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Title: Secondary PDZ domain-binding site on class B plexins enhances the affinity for PDZ–RhoGEF

Journal Article · · Proceedings of the National Academy of Sciences of the United States of America

PDZ domains are abundant protein interaction modules and typically recognize a short motif at the C terminus of their ligands, with a few residues in the motif endowing the binding specificity. The sequence-based rules, however, cannot fully account for the specificity between the vast number of PDZ domains and ligands in the cell. Plexins are transmembrane receptors that regulate processes such as axon guidance and angiogenesis. Two related guanine nucleotide exchange factors (GEFs), PDZ–RhoGEF and leukemia-associated RhoGEF (LARG), use their PDZ domains to bind class B plexins and play critical roles in signaling. Here, we present the crystal structure of the full-length cytoplasmic region of PlexinB2 in complex with the PDZ domain of PDZ–RhoGEF. The structure reveals that, in addition to the canonical C-terminal motif/PDZ interaction, the 3D domain of PlexinB2 forms a secondary interface with the PDZ domain. Our biophysical and cell-based assays show that the secondary interface contributes to the specific interaction between plexin and PDZ–RhoGEF and to signaling by plexin in the cell. As a result, formation of secondary interfaces may be a general mechanism for increasing affinity and specificity of modular domain-mediated interactions.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
National Institutes of Health (NIH); Welch Foundation; USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
GM088197; GM031954; GM008203; AC02-06CH11357
OSTI ID:
1234752
Journal Information:
Proceedings of the National Academy of Sciences of the United States of America, Vol. 112, Issue 48; ISSN 0027-8424
Publisher:
National Academy of SciencesCopyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 11 works
Citation information provided by
Web of Science

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Cited By (3)

Ligand binding to the PDZ domains of postsynaptic density protein 95 journal March 2016
Structure function relations in PDZ-domain-containing proteins: Implications for protein networks in cellular signalling journal December 2017
Regulation of the endosomal SNX27-retromer by OTULIN journal September 2019

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