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Effect of over-expression of phasin gene from Aeromonas hydrophila on biosynthesis of copolyesters of 3-hydroxybutyrate and 3-hydroxyhexanoate

Authors :
Tian, Shu-Jun
Lai, Wei-Jian
Zheng, Zhong
Wang, He-Xiang
Chen, Guo-Qiang
Source :
FEMS Microbiology Letters; Mar2005, Vol. 244 Issue 1, p19-25, 7p
Publication Year :
2005

Abstract

Abstract: The gene phaP<subscript>Ah</subscript>, encoding the protein phasin that is associated with poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBHHx) granule of Aeromonas hydrophila 4AK4, was cloned and characterized. Recombinant strains harboring additional copies of the phasin gene (phaP<subscript>Ah</subscript>) and the polyhydroxyalkanoate (PHA) synthase gene (phaC<subscript>Ah</subscript>) accumulated PHBHHx copolyesters consisting of 21 mol% 3-hydroxyhexanoate (3HHx) as compared to 14 mol% 3HHx produced by wild type strain. The molecular weight of PHBHHx produced by the above recombinants was lower than that obtained from the wild type strain grown under similar conditions. Over-expression of phaP<subscript>Ah</subscript> led to the production of more PHA granules but with reduced sizes. SDS–PAGE showed that PhaP<subscript>Ah</subscript> was the predominant protein present in the PHBHHx granules. The RT-PCR results suggested that phasin PhaP<subscript>Ah</subscript>, regulated phaC<subscript>Ah</subscript> gene at the transcription level. Gene PhaP<subscript>We</subscript> from Wautersia eutropha (formerly Ralstonia eutropha; encoding a 20kDa protein with low amino acid homology to the A. hydrophila 13kDa protein) cloned into A. hydrophila 4AK4 exhibited similar effects on PHBHHx production and PHBHHx composition. These data suggest that the phasins could represent a protein family possessing similar functions but different structures. [Copyright &y& Elsevier]

Details

Language :
English
ISSN :
03781097
Volume :
244
Issue :
1
Database :
Complementary Index
Journal :
FEMS Microbiology Letters
Publication Type :
Academic Journal
Accession number :
16512159
Full Text :
https://doi.org/10.1016/j.femsle.2005.01.020