Primary Citation of Related Structures: 1MFG, 1MFL
PubMed Abstract:
Erbin contains a class I PDZ domain that binds to the C-terminal region of the receptor tyrosine kinase ErbB2, a class II ligand. The crystal structure of the human Erbin PDZ bound to the peptide EYLGLDVPV corresponding to the C-terminal residues 1247-1255 of human ErbB2 has been determined at 1 ...
Erbin contains a class I PDZ domain that binds to the C-terminal region of the receptor tyrosine kinase ErbB2, a class II ligand. The crystal structure of the human Erbin PDZ bound to the peptide EYLGLDVPV corresponding to the C-terminal residues 1247-1255 of human ErbB2 has been determined at 1.25-A resolution. The Erbin PDZ deviates from the canonical PDZ fold in that it contains a single alpha-helix. The isopropyl group of valine at position -2 of the ErbB2 peptide interacts with the Erbin Val(1351) and displaces the peptide backbone away from the alpha-helix, elucidating the molecular basis of class II ligand recognition by a class I PDZ domain. Strikingly, the phenolic ring of tyrosine -7 enters into a pocket formed by the extended beta 2-beta 3 loop of the Erbin PDZ. Phosphorylation of tyrosine -7 abolishes this interaction but does not affect the binding of the four C-terminal peptidic residues to PDZ, as revealed by the crystal structure of the Erbin PDZ complexed with a phosphotyrosine-containing ErbB2 peptide. Since phosphorylation of tyrosine -7 plays a critical role in ErbB2 function, the selective binding and sequestration of this residue in its unphosphorylated state by the Erbin PDZ provides a novel mechanism for regulation of the ErbB2-mediated signaling and oncogenicity.
Related Citations:
BIN: A BASOLATERAL PDZ PROTEIN THAT INTERACTS
WITH THE MAMMALIAN ERBB2/HER2 RECEPTOR BORG, J.P., MARCHETTO, S., LEBIVIC, A., OLLENDORFF, V., JAULIN-BASTARD, F., SAITO, H., FOURNIER, E., ADELAIDE, J., MARGOLIS, B., BIRNBAUM, D. (2000) Nat Cell Biol 2: 407
THE ERBIN PDZ DOMAIN BINDS WITH HIGH AFFINITY AND
SPECIFICITY TO THE CARBOXYL TERMINI OF DELTA-CATENIN AND ARVCF LAURA, R.P., WITT, A.S., HELD, H.A., GERSTNER, R., DESHAYES, K., KOEHLER, M.F., KOSIK, K.S., SIDHU, S.S., LASKY, L.A. (2002) J Biol Chem 277: 12906
ERBIN IS A PROTEIN CONCENTRATED AT POSTSYNAPTIC
MEMBRANES THAT INTERACTS WITH PSD-95 HUANG, Y.Z., WANG, Q., XIONG, W.C., MEI, L. (2001) J Biol Chem 276: 19318
THE ERBB2/HER2 RECEPTOR DIFFERENTIALLY INTERACTS
WITH ERBIN AND PICK1 PSD-95/DLG/ZO-1 DOMAIN
PROTEINS JAULIN-BASTARD, F., SAITO, H., LEBIVIC, A., OLLENDORFF, V., MARCHETTO, S., BIRNBAUM, D., BORG, J.P. (2001) J Biol Chem 276: 15256
Organizational Affiliation:
Molecular Medicine Laboratory and Macromolecular Crystallography Unit, Division of Experimental Medicine, Harvard Institutes of Medicine, Harvard Medical School, Boston, Massachusetts 02115, USA.
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