skip to main content

DOE PAGESDOE PAGES

This content will become publicly available on April 1, 2019

Title: Structures of the fungal dynamin-related protein Vps1 reveal a unique, open helical architecture

Dynamin-related proteins (DRPs) are large multidomain GTPases required for diverse membrane-remodeling events. DRPs self-assemble into helical structures, but how these structures are tailored to their cellular targets remains unclear. We demonstrate that the fungal DRP Vps1 primarily localizes to and functions at the endosomal compartment. We present crystal structures of a Vps1 GTPase–bundle signaling element (BSE) fusion in different nucleotide states to capture GTP hydrolysis intermediates and concomitant conformational changes. Using cryoEM, we determined the structure of full-length GMPPCP-bound Vps1. The Vps1 helix is more open and flexible than that of dynamin. This is due to further opening of the BSEs away from the GTPase domains. A novel interface between adjacent GTPase domains forms in Vps1 instead of the contacts between the BSE and adjacent stalks and GTPase domains as seen in dynamin. Disruption of this interface abolishes Vps1 function in vivo. Hence, Vps1 exhibits a unique helical architecture, highlighting structural flexibilities of DRP self-assembly.
Authors:
ORCiD logo ; ORCiD logo ; ; ; ORCiD logo ; ORCiD logo ; ORCiD logo ; ORCiD logo
Publication Date:
Grant/Contract Number:
W-31-109-Eng-38
Type:
Published Article
Journal Name:
Journal of Cell Biology
Additional Journal Information:
Related Information: CHORUS Timestamp: 2018-08-07 11:26:19; Journal ID: ISSN 0021-9525
Publisher:
Rockefeller University Press
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
OSTI Identifier:
1463214