%0 Journal Article %1 Bommakanti1993 %A Bommakanti, R. K. %A Klotz, K. N. %A Dratz, E. A. %A Jesaitis, A. J. %D 1993 %J J Leukoc Biol %K Acid Amino Animals Autoradiography Data Densitometry Formyl GTP-Binding Humans Immunologic/*chemistry Leucyl-Phenylalanine/metabolism Models, Molecular N-Formylmethionine Neutrophils/*ultrastructure Peptide Peptide/*chemistry Proteins/*physiology Sequence Structure Receptor %N 6 %P 572-7 %T A carboxyl-terminal tail peptide of neutrophil chemotactic receptor disrupts its physical complex with G protein %U http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Citation&list_uids=8245709 %V 54 %X The binding of G protein to the N-formyl peptide receptor of human neutrophils was investigated with site-specific synthetic peptides. Peptide CT336(322) (322RALTEDSTQTSDTAT336) from the carboxyl-terminal tail region of the receptor competed with the receptor for binding to bovine Gi protein. The peptide competition was assayed by dissociation of a GTP-sensitive, rapidly sedimenting (7S) form of receptor-G protein complex as analyzed by velocity sedimentation on linear sucrose density gradients. An IC50 of 590 microM was determined for CT336(322) peptide. A control peptide, with the reverse sequence, rCT322(336) (336TATDSTQTSDETLAR322), did not perturb the sedimentation of the reconstituted receptor-G protein complex up to the highest tested concentration, 3 mM. Other peptides tested, corresponding to central portions of the predicted intracellular loop regions CII140(127) (127VLHPVWTQNHRTVS140) and CIII239(227) (227KIHKQGLIKSSRP239) of the receptor, failed to dissociate the reconstituted receptor-G protein complex. Control peptides from the extracellular region EII184(170) (170KTGTVACTFNFSPWT184) and an unrelated sequence matching a portion of neutrophil cytochrome b, CYT306(296) (296KVVITKVVTHPFKTIE306), were also ineffective. Our results suggest that the cytoplasmic tail of the formyl chemotactic peptide receptor is involved in its coupling to the signal-transducing G protein.

@article{Bommakanti1993, abstract = {The binding of G protein to the N-formyl peptide receptor of human neutrophils was investigated with site-specific synthetic peptides. Peptide CT336(322) (322RALTEDSTQTSDTAT336) from the carboxyl-terminal tail region of the receptor competed with the receptor for binding to bovine Gi protein. The peptide competition was assayed by dissociation of a GTP-sensitive, rapidly sedimenting (7S) form of receptor-G protein complex as analyzed by velocity sedimentation on linear sucrose density gradients. An IC50 of 590 microM was determined for CT336(322) peptide. A control peptide, with the reverse sequence, rCT322(336) (336TATDSTQTSDETLAR322), did not perturb the sedimentation of the reconstituted receptor-G protein complex up to the highest tested concentration, 3 mM. Other peptides tested, corresponding to central portions of the predicted intracellular loop regions CII140(127) (127VLHPVWTQNHRTVS140) and CIII239(227) (227KIHKQGLIKSSRP239) of the receptor, failed to dissociate the reconstituted receptor-G protein complex. Control peptides from the extracellular region EII184(170) (170KTGTVACTFNFSPWT184) and an unrelated sequence matching a portion of neutrophil cytochrome b, CYT306(296) (296KVVITKVVTHPFKTIE306), were also ineffective. Our results suggest that the cytoplasmic tail of the formyl chemotactic peptide receptor is involved in its coupling to the signal-transducing G protein.}, added-at = {2010-12-14T18:12:02.000+0100}, author = {Bommakanti, R. K. and Klotz, K. N. and Dratz, E. A. and Jesaitis, A. J.}, biburl = {https://www.bibsonomy.org/bibtex/242a41987708b67f61781d7024f4a7291/pharmawuerz}, endnotereftype = {Journal Article}, interhash = {8c0ac5392c8ff848968853602e77706c}, intrahash = {42a41987708b67f61781d7024f4a7291}, issn = {0741-5400 (Print) 0741-5400 (Linking)}, journal = {J Leukoc Biol}, keywords = {Acid Amino Animals Autoradiography Data Densitometry Formyl GTP-Binding Humans Immunologic/*chemistry Leucyl-Phenylalanine/metabolism Models, Molecular N-Formylmethionine Neutrophils/*ultrastructure Peptide Peptide/*chemistry Proteins/*physiology Sequence Structure Receptor}, month = Dec, note = {Bommakanti, R K Klotz, K N Dratz, E A Jesaitis, A J R01 AI22735/AI/NIAID NIH HHS/United States Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S. United states Journal of leukocyte biology J Leukoc Biol. 1993 Dec;54(6):572-7.}, number = 6, pages = {572-7}, shorttitle = {A carboxyl-terminal tail peptide of neutrophil chemotactic receptor disrupts its physical complex with G protein}, timestamp = {2010-12-14T18:22:02.000+0100}, title = {A carboxyl-terminal tail peptide of neutrophil chemotactic receptor disrupts its physical complex with G protein}, url = {http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Citation&list_uids=8245709}, volume = 54, year = 1993 }