title: The determination of the separation of tyrosine-99 and tyrosine-138 in calmodulin: radiationless energy transfer.
abstract: The average separation of the phenolic groups of tyrosine-99 and tyrosine-138 has been measured by radiationless energy transfer between each tyrosine and the nitro derivative of the second tyrosine. A separation of 16.7 +/- 0.7 A was found in the absence of Ca2+ and 15.5 +/- 0.7 A in the presence of Ca2+.
mesh_terms: D000818:Animals; D002118:Calcium / Q000494:pharmacology; D002147:Calmodulin; D002417:Cattle; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D004735:Energy Transfer; D005453:Fluorescence; D008297:Male; D013050:Spectrometry, Fluorescence; D014443:Tyrosine
chemical_list: D002147:Calmodulin; D014443:Tyrosine; D002118:Calcium