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Engineering of chimeric class II polyhydroxyalkanoate synthases.

Nuttawee Niamsiri1, Soazig C Delamarre, Young-Rok Kim

  • 1Department of Food Science, Stocking Hall, Cornell University, Ithaca, New York 14853, USA.

Applied and Environmental Microbiology
|November 6, 2004
PubMed
Summary
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Researchers engineered novel polyhydroxyalkanoates (PHA) synthase enzymes using a combinatorial genetic strategy. Five chimeric PHA synthases showed significantly improved catalytic activity for PHA biosynthesis.

Area of Science:

  • Biotechnology
  • Enzymology
  • Polymer Science

Background:

  • Polyhydroxyalkanoates (PHAs) are biopolyesters with diverse applications.
  • PHA synthase is a critical enzyme in PHA biosynthesis.
  • Improving PHA synthase activity is key to efficient PHA production.

Purpose of the Study:

  • To engineer novel class II PHA synthases with enhanced catalytic properties.
  • To identify chimeric PHA synthases with improved in vivo activity.

Main Methods:

  • Constructed a synthetic phaC gene from Pseudomonas oleovorans.
  • Utilized a combinatorial genetic strategy involving random amplification and gene shuffling.
  • Expressed chimeric genes in a PHA-negative Ralstonia eutropha strain.
  • Screened recombinant clones for PHA production and analyzed enzyme activity.

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Main Results:

  • Five chimeric PHA synthases (S1-71, S4-8, S5-58, S3-69, S3-44) exhibited 1.3- to 3.0-fold increased in vivo activity.
  • Chimeric enzymes slightly increased the molar fraction of 3-hydroxyoctanoate in PHAs.
  • Molecular weights of PHAs remained largely unchanged.
  • Sequence analysis indicated fragments originated from Pseudomonas fluorescens and Pseudomonas aureofaciens.

Conclusions:

  • Combinatorial genetic engineering is effective for improving PHA synthase catalytic activity.
  • The identified chimeric PHA synthases offer potential for enhanced biopolymer production.
  • Structural analysis suggests surface-located amino acid substitutions are crucial for improved activity.