Cryo-electron microscopy reveals the membrane insertion mechanism of V. cholerae hemolysin.

Abstract:

:Vibrio cholerae hemolysin (HlyA) is a 65 kDa pore-forming toxin which causes lysis of target eukaryotic cells by forming heptameric channels in the plasma membrane. Deletion of the 15 kDa C-terminus β-prism carbohydrate-binding domain generates a 50 kDa truncated variant (HlyA50) with 1000-fold-reduced pore-forming activity. Previously, we showed by cryo-electron microscopy that the two toxin oligomers have central channels, but the 65 kDa toxin oligomer is a seven-fold symmetric structure with bowl-, ring-, and arm-like domains, whereas the 50 kDa oligomer is an asymmetric jar-like heptamer. In the present study, we determined three-dimensional(3D) structures of HlyA and HlyA50 in presence of erythrocyte stroma and observed that interaction of the 65 kDa toxin with the stroma induced a significant decrease in the height of the β-barrel oligomer with a change in conformation of the ring- and arm-like domains of HlyA. These features were absent in interaction of HlyA50 with stroma. We propose that this conformational transition is critical for membrane-insertion of the toxin.

journal_name

J Biomol Struct Dyn

authors

Dutta S,Banerjee KK,Ghosh AN

doi

10.1080/07391102.2013.823564

subject

Has Abstract

pub_date

2014-01-01 00:00:00

pages

1434-42

issue

9

eissn

0739-1102

issn

1538-0254

journal_volume

32

pub_type

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