Glucagon (22-29) is partial agonist of Glucagon (19–29). Glucagon specifically inhibits the Ca2+ pump in liver plasma membranes independently of adenylate cyclase activation[1][2].
References
[1] Mallat A, et al. A glucagon fragment is responsible for the inhibition of the liver Ca2+ pump by glucagon. Nature. 1987 Feb 12-18;325(6105):620-2. DOI:10.1038/325620a0 [2] Pavoine C, et al. Miniglucagon [glucagon-(19-29)] is a component of the positive inotropic effect of glucagon. Am J Physiol. 1991 May;260(5 Pt 1):C993-9. DOI:10.1152/ajpcell.1991.260.5.C993
