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. 1991 May 15;88(10):4114–4118. doi: 10.1073/pnas.88.10.4114

Primary structure of a cerulenin-binding beta-ketoacyl-[acyl carrier protein] synthase from barley chloroplasts.

M Siggaard-Andersen 1, S Kauppinen 1, P von Wettstein-Knowles 1
PMCID: PMC51608  PMID: 2034657

Abstract

The radioactively labeled beta-ketoacyl thioester synthase inhibitor [3H] cerulenin was used to tag three dimeric barely chloroplast proteins (alpha alpha, alpha beta, and beta beta) from the stromal fraction. Oligonucleotides corresponding to amino acid sequences obtained from the purified proteins were used to generate with the polymerase chain reaction a probe for cDNAs encoding the beta subunit. cDNA sequencing revealed an open reading frame for 462 residues comprising the mature protein and a 35-amino acid transit peptide. The deduced amino acid sequence of the mature protein is homologous to the beta-ketoacyl-[acyl carrier protein] (ACP) synthase I [3-oxoacyl-ACP synthase; acyl-ACP:malonyl-ACP C-acyltransferase (decarboxylating), EC 2.3.1.41] of Escherichia coli. Under analogous experimental conditions [3H]cerulenin tagged a single dimeric protein from spinach chloroplasts.

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Selected References

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