The Enzyme Database

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EC 1.2.1.76     
Accepted name: succinate-semialdehyde dehydrogenase (acylating)
Reaction: succinate semialdehyde + CoA + NADP+ = succinyl-CoA + NADPH + H+
For diagram of the 3-hydroxypropanoate/4-hydroxybutanoate cycle and dicarboxylate/4-hydroxybutanoate cycle in archaea, click here
Other name(s): succinyl-coA reductase; coenzyme-A-dependent succinate-semialdehyde dehydrogenase
Systematic name: succinate semialdehyde:NADP+ oxidoreductase (CoA-acylating)
Comments: Catalyses the NADPH-dependent reduction of succinyl-CoA to succinate semialdehyde. The enzyme has been described in Clostridium kluyveri, where it participates in succinate fermentation [1], and in Metallosphaera sedula, where it participates in the 3-hydroxypropanonate/4-hydroxybutanoate cycle, an autotrophic CO2 fixation pathway found in some thermoacidophilic archaea [2,3].
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc
References:
1.  Sohling, B. and Gottschalk, G. Purification and characterization of a coenzyme-A-dependent succinate-semialdehyde dehydrogenase from Clostridium kluyveri. Eur. J. Biochem. 212 (1993) 121–127. [PMID: 8444151]
2.  Alber, B., Olinger, M., Rieder, A., Kockelkorn, D., Jobst, B., Hugler, M. and Fuchs, G. Malonyl-coenzyme A reductase in the modified 3-hydroxypropionate cycle for autotrophic carbon fixation in archaeal Metallosphaera and Sulfolobus spp. J. Bacteriol. 188 (2006) 8551–8559. [PMID: 17041055]
3.  Berg, I.A., Kockelkorn, D., Buckel, W. and Fuchs, G. A 3-hydroxypropionate/4-hydroxybutyrate autotrophic carbon dioxide assimilation pathway in Archaea. Science 318 (2007) 1782–1786. [PMID: 18079405]
[EC 1.2.1.76 created 2009]
 
 


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