The Enzyme Database

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EC 1.13.12.20     
Accepted name: noranthrone monooxygenase
Reaction: norsolorinic acid anthrone + O2 = norsolorinic acid + H2O
For diagram of aflatoxin biosynthesis (part 1), click here
Glossary: norsolorinic acid anthrone = noranthrone = 2-hexanoyl-1,3,6,8-tetrahydroxyanthracen-9(10H)-one
norsolorinate = 2-hexanoyl-1,3,6,8-tetrahydroxy-9,10-anthraquinone
Other name(s): norsolorinate anthrone oxidase
Systematic name: norsolorinic acid anthrone:oxygen 9-oxidoreductase (norsolorinic acid-forming)
Comments: Involved in the synthesis of aflatoxins in the fungus Aspergillus parasiticus.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc
References:
1.  Ehrlich, K.C., Li, P., Scharfenstein, L. and Chang, P.K. HypC, the anthrone oxidase involved in aflatoxin biosynthesis. Appl. Environ. Microbiol. 76 (2010) 3374–3377. [DOI] [PMID: 20348292]
[EC 1.13.12.20 created 2013]
 
 
EC 2.3.1.221     
Accepted name: noranthrone synthase
Reaction: 7 malonyl-CoA + hexanoyl-[acyl-carrier protein] = 7 CoA + norsolorinic acid anthrone + [acyl-carrier protein] + 7 CO2 + 2 H2O
For diagram of polyketides biosynthesis, click here
Glossary: norsolorinic acid anthrone = noranthrone = 2-hexanoyl-1,3,6,8-tetrahydroxyanthracen-9(10H)-one
Other name(s): polyketide synthase A (ambiguous); PksA (ambiguous); norsolorinic acid anthrone synthase
Systematic name: malonyl-CoA:hexanoate malonyltransferase (norsolorinic acid anthrone-forming)
Comments: A multi-domain polyketide synthase involved in the synthesis of aflatoxins in the fungus Aspergillus parasiticus. The hexanoyl starter unit is provided to the acyl-carrier protein (ACP) domain by a dedicated fungal fatty acid synthase [1].
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc
References:
1.  Crawford, J.M., Thomas, P.M., Scheerer, J.R., Vagstad, A.L., Kelleher, N.L. and Townsend, C.A. Deconstruction of iterative multidomain polyketide synthase function. Science 320 (2008) 243–246. [DOI] [PMID: 18403714]
2.  Crawford, J.M., Korman, T.P., Labonte, J.W., Vagstad, A.L., Hill, E.A., Kamari-Bidkorpeh, O., Tsai, S.C. and Townsend, C.A. Structural basis for biosynthetic programming of fungal aromatic polyketide cyclization. Nature 461 (2009) 1139–1143. [DOI] [PMID: 19847268]
3.  Korman, T.P., Crawford, J.M., Labonte, J.W., Newman, A.G., Wong, J., Townsend, C.A. and Tsai, S.C. Structure and function of an iterative polyketide synthase thioesterase domain catalyzing Claisen cyclization in aflatoxin biosynthesis. Proc. Natl. Acad. Sci. USA 107 (2010) 6246–6251. [DOI] [PMID: 20332208]
[EC 2.3.1.221 created 2013]
 
 


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