The tyrosine kinase activity of the chicken insulin receptor is similar to that of the human insulin receptor.
The tyrosine kinase activity of a chimeric insulin receptor composed of the extracellular domain of the human insulin receptor (IR) and the intracellular domain of the chicken IR was compared with wild-type human IR. The degrees of autophosphorylation, phosphorylation of IRS-1, and in vitro phosphorylation of an exogenous substrate after stimulation by human insulin were similar to that seen with the human IR. We conclude that the insulin resistance of chickens is not attributable to a lower level of intrinsic tyrosine kinase activity of IR.
Kato
H
H
Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Japan. akatoq@mail.ecc.u-tokyo.ac.jp
Okubo
Y
Y
Matsumura
Y
Y
Roberts
C T
CT
Sugahara
K
K
LeRoith
D
D
D016475:3T3 Cells; D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002645:Chickens; D018076:DNA, Complementary; D006801:Humans; D055504:Insulin Receptor Substrate Proteins; D008297:Male; D051379:Mice; D008969:Molecular Sequence Data; D010750:Phosphoproteins / Q000378:metabolism; D010766:Phosphorylation; D011505:Protein-Tyrosine Kinases / Q000235:genetics / Q000378:metabolism*; D011972:Receptor, Insulin / Q000235:genetics / Q000378:metabolism*
D018076:DNA, Complementary; C526292:IRS1 protein, human; D055504:Insulin Receptor Substrate Proteins; C526295:Irs1 protein, mouse; D010750:Phosphoproteins; D011505:Protein-Tyrosine Kinases; D011972:Receptor, Insulin