1gq4
STRUCTURAL DETERMINANTS OF THE NHERF INTERACTION WITH BETA2AR AND PDGFR
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OverviewOverview
The Na(+)/H(+) exchanger regulatory factor (NHERF) binds through its PDZ1, domain to the carboxyl-terminal sequences NDSLL and EDSFL of the beta(2), adrenergic receptor (beta(2)AR) and platelet-derived growth factor, receptor, respectively, and plays a critical role in the membrane, localization and physiological regulation of these receptors. The crystal, structures of the human NHERF PDZ1 domain bound to the sequences NDSLL and, EDSFL have been determined at 1.9- and 2.2-A resolution, respectively. The, beta(2)AR and platelet-derived growth factor receptor ligands insert into, the PDZ1 binding pocket by a beta-sheet augmentation process and are, stabilized by largely similar networks of hydrogen bonds and hydrophobic, contacts. In the PDZ1-beta(2)AR complex, the side chain of asparagine at, position -4 in the beta(2)AR peptide forms two additional hydrogen bonds, with Gly(30) of PDZ1, which contribute to the higher affinity of this, interaction. Remarkably, both complexes are further stabilized by, hydrophobic interactions involving the side chains of the penultimate, amino acids of the peptide ligands, whereas the PDZ1 residues Asn(22) and, Glu(43) undergo conformational changes to accommodate these side chains., These results provide structural insights into the mechanisms by which, different side chains at the position -1 of peptide ligands interact with, PDZ domains and contribute to the affinity of the PDZ-ligand interaction.
DiseaseDisease
Known diseases associated with this structure: Asthma, nocturnal, susceptibility to OMIM:[109690], Beta-2-adrenoreceptor agonist, reduced response to OMIM:[109690], Obesity, susceptibility to OMIM:[109690]
About this StructureAbout this Structure
1GQ4 is a Single protein structure of sequence from Homo sapiens with CL as ligand. Full crystallographic information is available from OCA.
ReferenceReference
Structural determinants of the Na+/H+ exchanger regulatory factor interaction with the beta 2 adrenergic and platelet-derived growth factor receptors., Karthikeyan S, Leung T, Ladias JA, J Biol Chem. 2002 May 24;277(21):18973-8. Epub 2002 Mar 6. PMID:11882663
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