Cloning, nucleotide sequence, and expression of the Escherichia coli fabD gene, encoding malonyl coenzyme A-acyl carrier protein transacylase.
The Escherichia coli fabD gene encoding malonyl coenzyme A-acyl carrier protein transacylase (MCT) was cloned by complementation of a thermosensitive E. coli fabD mutant (fabD89). Expression of the fabD gene in an appropriate E. coli expression vector resulted in an accumulation of the MCT protein of up to 10% of total soluble protein, which was accompanied by an approximately 1,000-fold increase in the MCT activity. DNA sequence analysis and expression studies revealed that the fabD gene is part of an operon consisting of at least three genes involved in fatty acid biosynthesis. Comparison with available DNA and protein data bases suggest that a 3-ketoacyl-acyl carrier protein synthase and a ketoacyl-acyl carrier protein reductase gene are located immediately upstream and downstream, respectively, of fabD within this fab operon. Western immunoblot analysis with antiserum raised against wild-type E. coli MCT showed that the fabD89 allele encodes a polypeptide with an apparent molecular weight of 27,000 in addition to the normal MCT protein of 32,000. The nature of the temperature-sensitive fabD89 gene product is discussed.
Verwoert
I I
II
Department of Genetics, Vrije Universiteit, Amsterdam, The Netherlands.
Verbree
E C
EC
van der Linden
K H
KH
Nijkamp
H J
HJ
Stuitje
A R
AR
D064431:3-Oxoacyl-(Acyl-Carrier-Protein) Reductase; D051080:Acyl-Carrier Protein S-Malonyltransferase; D000217:Acyltransferases / Q000096:biosynthesis / Q000235:genetics*; D000429:Alcohol Oxidoreductases / Q000235:genetics; D000483:Alleles; D000595:Amino Acid Sequence; D001483:Base Sequence; D003001:Cloning, Molecular; D004926:Escherichia coli / Q000235:genetics*; D029968:Escherichia coli Proteins; D054889:Fatty Acid Synthase, Type II; D064429:Fatty Acid Synthases / Q000235:genetics*; D005816:Genetic Complementation Test; D008969:Molecular Sequence Data; D009876:Operon / Q000235:genetics; D010770:Phosphotransferases / Q000235:genetics; D011994:Recombinant Proteins / Q000096:biosynthesis; D012689:Sequence Homology, Nucleic Acid; D017855:Transferases (Other Substituted Phosphate Groups)
D029968:Escherichia coli Proteins; D011994:Recombinant Proteins; D000429:Alcohol Oxidoreductases; D064431:3-Oxoacyl-(Acyl-Carrier-Protein) Reductase; D000217:Acyltransferases; D051080:Acyl-Carrier Protein S-Malonyltransferase; C494968:fabD protein, E coli; D064429:Fatty Acid Synthases; D010770:Phosphotransferases; D017855:Transferases (Other Substituted Phosphate Groups); C021364:holo-(acyl-carrier-protein) synthase; D054889:Fatty Acid Synthase, Type II