Identification of CC chemokine receptor 7 residues important for receptor activation.
The binding pocket of family A GPCRs that bind small biogenic amines is well characterized. In this study we identify residues on CC chemokine receptor 7 (CCR-7) that are involved in agonist-mediated receptor activation but not in high affinity ligand binding. The mutations also affect the ability of the ligands to induce chemotaxis. Two of the residues, Lys3.33(137) and Gln5.42(227), are consistent with the binding pocket described for biogenic amines, while Lys3.26(130) and Asn7.32(305), are found at, or close to, the cell surface. Our observations are in agreement with findings from other peptide and chemokine receptors, which indicate that receptors that bind larger ligands contain contact sites closer to the cell surface in addition to the conventional transmembrane binding pocket. These findings also support the theory that chemokine receptors require different sets of interactions for high affinity ligand binding and receptor activation.
Department of Exploratory Discovery, Neurocrine Biosciences, San Diego, California 92130, USA.
Thomas R
TR
Ott
Anil
A
Pahuja
Sarah A
SA
Nickolls
David G
DG
Alleva
R Scott
RS
Struthers
D000595:Amino Acid Sequence; D000818:Animals; D001216:Asparagine / Q000737:chemistry; D001665:Binding Sites; D016466:CHO Cells; D019556:COS Cells; D002462:Cell Membrane / Q000378:metabolism; D054415:Chemokine CCL19; D054421:Chemokine CCL21; D019742:Chemokines, CC / Q000737:chemistry; D002633:Chemotaxis; D006224:Cricetinae; D004305:Dose-Response Relationship, Drug; D018274:Electroporation; D005973:Glutamine / Q000737:chemistry; D006147:Guanine / Q000737:chemistry; D016244:Guanosine 5'-O-(3-Thiotriphosphate) / Q000378:metabolism; D006801:Humans; D020128:Inhibitory Concentration 50; D019169:Jurkat Cells; D008024:Ligands; D008239:Lysine / Q000737:chemistry; D008969:Molecular Sequence Data; D009154:Mutation; D010455:Peptides / Q000737:chemistry; D017354:Point Mutation; D011485:Protein Binding; D011487:Protein Conformation; D017434:Protein Structure, Tertiary; D054400:Receptors, CCR7; D019707:Receptors, Chemokine / Q000737:chemistry*; D017386:Sequence Homology, Amino Acid; D013997:Time Factors; D014162:Transfection; D014443:Tyrosine / Q000737:chemistry
C515460:CCL19 protein, human; C515478:CCL21 protein, human; C515370:CCR7 protein, human; D054415:Chemokine CCL19; D054421:Chemokine CCL21; D019742:Chemokines, CC; D008024:Ligands; D010455:Peptides; D054400:Receptors, CCR7; D019707:Receptors, Chemokine; D005973:Glutamine; D016244:Guanosine 5'-O-(3-Thiotriphosphate); D014443:Tyrosine; D006147:Guanine; D001216:Asparagine; D008239:Lysine