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Fatty acid synthesis enzyme clans.

Ngoc N Phan1, Yuen Keong Lee, Peter J Reilly

  • 1Department of Chemical and Biological Engineering, Iowa State University, Ames, IA, 50011-2230, USA.

Biotechnology Letters
|September 27, 2014
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Summary
This summary is machine-generated.

Researchers identified enzyme clans within fatty acid and polyketide synthesis. This classification reveals distant evolutionary relationships between ketoacyl reductases and hydroxyacyl dehydratases, impacting enzyme family understanding.

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Area of Science:

  • Biochemistry and Molecular Biology
  • Enzymology
  • Structural Biology

Background:

  • Fatty acid and polyketide synthesis involves key enzymes: ketoacyl reductases (KRs), hydroxyacyl dehydratases (HDs), and enoyl reductases (ERs).
  • Previous classification grouped these enzymes into 4 KR, 8 HD, and 5 ER families based on statistical criteria.
  • Structural analysis revealed Rossmann folds in KR and some ER families, and HotDog folds in HD family members.

Purpose of the Study:

  • To investigate potential distant evolutionary relationships between enzyme families based on structural similarities.
  • To define enzyme clans by integrating structural fold information with sequence-based classifications.
  • To explore the evolutionary connections between ketoacyl reductases, hydroxyacyl dehydratases, and enoyl reductases.

Main Methods:

  • Utilized manual inspection and statistical tests to analyze enzyme structures and sequences.
  • Compared protein structural folds (Rossmann and HotDog) across different enzyme families.
  • Integrated structural data with existing family classifications to identify potential enzyme clans.

Main Results:

  • Defined two enzyme clans encompassing three of the four KR families and two of the eight HD families.
  • Identified a relationship between one ER family and the defined KR clan.
  • Demonstrated that enzymes with similar folds across different families may belong to the same clan, indicating distant homology.

Conclusions:

  • The study successfully defined enzyme clans for KRs and HDs, revealing deeper evolutionary connections.
  • Structural fold similarities are crucial indicators of distant relationships, even in the absence of direct sequence homology.
  • This clan-based classification refines our understanding of the evolution and relationships within fatty acid and polyketide synthesis enzyme superfamilies.