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CATH Superfamily 3.10.129.110

Polyketide synthase dehydratase

The name of this superfamily has been modified since the most recent official CATH+ release (v4_4_0). At the point of the last release, this superfamily was named:

"
Polyketide synthase dehydratase
".

Functional Families

Overview of the Structural Clusters (SC) and Functional Families within this CATH Superfamily. Clusters with a representative structure are represented by a filled circle.
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FunFam 3: Probable polyketide synthase pks1

There are 3 EC terms in this cluster

Please note: EC annotations are assigned to the full protein sequence rather than individual protein domains. Since a given protein can contain multiple domains, it is possible that some of the annotations below come from additional domains that occur in the same protein, but have been classified elsewhere in CATH.

Note: The search results have been sorted with the annotations that are found most frequently at the top of the list. The results can be filtered by typing text into the search box at the top of the table.

EC Term Annotations Evidence
Beta-ketoacyl-[acyl-carrier-protein] synthase I. [EC: 2.3.1.41]
Acyl-[acyl-carrier-protein] + malonyl-[acyl-carrier-protein] = 3-oxoacyl- [acyl-carrier-protein] + CO(2) + [acyl-carrier-protein].
  • Responsible for the chain-elongation step of dissociated (type II) fatty-acid biosynthesis, i.e. the addition of two C atoms to the fatty-acid chain.
  • Escherichia coli mutants that lack this enzyme are deficient in unsaturated fatty acids.
  • Can use fatty acyl thioesters of ACP (C(2) to C(16)) as substrates, as well as fatty acyl thioesters of Co-A (C(4) to C(16)).
  • The substrate specificity is very similar to that of EC 2.3.1.179 with the exception that the latter enzyme is far more active with palmitoleoyl-ACP (C(16)-Delta(9)) as substrate, allowing the organism to regulate its fatty-acid composition with changes in temperature.
 5 A0A0H3M8C2 A0A0H3M8C2 B2HIL7 Q7TXK8 Q7TXK8
Narbonolide synthase. [EC: 2.3.1.240]
Malonyl-CoA + 6 (2S)-methylmalonyl-CoA + 5 NADPH = narbonolide + 7 CoA + 7 CO(2) + 5 NADP(+) + 2 H(2)O.
  • The product, narbonolide, contains a 14-membered ring and is an intermediate in the biosynthesis of narbonomycin and pikromycin in the bacterium Streptomyces venezuelae.
  • The enzyme also produces 10-deoxymethynolide (see EC 2.3.1.239).
  • The enzyme has 29 active sites arranged in four polypeptides (pikAI - pikAIV) with a loading domain, six extension modules and a terminal thioesterase domain.
  • Each extension module contains a ketosynthase (KS), keto reductase (KR), an acyltransferase (AT) and an acyl-carrier protein (ACP).
  • Not all active sites are used in the biosynthesis.
 2 Q9ZGI4 Q9ZGI5
10-deoxymethynolide syntase. [EC: 2.3.1.239]
Malonyl-CoA + 5 (2S)-methylmalonyl-CoA + 5 NADPH = 10-deoxymethynolide + 6 CoA + 6 CO(2) + 5 NADP(+) + 2 H(2)O.
  • The product, 10-deoxymethynolide, contains a 12-membered ring and is an intermediate in the biosynthesis of methymycin in the bacterium Streptomyces venezuelae.
  • The enzyme also produces narbonolide (see EC 2.3.1.240).
  • The enzyme has 29 active sites arranged in four polypeptides (pikAI - pikAIV) with a loading domain, six extension modules and a terminal thioesterase domain.
  • Each extension module contains a ketosynthase (KS), keto reductase (KR), an acyltransferase (AT) and an acyl-carrier protein (ACP).
  • Not all active sites are used in the biosynthesis.
 2 Q9ZGI4 Q9ZGI5
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