2.5.1.17: corrinoid adenosyltransferase

This is an abbreviated version!
For detailed information about corrinoid adenosyltransferase, go to the full flat file.

Reaction

2 ATP + 2 cob(II)alamin +

Synonyms

ACAT, adenosyltransferase, vitamin B12s, aquacob(I)alamin adenosyltransferase, aquocob(I)alamin adenosyltransferase, ATP: cobalamin adenosyltransferase, ATP:co(I)rrinoid adenosyltransferase, ATP:cob(I)alamin adenosyltransferase, ATP:cob(I)alamin Cobeta-adenosyltransferase, ATP:cob(I)alamin transferase (ATR), ATP:Cob(I)alaminadenosyltransferase, ATP:cobalamin adenosyltransferase, ATP:cobalt(I) corrinoid adenosyltransferase, ATP:corrinoid adenosyltransferase, ATP:corrinoid adenosyltransferase PduO, ATR, cob(I)alamin adenosyltransferase, cob(I)yrinic acid a,c-diamide adenosyltransferase, CobA, CobA-type ATP:Co(I)rrinoid adenosyltransferase, cobalamin adenosyltransferase, CobAMm, cobO mutant SVQ336, cobO mutant SVQ524, cobO mutantSVQ336, EC 1.16.8.1, EutT, EutT adenosyltransferase, hATR, homologeous to PduO-type ATP: cob(I)alamin adenosyltransferase, human adenosyltransferase, human ATP: cob(I)alamin adenosyltransferase, human-type ACA, human-type ATP: co(I)rrinoid adenosyltransferase, human-type ATP: cob(I)alamin adenosyltransferase, LrPduO, methylmalonic aciduria type B, MMAB, MMAB protein, PduO, PduO adenosyltransferase, PduO enzyme, PduO protein, PduO-type ACA, PduO-type adenosine 5'-triphosphate:corrinoid adenosyltransferase, PduO-type ATP: cobalamin adenosyltransferase, PduO-type ATP:Co(I)rrinoid adenosyltransferase, PduO-type ATP:cob(I)alamin adenosyltransferase, PduO-type ATP:corrinoid adenosyltransferase, PduO-type corrinoid adenosyltransferase, ST1454, ST2180, TA1434, vitamin B12s adenosyltransferase

ECTree

     2 Transferases

         2.5 Transferring alkyl or aryl groups, other than methyl groups

             2.5.1 Transferring alkyl or aryl groups, other than methyl groups (only sub-subclass identified to date)

                2.5.1.17 corrinoid adenosyltransferase

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Results	in table
5	Activating Compound
39772	AA Sequence
2	Application
1	CAS Registry Number
37	Cloned(Commentary)
17	Cofactor
13	Crystallization (Commentary)
12	General Information
14	General Stability
44	Inhibitors
58	kcat/KM [mM/s]
1	Ki Value [mM]
146	KM Value [mM]
14	Localization
77	Metals/Ions
24	Molecular Weight [Da]
49	Natural Substrates/ Products (Substrates)
2	Organic Solvent Stability
65	Organism
4	Oxidation Stability
4	Pathway
56	PDB ID
25	pH Optimum
2	pH Range
138	Protein Variants
34	Purification (Commentary)
23	Reaction
7	Reaction Type
62	Reference
2	Renatured (Commentary)
5	Source Tissue
55	Specific Activity [micromol/min/mg]
8	Storage Stability
155	Substrates and Products (Substrate)
17	Subunits
122	Synonyms
1	Systematic Name
28	Temperature Optimum [°C]
1	Temperature Range [°C]
3	Temperature Stability [°C]
200	Turnover Number [1/s]

Systematic Name

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Systematic Name on EC 2.5.1.17 - corrinoid adenosyltransferase

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SYSTEMATIC NAME

IUBMB Comments

ATP:cob(II)alamin Cobeta-adenosyltransferase

The corrinoid adenosylation pathway comprises three steps: (i) reduction of Co(III) within the corrinoid to Co(II) by a one-electron transfer. This can occur non-enzymically in the presence of dihydroflavin nucleotides or reduced flavoproteins [3]. (ii) Co(II) is bound by corrinoid adenosyltransferase, resulting in displacement of the lower axial ligand by an aromatic residue. The reduction potential of the 4-coordinate Co(II) intermediate is raised by ~250 mV compared with the free compound, bringing it to within physiological range. This is followed by a second single-electron transfer from either free dihydroflavins or the reduced flavin cofactor of flavoproteins, resulting in reduction to Co(I) [7]. (iii) the Co(I) conducts a nucleophilic attack on the adenosyl moiety of ATP, resulting in transfer of the deoxyadenosyl group and oxidation of the cobalt atom to Co(III) state. Three types of corrinoid adenosyltransferases, not related by sequence, have been described. In the anaerobic bacterium Salmonella enterica they are encoded by the cobA gene (a housekeeping enzyme involved in both the de novo biosynthesis and the salvage of adenosylcobalamin), the pduO gene (involved in (S)-propane-1,2-diol utilization), and the eutT gene (involved in ethanolamine utilization). Since EutT hydrolyses triphosphate to diphosphate and phosphate during catalysis, it is classified as a separate enzyme. The mammalian enzyme belongs to the PduO type. The enzyme can act on other corrinoids, such as cob(II)inamide.