Jun 7, 1976

Guanylate cyclase. Existence of different forms and their regulation by nucleotides in calf uterus

Biochimica Et Biophysica Acta
M I SiegelP Cuatrecasas

Abstract

The activity of calf uterus guanylate cyclase (EC 4.6.1.2) exists in at least two and most probably three distinct forms. The cytosolic enzyme exhibits hyperbolic substrate curves with respect to GTP and Mn2+, while the particulate cyclases (nuclear and microsomal)display sigmoidal (GTP) and hyperbolic (Mn2+) relationships. The Hill coefficient for the GTP dependence is 0.9 for the cytosolic, 1.5 for the nuclear, and 1.4 for the microsomal enzyme. The cytosolic enzyme has a Km for GTP of 70 muM while half maximal velocity occurs at 90 and 100 muM GTP for the nuclear and microsomal enzymes, respectively. The Ka for Mn2+ is 0.57, 0.71 or 0.75 mM for the cytosolic, nuclear, or microsomal enzyme, respectively.

  • References9
  • Citations13

References

Mentioned in this Paper

Macromolecular Compounds
Manganese
Structure of Calf of Leg
Entire Uterus
Neoplasm of Uncertain or Unknown Behavior of Uterus
Uterus
Microsomes
Purine Nucleotides
Cattle calf (organism)
Bos taurus

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