cDNA cloning of Brassica napus malonyl‐CoA:ACP transacylase (MCAT) (fab D) and complementation of an E. coli MCAT mutant

FEBS Letters

Simon, J.W.¹  Slabas, A.R.¹ 

[1] Lipid Molecular Biology Group, Department of Biological Sciences, University of Durham, Science Laboratories, South Road, Durham, DH1 3LE, UK

关键词: Fatty acid synthetase;    Malonyl CoA:ACP transacylase:fab D;    Brassica napus;    ACP;    acyl carrier protein;    MCAT;    malonyl CoA:ACP transacylase;    FAS;    fatty acid synthetase;    PCR;    polymerase chain reaction;   

DOI  :  10.1016/S0014-5793(98)01055-2

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

The GenBank database was searched using the E. coli malonyl CoA:ACP transacylase (MCAT) sequence, for plant protein/cDNA sequences corresponding to MCAT, a component of plant fatty acid synthetase (FAS), for which the plant cDNA has not been isolated. A 272-bp Zea mays EST sequence (GenBank accession number: AA030706) was identified which has strong homology to the E. coli MCAT. A PCR derived cDNA probe from Zea mays was used to screen a Brassica napus (rape) cDNA library. This resulted in the isolation of a 1200-bp cDNA clone which encodes an open reading frame corresponding to a protein of 351 amino acids. The protein shows 47% homology to the E. coli MCAT amino acid sequence in the coding region for the mature protein. Expression of a plasmid (pMCATrap2) containing the plant cDNA sequence in Fab D89, an E. coli mutant, in MCAT activity restores growth demonstrating functional complementation and direct function of the cloned cDNA. This is the first functional evidence supporting the identification of a plant cDNA for MCAT.

【 授权许可】

Unknown