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spinqualitylabelsall models 1r64, resolution 2.20Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image

The 2.2 A crystal structure of Kex2 protease in complex with Ac-Arg-Glu-Lys-boroArg peptidyl boronic acid inhibitor

Overview

Kex2 is the yeast prototype of a large family of serine proteases that are highly specific for cleavage of their peptide substrates C-terminal to paired basic sites. This paper reports the 2.2 A resolution crystal structure of ssKex2 in complex with an Ac-Arg-Glu-Lys-Arg peptidyl boronic acid inhibitor (R = 19.7, R(free) = 23.4). By comparison of this structure with the structure of the mammalian homologue furin [Henrich, S., et al. (2003) Nat. Struct. Biol. 10, 520-526], we suggest a structural basis for the differences in substrate recognition at the P(2) and P(4) positions between Kex2 and furin and provide a structural rationale for the lack of P(6) recognition in Kex2. In addition, several monovalent cation binding sites are identified, and a mechanism of activation of Kex2 by potassium ion is proposed.

About this Structure

1R64 is a Single protein structure of sequence from Saccharomyces cerevisiae with , , , and as ligands. Active as Kexin, with EC number 3.4.21.61 Full crystallographic information is available from OCA.

Reference

Structural basis for differences in substrate selectivity in Kex2 and furin protein convertases., Holyoak T, Kettner CA, Petsko GA, Fuller RS, Ringe D, Biochemistry. 2004 Mar 9;43(9):2412-21. PMID:14992578

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