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Two novel Physcomitrella patens fatty acid elongases (ELOs): identification and functional characterization.
MedLine Citation:
PMID:  23138714     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The lower plant Physcomitrella patens synthesizes several long-chain polyunsaturated fatty acids (LC-PUFAs) by a series of desaturation and elongation reactions. In the present study, the full-length cDNAs for two novel fatty acid elongases designated PpELO1 and PpELO2 were isolated from P. patens using a PCR-based cloning strategy. These cDNAs encoding proteins of 335 and 280 amino acids with predicted molecular masses of 38.7 and 32.9 kDa, respectively, are predicted to contain seven transmembrane domains with a possible localization in the subcellular endoplasmic reticulum. Sequence comparisons and phylogenetic analysis revealed that they are closely related to other LC-PUFA elongases of the lower eukaryotes such as the Δ(5)- and Δ(6)-elongases of Marchantia polymorpha as well as the Δ(6)-elongase of P. patens. Heterologous expression of the PpELO1 in Saccharomyces cerevisiae led to the elongation of Δ(9)-, Δ(6)-C(18), and Δ(5)-C(20) LC-PUFAs, whereas only Δ(9)- and Δ(6)-C(18) LC-PUFA substrates were used by PpELO2. Chimeric proteins were constructed to identify the amino acid regions most likely to be involved in the determination of the fatty acid substrate specificity. The expression of eight chimeric proteins in yeast revealed that substitution of the C-terminal 50 amino acids from PpELO1 into PpELO2 resulted in a high specificity for C(20) fatty acid substrates. As a result, we suggest that the C-terminal region of PpELO1 is sufficient for C(20) substrate elongation. Overall, these results provide important insights into the structural basis for substrate specificity of PUFA-generating ELO enzymes.
Authors:
Pradinunt Eiamsa-Ard; Akkharawit Kanjana-Opas; Edgar B Cahoon; Pichit Chodok; Sireewan Kaewsuwan
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-11-9
Journal Detail:
Title:  Applied microbiology and biotechnology     Volume:  -     ISSN:  1432-0614     ISO Abbreviation:  Appl. Microbiol. Biotechnol.     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-11-9     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8406612     Medline TA:  Appl Microbiol Biotechnol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Department of Industrial Biotechnology, Faculty of Agro-Industry, Prince of Songkla University, Songkhla, 90112, Thailand.
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