Cloning of a Coconut Endosperm cDNA Encoding a 1-Acyl-sn-Glycerol-3-Phosphate Acyltransferase That Accepts Medium-Chain-Length Substrates (original) (raw)

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Calgene, Inc., 1920 Fifth Street, Davis, California 95616

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Calgene, Inc., 1920 Fifth Street, Davis, California 95616

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Calgene, Inc., 1920 Fifth Street, Davis, California 95616

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Calgene, Inc., 1920 Fifth Street, Davis, California 95616

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Calgene, Inc., 1920 Fifth Street, Davis, California 95616

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Calgene, Inc., 1920 Fifth Street, Davis, California 95616

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Published:

01 November 1995

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D. S. Knutzon, K. D. Lardizabal, J. S. Nelsen, J. L. Bleibaum, H. M. Davies, J. G. Metz, Cloning of a Coconut Endosperm cDNA Encoding a 1-Acyl-sn-Glycerol-3-Phosphate Acyltransferase That Accepts Medium-Chain-Length Substrates, Plant Physiology, Volume 109, Issue 3, November 1995, Pages 999–1006, https://doi.org/10.1104/pp.109.3.999
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Abstract

Immature coconut (Cocos nucifera) endosperm contains a 1-acyl-sn-glycerol–3-phosphate acyltransferase (LPAAT) activity that shows a preference for medium-chain-length fatty acyl-coenzyme A substrates (H.M. Davies, D.J. Hawkins, J.S. Nelsen [1995] Phytochemistry 39: 989–996). Beginning with solubilized membrane preparations, we have used chromatographic separations to identify a polypeptide with an apparent molecular mass of 29 kD, whose presence in various column fractions correlates with the acyltransferase activity detected in those same fractions. Amino acid sequence data obtained from several peptides generated from this protein were used to isolate a full-length clone from a coconut endosperm cDNA library. Clone pCGN5503 contains a 1325-bp cDNA insert with an open reading frame encoding a 308-amino acid protein with a calculated molecular mass of 34.8 kD. Comparison of the deduced amino acid sequence of pCGN5503 to sequences in the data banks revealed significant homology to other putative LPAAT sequences. Expression of the coconut cDNA in Escherichia coli conferred upon those cells a novel LPAAT activity whose substrate activity profile matched that of the coconut enzyme.

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Copyright © 1995 by American Society of Plant Biologists

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