6VJF image
Deposition Date 2020-01-15
Release Date 2020-02-19
Last Version Date 2023-10-11
Entry Detail
PDB ID:
6VJF
Keywords:
Title:
The P-Loop K to A mutation of C. therm Vps1 GTPase-BSE
Biological Source:
Method Details:
Experimental Method:
Resolution:
2.47 Å
R-Value Free:
0.23
R-Value Work:
0.18
R-Value Observed:
0.19
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Putative sorting protein Vps1
Gene (Uniprot):CTHT_0061810
Mutations:K58A
Chain IDs:A, B, C, D
Chain Length:391
Number of Molecules:4
Biological Source:Chaetomium thermophilum (strain DSM 1495 / CBS 144.50 / IMI 039719)
Primary Citation
Structural and functional characterization of the dominant negative P-loop lysine mutation in the dynamin superfamily protein Vps1.
Protein Sci. 29 1416 1428 (2020)
PMID: 31981262 DOI: 10.1002/pro.3830

Abstact

Dynamin-superfamily proteins (DSPs) are large self-assembling mechanochemical GTPases that harness GTP hydrolysis to drive membrane remodeling events needed for many cellular processes. Mutation to alanine of a fully conserved lysine within the P-loop of the DSP GTPase domain results in abrogation of GTPase activity. This mutant has been widely used in the context of several DSPs as a dominant-negative to impair DSP-dependent processes. However, the precise deficit of the P-loop K to A mutation remains an open question. Here, we use biophysical, biochemical and structural approaches to characterize this mutant in the context of the endosomal DSP Vps1. We show that the Vps1 P-loop K to A mutant binds nucleotide with an affinity similar to wild type but exhibits defects in the organization of the GTPase active site that explain the lack of hydrolysis. In cells, Vps1 and Dnm1 bearing the P-loop K to A mutation are defective in disassembly. These mutants become trapped in assemblies at the typical site of action of the DSP. This work provides mechanistic insight into the widely-used DSP P-loop K to A mutation and the basis of its dominant-negative effects in the cell.

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