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. 1990 Feb;99(2):297–302. doi: 10.1111/j.1476-5381.1990.tb14698.x

Characterisation of stereospecific binding sites for inositol 1,4,5-trisphosphate in airway smooth muscle.

E R Chilvers 1, R A Challiss 1, A L Willcocks 1, B V Potter 1, P J Barnes 1, S R Nahorski 1
PMCID: PMC1917368  PMID: 2158373

Abstract

1. A 'P2' membrane fraction of bovine tracheal smooth muscle displays high affinity (KD 3.8 +/- 0.2 nM), saturable (Bmax 1003 +/- 170 fmol mg-1 protein) and reversible binding of D-myo[3H]-inositol 1,4,5-trisphosphate ([3H]-Ins(1,4,5)P3). 2. This binding site shows strict stereo- and positional specificity for the D-Ins(1,4,5)P3 isomer with L-Ins(1,4,5)P3, DL-Ins(1,3,4,5)P4 and D-Ins(1,3,4)P3 displacing [3H]-Ins(1,4,5)P3 with Ki values of 20 microM, 0.35 microM and 2.4 microM, respectively. 3. Specific binding of [3H]-Ins(1,4,5)P3 is enhanced at alkaline pH values (maximal at pH 7.75) and, in distinct contrast to [3H]-Ins(1,4,5)P3 binding in rat cerebellum membranes, is not inhibited by Ca2+ (5-500 microM). 4. Heparin displaces [3H]-Ins(1,4,5)P3 specific binding with an IC50 of 7.6 +/- 1.0 micrograms ml-1. 5. Comparative studies demonstrated specific [3H]-Ins(1,4,5)P3 binding in bovine cardiac atrial preparations (Bmax 75 +/- 5 fmol mg-1 protein) and very low specific [3H]-Ins(1,4,5)P3 binding in bovine cardiac ventricle and skeletal muscle membranes (less than or equal to 25 fmol mg-1 protein).

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Selected References

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