Proteolysis of Truncated Hemolysin A Yields a Stable Dimerization Interface

Overview

Journal Acta Crystallogr F Struct Biol Commun

Specialty Chemistry

Date 2017 Mar 15

PMID 28291749

Citations 2

Authors

Walter R P Novak

Basudeb Bhattacharyya

Daniel P Grilley

Todd M Weaver

Affiliations

Soon will be listed here.

Abstract

Wild-type and variant forms of HpmA265 (truncated hemolysin A) from Proteus mirabilis reveal a right-handed, parallel β-helix capped and flanked by segments of antiparallel β-strands. The low-salt crystal structures form a dimeric structure via the implementation of on-edge main-chain hydrogen bonds donated by residues 243-263 of adjacent monomers. Surprisingly, in the high-salt structures of two variants, Y134A and Q125A-Y134A, a new dimeric interface is formed via main-chain hydrogen bonds donated by residues 203-215 of adjacent monomers, and a previously unobserved tetramer is formed. In addition, an eight-stranded antiparallel β-sheet is formed from the flap regions of crystallographically related monomers in the high-salt structures. This new interface is possible owing to additional proteolysis of these variants after Tyr240. The interface formed in the high-salt crystal forms of hemolysin A variants may mimic the on-edge β-strand positioning used in template-assisted hemolytic activity.

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