Participation of a dialyzable cofactor in the relaxing factor system of muscle III. Substitution of pyrophosphate for the cofactor

Autor: Kaldor, G., Gergely, J., Norman Briggs, F.
Zdroj: Biochimica et Biophysica Acta (BBA); January 1959, Vol. 34 Issue: 1 p224-227, 4p
Abstrakt: 2 mMpyrophosphate restores the capacity of muscle granules sedimented at 35,000 × gto relax muscle fibres and inhibit myofibrillar adenosinetriphosphatase. These effects are reversed by Ca++, pyrophosphate, thus, can replace the dialyzable cofactor described in the preceding two communications7,8. Pyrophosphatase destroys the activating effect of pyrophosphate but not that of the cofactor present in the 35, 000 × g-supernatant, rendering it unlikely that the cofactor is identical with pyrophosphate.
Databáze: Supplemental Index