PMID: 20054121 , Related PDB ids: 2WL7, R2WL7SF

Authors:

Fiorentini M, Nielsen AK, Kristensen O, Kastrup JS, Gajhede M

Title:

Structure of the first PDZ domain of human PSD-93.

Journal:

Acta Crystallogr Sect F Struct Biol Cryst Commun. 2009 Dec 1;65(Pt, 12):1254-7. Epub 2009 Nov 27.

Abstract:

The crystal structure of the PDZ1 domain of human PSD-93 has been determined to 2.0 A resolution. The PDZ1 domain forms a crystallographic trimer that is also predicted to be stable in solution. The main contributions to the stabilization of the trimer seem to arise from interactions involving the PDZ1-PDZ2 linker region at the extreme C-terminus of PDZ1, implying that the oligomerization that is observed is not of biological significance in full-length PSD-93. Comparison of the structures of the binding cleft of PSD-93 PDZ1 with the previously reported structures of PSD-93 PDZ2 and PDZ3 as well as of the closely related human PSD-95 PDZ1 shows that they are very similar in terms of amino-acid composition. However, the cleft is significantly narrower in PSD-95. This could be part of the basis of peptide selectivity between PSD-93 PDZ1 and PSD-95 PDZ1.