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@ARTICLE{Bauer:46280,
author = {Bauer, F. and Hofinger, E. and Hoffmann, S. and Rösch, P.
and Schweimer, K. and Sticht, H.},
title = {{C}haracterization of {L}ck-binding elements in the
herpesviral regulatory {T}ip protein},
journal = {Biochemistry},
volume = {43},
issn = {0006-2960},
address = {Columbus, Ohio},
publisher = {American Chemical Society},
reportid = {PreJuSER-46280},
pages = {14932-9},
year = {2004},
note = {Record converted from VDB: 12.11.2012},
abstract = {Herpesvirus saimiri encodes a tyrosine kinase interacting
protein (Tip) that binds to T-cell-specific tyrosine kinase
Lck via multiple sequence motifs and controls its activity.
The regulation of Lck by Tip represents a key mechanism in
the transformation of human T-lymphocytes during herpesviral
infection. In this study, the interaction of Tip with the
regulatory SH3 and SH2 domains of Lck was investigated by
biophysical and computational techniques. NMR spectroscopy
of isotopically labeled Tip(140-191) revealed that the
interaction with the LckSH3 domain is not restricted to the
classical proline-rich motif, but also involves the
C-terminally adjacent residues which pack into a hydrophobic
pocket on the surface of the SH3 domain, thus playing a
likely role in mediating binding specificity. Fluorescence
binding studies of Tip further demonstrate that Tyr127 in
its phosphorylated form represents a strong ligand of the
LckSH2 domain, indicating the presence of an additional Lck
interaction motif. In contrast, Tyr114, known to be
essential for STAT-3 binding, does not interact with the
LckSH2 domain, showing that the tyrosines in Tip exhibit
distinct binding specificity. The existence of numerous
interaction sites between Tip and the regulatory domains of
Lck implies a complex regulatory mechanism and may have
evolved to allow a gradual regulation of Lck activity in
different pathogenic states.},
keywords = {Amino Acid Sequence / Circular Dichroism / Cloning,
Molecular / Conserved Sequence / Herpesvirus 2, Saimiriine:
chemistry / Herpesvirus 2, Saimiriine: enzymology /
Herpesvirus 2, Saimiriine: metabolism / Hydrophobic and
Hydrophilic Interactions / Kinetics / Ligands / Lymphocyte
Specific Protein Tyrosine Kinase p56(lck): chemistry /
Lymphocyte Specific Protein Tyrosine Kinase p56(lck):
metabolism / Models, Molecular / Molecular Sequence Data /
Nuclear Magnetic Resonance, Biomolecular / Phosphoproteins:
chemistry / Phosphoproteins: genetics / Phosphoproteins:
isolation $\&$ purification / Phosphoproteins: metabolism /
Phosphotyrosine: chemistry / Protein Binding / Protein
Structure, Secondary / Protons / Sequence Homology, Amino
Acid / Spectrometry, Fluorescence / Viral Proteins:
chemistry / Viral Proteins: genetics / Viral Proteins:
isolation $\&$ purification / Viral Proteins: metabolism /
Ligands (NLM Chemicals) / Phosphoproteins (NLM Chemicals) /
Protons (NLM Chemicals) / Viral Proteins (NLM Chemicals) /
tyrosine kinase interacting protein, Saimiriine herpesvirus
2 (NLM Chemicals) / Phosphotyrosine (NLM Chemicals) /
Lymphocyte Specific Protein Tyrosine Kinase p56(lck) (NLM
Chemicals) / J (WoSType)},
cin = {IBI-2},
ddc = {570},
cid = {I:(DE-Juel1)VDB58},
pnm = {Neurowissenschaften},
pid = {G:(DE-Juel1)FUEK255},
shelfmark = {Biochemistry $\&$ Molecular Biology},
typ = {PUB:(DE-HGF)16},
pubmed = {pmid:15554700},
UT = {WOS:000225353300007},
doi = {10.1021/bi0485068},
url = {https://juser.fz-juelich.de/record/46280},
}