PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 3182770-3 1988 The time course of the fluorescence intensity change of the protein complex subsequent to rapid decrease of free Ca2+ concentration of the solution was measured with a stopped-flow spectrophotometer: The process was exponential and its rate constant was 9.9 s-1 for IAANS-Tn-NPTm at pCa 8.95 and 26.6 s-1 for Tn(DANZ-TnC)-NPTm at pCa 8.99 in the absence of MgCl2 in the same solvent system as in the fluorescence titration experiment. Magnesium Chloride 357-362 tenascin C Homo sapiens 317-320 2808376-6 1989 In the presence of 10 mM MgCl2, the two Ca2+-binding sites of both TnC isoforms exhibit a 2-3-fold lower affinity. Magnesium Chloride 25-30 tenascin C Homo sapiens 67-70 659395-5 1978 The dissociation constants of calcium bound to TN-C, K and K", calculated from the experimentally determined rate constants were K = 3.16 X 10(-7) M, K" = 1.58 X 10(-6) M in the absence of magnesium ion, and K = K" = 1 X 10(-6) M in the presence of 2 mM MgCl2. Magnesium Chloride 254-259 tenascin C Homo sapiens 47-51