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A Stable Miniature Protein with Oxaloacetate Decarboxylase Activity

Weston, Chris J., Cureton, Charly H., Calvert, Melanie J., Smart, Oliver S. and Allemann, Rudolf Konrad 2004. A Stable Miniature Protein with Oxaloacetate Decarboxylase Activity. ChemBioChem 5 (8) , pp. 1075-1080. 10.1002/cbic.200300805

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Abstract

An 18-residue miniature enzyme, Apoxaldie-1, has been designed, based on the known structure of the neurotoxic peptide apamin. Three lysine residues were introduced on the solvent-exposed face of the apamin -helix to serve as an active site for decarboxylation of oxaloacetate. The oxidised form of Apoxaldie-1, in which two disulfide bonds stabilise the -helix, formed spontaneously. CD spectroscopy measurements revealed that, in its oxidised form, Apoxaldie-1 adopted a stably folded structure, which was lost upon reduction of the disulfide bonds. Despite its small size and the absence of a designed binding pocket, Apoxaldie-1 displayed saturation kinetics in its oxidised form and catalysed the decarboxylation of oxaloacetate at a rate that was almost four orders of magnitude faster than that observed with n-butylamine. This rivals the performance of the best synthetic oxaloacetate decarboxylases reported to date. Unlike those, however, Apoxaldie-1 displayed significant stability. It maintained its secondary structure at temperatures in excess of 75 °C, in the presence of high concentrations of guanidinium chloride and at pH values as low as 2.2. Apamin-based catalysts have potential for the generation of miniature peptides that display activity under nonphysiological conditions.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Subjects: Q Science > QD Chemistry
Uncontrolled Keywords: chemical catalysis; peptides; protein design; RNA; stability; structure
Publisher: Wiley-Blackwell
ISSN: 1439-4227
Last Modified: 04 Jun 2017 02:54
URI: http://orca.cf.ac.uk/id/eprint/13484

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