X-ray crystallographic studies on butyryl-ACP reveal flexibility of the structure around a putative acyl chain binding site

Anna Roujeinikova, Clair Baldock, William J. Simon, John Gilroy, Patrick J. Baker, Antoine R. Stuitje, David W. Rice, Antoni R. Slabas, John B. Rafferty

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100 Citations (Scopus)

Abstract

Acyl carrier protein (ACP) is an essential cofactor in biosynthesis of fatty acids and many other reactions that require acyl transfer steps. We have determined the first crystal structures of an acylated form of ACP from E. coli, that of butyryl-ACP. Our analysis of the molecular surface of ACP reveals a plastic hydrophobic cavity in the vicinity of the phosphopantethylated Ser36 residue that is expanded and occupied by the butyryl and β-mercaptoethylamine moieties of the acylated 4′-phosphopantetheine group in one of our crystal forms. In the other form, the cavity is contracted, and we propose that the protein has adopted the conformation after delivery of substrate into the active site of a partner enzyme.

Original languageEnglish
Pages (from-to)825-835
Number of pages11
JournalStructure
Volume10
Issue number6
DOIs
Publication statusPublished - 2002
Externally publishedYes

Keywords

  • Acyl carrier protein
  • Acyl chain binding
  • Binding pocket
  • Conformational changes
  • Crystal structure
  • Fatty acid biosynthesis

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