Journal
BIOLOGICAL CHEMISTRY
Volume 388, Issue 6, Pages 611-615Publisher
WALTER DE GRUYTER GMBH
DOI: 10.1515/BC.2007.075
Keywords
competition; Hck; HIV; Nef; NMR; protein-peptide interaction; SH3
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We studied the interaction of the artificial 12-aa proline-rich peptide PD1 with the SH3 domain of the hematopoietic cell kinase Hck and the peptide's potency in competitively displacing HIV-1 Nef from the Hck SH3 domain. PD1 was obtained from a phage display screen and exhibits exceptional affinity for the Hck SH3 domain (K-d = 0.23 mu M). Competition experiments using NMR spectroscopy demonstrate that the peptide even displaces Nef from Hck SH3 and allow for estimation of the Nef-Hck SH3 dissociation constant (K-d = 0.44 mu m), the strongest SH3 ligand interaction known so far. Consequences of this study for novel antiviral concepts are discussed.
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