Structure of a switchable subtilisin complexed with a substrate and with the activator azide.

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TitleStructure of a switchable subtilisin complexed with a substrate and with the activator azide.
Publication TypeJournal Article
Year of Publication2009
AuthorsD Gallagher, T, Ruan, B, London, M, Bryan, MA, Bryan, PN
JournalBiochemistry
Volume48
Issue43
Pagination10389-94
Date Published2009 Nov 3
ISSN1520-4995
KeywordsAnions, Azides, Bacillus, Bacterial Proteins, Crystallography, X-Ray, Fluorides, Kinetics, Models, Biological, Mutation, Protein Binding, Protein Structure, Secondary, Subtilisins
Abstract

An engineered variant of the protease subtilisin from Bacillus amyloliquefaciens, in which the D32A mutation renders the enzyme's activity dependent on the presence of certain small anions such as fluoride or azide, has been produced. This modified enzyme has applications as an azide or fluoride-triggered expression-purification tool. We report activity measurements showing that the enzyme is activated more than 3000-fold by azide and describe the 1.8 A resolution structure of an inactive form (by replacing the catalytic nucleophile Ser 221 with alanine) of the protease, in complex with azide and with a substrate that spans the active site. Both enzyme and substrate have been engineered to increase their stability and the affinity of their interaction. The substrate is based on a stabilized subtilisin prodomain, extended across the active site by the addition of four residues at its C-terminus. In the crystal structure, the substrate is well-ordered across the active site, and the azide anion is observed bound adjacent to Ala 32. The structures of the substrate complex in three different crystals (anion-free, fluoride-soaked, and azide-soaked) are compared. These structures provide extensive information for understanding subtilisin's substrate binding and catalytic mechanism, and for the development of biotechnology tools based on anion-activated proteolysis. The mechanism of anion-dependent proteolysis appears to be a slight modification of the accepted charge-relay mechanism for serine proteases.

DOI10.1021/bi900577n
Alternate JournalBiochemistry
PubMed ID19761257
PubMed Central IDPMC2979009
Grant ListR44 GM076786 / GM / NIGMS NIH HHS / United States