Succinyl-CoA

(Redirected from Succinyl CoA)

Succinyl-coenzyme A, abbreviated as succinyl-CoA (/ˌsʌksɪnəlˌkˈ/) or SucCoA, is a thioester of succinic acid and coenzyme A.

Succinyl-CoA
Names
IUPAC name
4-[(2-{3-[(2R)-4-{[1,3-Dihydroxy-1,3-dioxo-3-(3′-O-phosphonoadenosin-5′-O-yl)-1λ5,3λ5-diphosphoxan-1-yl]oxy}-3,3-dimethylbutanamido]propanamido}ethyl)sulfanyl]-4-oxobutanoic acid
Systematic IUPAC name
(9R)-1-[(2R,3S,4R,5R)-5-(6-Amino-9H-purin-9-yl)-4-hydroxy-3-(phosphonooxy)oxolan-2-yl]-3,5,9-trihydroxy-8,8-dimethyl-3,5,10,14,19-pentaoxo-2,4,6-trioxa-18-thia-11,15-diaza-3λ5,5λ5-diphosphadocosan-22-oic acid
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
ECHA InfoCard 100.009.163 Edit this at Wikidata
MeSH succinyl-coenzyme+A
UNII
  • InChI=1S/C25H40N7O19P3S/c1-25(2,20(38)23(39)28-6-5-14(33)27-7-8-55-16(36)4-3-15(34)35)10-48-54(45,46)51-53(43,44)47-9-13-19(50-52(40,41)42)18(37)24(49-13)32-12-31-17-21(26)29-11-30-22(17)32/h11-13,18-20,24,37-38H,3-10H2,1-2H3,(H,27,33)(H,28,39)(H,34,35)(H,43,44)(H,45,46)(H2,26,29,30)(H2,40,41,42)/t13-,18-,19-,20+,24-/m1/s1 checkY
    Key: VNOYUJKHFWYWIR-ITIYDSSPSA-N checkY
  • InChI=1/C25H40N7O19P3S/c1-25(2,20(38)23(39)28-6-5-14(33)27-7-8-55-16(36)4-3-15(34)35)10-48-54(45,46)51-53(43,44)47-9-13-19(50-52(40,41)42)18(37)24(49-13)32-12-31-17-21(26)29-11-30-22(17)32/h11-13,18-20,24,37-38H,3-10H2,1-2H3,(H,27,33)(H,28,39)(H,34,35)(H,43,44)(H,45,46)(H2,26,29,30)(H2,40,41,42)/t13-,18-,19-,20+,24-/m1/s1
    Key: VNOYUJKHFWYWIR-ITIYDSSPBJ
  • O=C(O)CCC(=O)SCCNC(=O)CCNC(=O)[C@H](O)C(C)(C)COP(=O)(O)OP(=O)(O)OC[C@H]3O[C@@H](n2cnc1c(ncnc12)N)[C@H](O)[C@@H]3OP(=O)(O)O
Properties
C25H40N7O19P3S
Molar mass 867.608
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
☒N verify (what is checkY☒N ?)

Sources

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It is an important intermediate in the citric acid cycle, where it is synthesized from α-ketoglutarate by α-ketoglutarate dehydrogenase through decarboxylation. During the process, coenzyme A is added.

With B12 as an enzymatic cofactor, it is also synthesized from propionyl CoA, the odd-numbered fatty acid, which cannot undergo beta-oxidation.[1] Propionyl-CoA is carboxylated to D-methylmalonyl-CoA, isomerized to L-methylmalonyl-CoA, and rearranged to yield succinyl-CoA via a vitamin B12-dependent enzyme. While Succinyl-CoA is an intermediate of the citric acid cycle, it cannot be readily incorporated there because there is no net consumption of Succinyl-CoA. Succinyl-CoA is first converted to malate, and then to pyruvate where it is then transported to the matrix to enter the citric acid cycle.

Fate

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It is converted into succinate through the hydrolytic release of coenzyme A by succinyl-CoA synthetase (succinate thiokinase).

Another fate of succinyl-CoA is porphyrin synthesis, where succinyl-CoA and glycine are combined by ALA synthase to form δ-aminolevulinic acid (dALA). This process is the committed step in the biosynthesis of porfobilinogen and thus hemoglobin.

Formation

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Succinyl CoA can be formed from methylmalonyl CoA through the utilization of deoxyadenosyl-B12 (deoxyadenosylcobalamin) by the enzyme methylmalonyl-CoA mutase. This reaction, which requires vitamin B12 as a cofactor, is important in the catabolism of some branched-chain amino acids as well as odd-chain fatty acids.

Interactive pathway map

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Click on genes, proteins and metabolites below to link to respective articles. [§ 1]

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|alt=TCACycle_WP78 edit]]
TCACycle_WP78 edit
  1. ^ The interactive pathway map can be edited at WikiPathways: "TCACycle_WP78".

References

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  1. ^ Halarnkar PP, Blomquist GJ (1989). "Comparative aspects of propionate metabolism". Comp. Biochem. Physiol. B. 92 (2): 227–31. doi:10.1016/0305-0491(89)90270-8. PMID 2647392.