Adenosylcobinamide-GDP ribazoletransferase

Adenosylcobinamide-GDP ribazoletransferase (EC 2.7.8.26, CobS, cobalamin synthase, cobalamin-5'-phosphate synthase, cobalamin (5'-phosphate) synthase) is an enzyme with systematic name adenosylcobinamide-GDP:alpha-ribazole ribazoletransferase. This enzyme catalyses the following chemical reaction

(1) adenosylcobinamide-GDP + alpha-ribazole

\rightleftharpoons

GMP + adenosylcobalamin

(2) adenosylcobinamide-GDP + alpha-ribazole 5'-phosphate

\rightleftharpoons

GMP + adenosylcobalamin 5'-phosphate

This enzyme is part of the biosynthetic pathway to cobalamin (vitamin B₁₂) in bacteria.

References

Maggio-Hall LA, Escalante-Semerena JC (October 1999). "In vitro synthesis of the nucleotide loop of cobalamin by Salmonella typhimurium enzymes". Proceedings of the National Academy of Sciences of the United States of America. 96 (21): 11798–803. Bibcode:1999PNAS...9611798M. doi:10.1073/pnas.96.21.11798. PMC 18366. PMID 10518530.
Warren MJ, Raux E, Schubert HL, Escalante-Semerena JC (August 2002). "The biosynthesis of adenosylcobalamin (vitamin B12)". Natural Product Reports. 19 (4): 390–412. doi:10.1039/b108967f. PMID 12195810.
Cameron B, Blanche F, Rouyez MC, Bisch D, Famechon A, Couder M, Cauchois L, Thibaut D, Debussche L, Crouzet J (October 1991). "Genetic analysis, nucleotide sequence, and products of two Pseudomonas denitrificans cob genes encoding nicotinate-nucleotide: dimethylbenzimidazole phosphoribosyltransferase and cobalamin (5'-phosphate) synthase". Journal of Bacteriology. 173 (19): 6066–73. doi:10.1128/jb.173.19.6066-6073.1991. PMC 208353. PMID 1917841.

External links

Adenosylcobinamide-GDP+ribazoletransferase at the U.S. National Library of Medicine Medical Subject Headings (MeSH)

Transferases: phosphorus-containing groups (EC 2.7)

2.7.1-2.7.4:
phosphotransferase/kinase
(PO₄)

2.7.1: OH acceptor	Hexo- Gluco- Fructo- Hepatic Galacto- Phosphofructo- 1 Liver Muscle Platelet 2 Riboflavin Shikimate Thymidine ADP-thymidine NAD Glycerol Pantothenate Mevalonate Pyruvate Deoxycytidine PFP Diacylglycerol Phosphoinositide 3 Class I PI 3 Class II PI 3 Sphingosine Glucose-1,6-bisphosphate synthase
2.7.2: COOH acceptor	Phosphoglycerate Aspartate kinase
2.7.3: N acceptor	Creatine
2.7.4: PO₄ acceptor	Phosphomevalonate Adenylate Nucleoside-diphosphate Uridylate Guanylate Thiamine-diphosphate

2.7.6: diphosphotransferase
(P₂O₇)

2.7.7: nucleotidyltransferase
(PO₄-nucleoside)

Polymerase

DNA polymerase

DNA-directed DNA polymerase

I/A

Taq

II/B

Pfu

III/C

IV/X

TDT

V/Y

RNA-directed DNA polymerase

Reverse transcriptase

Telomerase

RNA polymerase

Template-directed

RNA-dependent RNA polymerase

Polyadenylation

PAP

PNPase

Phosphorolytic
3' to 5' exoribonuclease

Nucleotidyltransferase

Guanylyltransferase

mRNA capping enzyme

Other

2.7.8: miscellaneous

Phosphatidyltransferases	CDP-diacylglycerol—glycerol-3-phosphate 3-phosphatidyltransferase CDP-diacylglycerol—serine O-phosphatidyltransferase CDP-diacylglycerol—inositol 3-phosphatidyltransferase CDP-diacylglycerol—choline O-phosphatidyltransferase
Glycosyl-1-phosphotransferase	N-acetylglucosamine-1-phosphate transferase

2.7.10-2.7.13: protein kinase
(PO₄; protein acceptor)

2.7.10: protein-tyrosine	see tyrosine kinases
2.7.11: protein-serine/threonine	see serine/threonine-specific protein kinases
2.7.12: protein-dual-specificity	see serine/threonine-specific protein kinases
2.7.13: protein-histidine	Protein-histidine pros-kinase Protein-histidine tele-kinase Histidine kinase

v t e Enzymes
Activity	Active site Binding site Catalytic triad Oxyanion hole Enzyme promiscuity Diffusion-limited enzyme Cofactor Enzyme catalysis
Regulation	Allosteric regulation Cooperativity Enzyme inhibitor Enzyme activator
Classification	EC number Enzyme superfamily Enzyme family List of enzymes
Kinetics	Enzyme kinetics Eadie–Hofstee diagram Hanes–Woolf plot Lineweaver–Burk plot Michaelis–Menten kinetics
Types	EC1 Oxidoreductases (list) EC2 Transferases (list) EC3 Hydrolases (list) EC4 Lyases (list) EC5 Isomerases (list) EC6 Ligases (list) EC7 Translocases (list)

Portal:

Biology

Category:

EC 2.7.8

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