This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. The subproject and investigator (PI) may have received primary funding from another NIH source, and thus could be represented in other CRISP entries. The institution listed is for the Center, which is not necessarily the institution for the investigator. CCR5 chemokine receptor is a known coreceptor of HIV1 entry. Sulfation of tyrosines at the extracellular N-terminal segment of CCR5 has been shown to mediate binding of the viral coat protein gp120. We recently elucidated the pattern and temporal sequence of tyrosine sulfation of a peptide corresponding to the N-terminus of CCR5 (Seibert C, Cadene M, Sanfiz A, Chait BT, Sakmar TP, Tyrosine sulfation of CCR5 N-terminal peptide by tyrosylprotein sulfotransferases 1 and 2 follows a discrete pattern and temporal sequence. Proc Natl Acad Sci U S A. 2002 Aug 20;99(17):11031-6.) So far little is known about the role of tyrosine sulfation in chemokine receptors function, or the generality of this modification. In particular, more work is needed to understand how tyrosine sulfation affects the receptor's ability to bind its natural chemokine ligands and to determine in which receptors it is critical to viral infection. To better understand these aspects of chemokine receptors function, we have undertaken the characterization of tyrosine sulfation in full-length CCR5 as well as other chemokine receptors.
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