Abstract
Acetyl-coenzyme A carboxylase (ACCase) catalyzes the formation of malonyl-coenzyme A, which is used in the plastid for fatty acid synthesis and in the cytosol for several pathways including fatty acid elongation and flavonoid synthesis. Two overlapping Arabidopsis genomic clones were isolated and sequenced to determine the entire ACCase-coding region. Thirty introns with an average size of 94 bp were identified by comparison with an alfalfa ACCase cDNA sequence. The 10-kb Arabidopsis ACCase gene encodes a 251-kD polypeptide, which has 80% amino acid sequence identity with alfalfa ACCase and about 40% identity with ACCase of rat, chicken, yeast, and the diatom Cyclotella. No chloroplast transit peptide sequence was observed, suggesting that this Arabidopsis gene encodes a cytosolic ACCase isozyme. ACCase gene transcripts were detected by RNase protection assays in Arabidopsis root, leaf, silique, and seed. Genomic DNA blot analysis revealed the presence of a second related Arabidopsis ACCase gene.
MeSH Terms
Acetyl-CoA Carboxylase/genetics
Amino Acid Sequence
Animals
Arabidopsis/enzymology,genetics
Chromosome Mapping
Cytosol/enzymology
DNA, Complementary/genetics
Gene Expression
Genes, Plant
Isoenzymes/genetics
Medicago sativa/enzymology,genetics
Molecular Sequence Data
Multigene Family
Rats
Sequence Homology, Amino Acid
Species Specificity
Chemicals
DNA, Complementary
Isoenzymes
Acetyl-CoA Carboxylase
Authors & Affiliations
3 authors, click to expand affiliations / ORCID
Roesler K R
Department of Botany and Plant Pathology, Michigan State University, East Lansing 48824.
Shorrosh B S
Ohlrogge J B
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