Abstract
Bovine GH (bGH) analogs with single amino acid substitutions at positions 117 (bGH-E117L), 119 (bGH-G119R), and 122 (bGH-A122D) were generated. These analogs bind to mouse liver membrane preparations with affinities similar to native bGH. However, transgenic mice which express the analogs demonstrate different phenotypes ranging from dwarfism to gigantism. For example, expression of bGH or bGH-E117L result in large transgenic mice. In contrast, transgenic mice with a growth phenotype similar to nontransgenic animals result from expression of bGH-A122D. Surprisingly, transgenic mice with relatively high serum levels of bGH-G119R possessed a dwarf phenotype. Together these results suggest that Gly 119 and Ala 122 are involved in growth-promoting activity of GH.
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