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Temperature-dependent functional changes in sarcoplasmic reticulum membranes

Klebanov, G.I.; Poglazov, A.F.; Nikushkin, E.V.; Shubin, M.V.; Rubtsov, B.V.

Biofizika 24(4): 699-703

1979

ISSN/ISBN: 0006-3029
PMID: 157782
Document Number: 140120
Temperature effect on changes in calcium ion transport and activity of Ca-ATPase of sarcoplasmic reticulum vesicles (SRV) was studied. Several temperature intervals of the change of SRV functional activity parameters were found: 8-12 degrees C-beginning of accumulation of SRV Ca2+, 12-19 degrees sharp activation of Ca2+ accumulation, 27-32 degrees-activation of passive yield, 36-43 degrees-reversible change of the activity of the accumulation system and activation of Ca yield, 48 degrees and higher--irreversible denaturation of transport Ca-ATPase. Coincidence of temperature intervals of SRV structural reconstructions, detected by means of fluorescent probes and functional changes points to a close relationship between structural reconstructions and functional responses of biological membranes.

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