TDPAC studies of111mCd in calciproteins: Calmodulin and parvalbumin |
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| Authors: | J N Rimbert F Adnet C Lafargue F Dumas C Wolf G Bereziat |
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| Institution: | (1) Faculté de Médecine Necker-Enfants Malades, Laboratoire de Biophysique, 156 rue de Vaugirard, 75730 Paris Cédex 15, France;(2) Laboratoire de Biochimie, C.H.U. Saint-Antoine, 27, rue Chaligny, 75771 Paris Cédex 12, France |
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| Abstract: | TDPAC measurements of the 150–247 keV gamma-ray cascade in111Cd have been performed at room temperature on Calmodulin (CaM) and Parvalbumin (Pa) labelled with radioactive111mCd. The anisotropy of the coincidence counting rate shows a time-dependent behaviour, typical of two different nuclear quadrupole
interactions (NQI) in CaM. The NQI parameters indicate the presence of two distinct metal-binding sites, presenting non-equivalent
local electric charge structure. In Pa samples, only one NQI is observed and the measured electric field gradient (EFG) value
agrees well with the large one obtained in CaM. |
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