-YezG toxin-antitoxin module
328 481 COG5499 V Antitoxin component HigA of the HigAB toxin-antitoxin module, contains an N-terminal HTH domain
129 129 COG5503 K V DNA-dependent RNA polymerase auxiliary subunit epsilon
317 412 COG5510 V Entericidin EcnA/EcnB
147 213 COG5551 V CRISPR/Cas system endoribonuclease Cas6, RAMP superfamily
232 330 COG5606 V Antitoxin component of the Tad-Ata toxin-antitoxin system, contains XRE-type HTH domain
234 269 COG5608 V Dessication stress tolerance protein, LEA/WHy domain
241 334 COG5642 V Predicted antitoxin component of a toxin-antitoxin system, contains Xre-type HTH domain
283 398 COG5654 V Predicted toxin component of a toxin-antitoxin system, contains RES domain
219 234 COG5658 V Bacterial immunity/signal transduction membrane protein SdpI, SdpI/YbgB/DUF1648 family
68 81 COG5930 V CRISPR-Cas system type I-D effector complex large subunit Cas10d/Csc3, contains HD superfamily nuclease domain
13 14 COG5931 V CRISPR-Cas system type-V protein Cas12a
90 100 COG5932 V CRISPR-Cas type I-F system-associated endonuclease/helicase Cas3f, fused to Cas2 domain
92 96 COG5933 V CRISPR-Cas system type I-F effector complex subunit Cas5f/Csy2, RAMP superfamily
235 259 COG5934 V CRISPR-Cas system endoribonuclease Cas6e, RAMP superfamily
96 104 COG5935 V CRISPR-Cas system endoribonuclease Cas6f/Csy4, RAMP superfamily
92 98 COG5936 V CRISPR-Cas system type I-F effector complex subunit Cas7f/Csy3, RAMP superfamily
14 14 COG5937 V CRISPR-Cas system type I-A effector complex large subunit Cas8a4
119 129 COG5938 V CRISPR-Cas system type I-B effector complex large subunit Cas8b1
84 91 COG5939 V CRISPR-Cas system type I-B effector complex large subunit Cas8b2
19 19 COG5940 V CRISPR-Cas system type I-B effector complex large subunit Cas8b3
234 246 COG5941 V CRISPR-Cas system type I-C effector complex large subunit Cas8c
225 246 COG5942 V CRISPR-Cas system type I-E effector complex large subunit Cas8e
89 92 COG5943 V CRISPR-Cas system type I-F effector complex large subunit Cas8f
43 50 COG5944 V CRISPR-Cas system type I-G effector complex large subunit Cas8g1
59 68 COG5945 V CRISPR-Cas system type I-G effector complex subunit Csb1, RAMP superfamily Cas7 group
59 71 COG5946 V CRISPR-Cas system type I-G effector complex subunit Csb5, RAMP superfamily Cas5 group
69 76 COG5947 V CRISPR-Cas system type I-D effector complex subunit Csc1, RAMP superfamily Cas5 group
78 86 COG5948 V CRISPR-Cas system type I-D effector complex subunit Csc2, RAMP superfamily Cas7 group
225 245 COG5949 V CRISPR-Cas system type I-E effector complex small subunit Cse2
140 162 COG5950 V CRISPR-Cas system type II-D effector complex subunit Csx10, RAMP superfamily Cas5 group