7WZC image
Entry Detail
PDB ID:
7WZC
Keywords:
Title:
An open conformation Form2 of switch II for RhoA GDP-bound state
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2022-02-17
Release Date:
2023-02-22
Method Details:
Experimental Method:
Resolution:
1.80 Å
R-Value Free:
0.26
R-Value Work:
0.20
R-Value Observed:
0.20
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Transforming protein RhoA
Chain IDs:A
Chain Length:185
Number of Molecules:1
Biological Source:Homo sapiens
Primary Citation
A RhoA structure with switch II flipped outward revealed the conformational dynamics of switch II region.
J.Struct.Biol. 215 107942 107942 (2023)
PMID: 36781028 DOI: 10.1016/j.jsb.2023.107942

Abstact

Small GTPase RhoA switches from GTP-bound state to GDP-bound state by hydrolyzing GTP, which is accelerated by GTPases activating proteins (GAPs). However, less study of RhoA structural dynamic changes was conducted during this process, which is essential for understanding the molecular mechanism of GAP dissociation. Here, we solved a RhoA structure in GDP-bound state with switch II flipped outward. Because lacking the intermolecular interactions with guanine nucleotide, we proposed this conformation of RhoA could be an intermediate after GAP dissociation. Further molecular dynamics simulations found the conformational changes of switch regions are indeed existing in RhoA and involved in the regulation of GAP dissociation and GEF recognition. Besides, the guanine nucleotide binding pocket extended to switch II region, indicating a potential "druggable" cavity for RhoA. Taken together, our study provides a deeper understanding of the dynamic properties of RhoA switch regions and highlights the direction for future drug development.

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