Identification and primary structure of a calbindin 9K binding domain in the plasma membrane Ca2+ pump.
Bovine calbindin 9K has been conjugated to a bifunctional, photoactivatable, cleavable and radioactive cross-linker. It has been photolyzed in the presence of preparations of the purified erythrocyte Ca2+ pump, and shown to interact with it in the presence of Ca2+. The affinity of the interaction has been studied using the fluorescence enhancement of dansylated calbindin 9K incubated with the synthetic calmodulin binding domain of the pump. Two versions of the domain have been used, one corresponding to its full length (28 residues), one to about 2/3 of it (20 residues). The affinity of the interaction was between 5 and 10 times lower than in the case of calmodulin.
James
P
P
Laboratory of Biochemistry, Swiss Federal Institute of Technology, ETH, Zürich.
Vorherr
T
T
Thulin
E
E
Forsen
S
S
Carafoli
E
E
D000595:Amino Acid Sequence; D000818:Animals; D001665:Binding Sites; D064026:Calbindins; D002118:Calcium / Q000378:metabolism*; D000252:Calcium-Transporting ATPases / Q000378:metabolism*; D002147:Calmodulin / Q000378:metabolism; D002417:Cattle; D002462:Cell Membrane / Q000201:enzymology; D003432:Cross-Linking Reagents; D003619:Dansyl Compounds; D004912:Erythrocytes / Q000201:enzymology; D066298:In Vitro Techniques; D008969:Molecular Sequence Data; D010455:Peptides / Q000138:chemical synthesis / Q000737:chemistry; D064030:S100 Calcium Binding Protein G / Q000378:metabolism*; D013057:Spectrum Analysis
D064026:Calbindins; D002147:Calmodulin; D003432:Cross-Linking Reagents; D003619:Dansyl Compounds; D010455:Peptides; D064030:S100 Calcium Binding Protein G; D000252:Calcium-Transporting ATPases; D002118:Calcium