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Gene Review

irs4  -  insulin receptor substrate 4

Xenopus laevis

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High impact information on IRS2

  • Microinjection of mRNA encoding a Myc-tagged xIRS-u into Xenopus oocytes resulted in the expression of a 120-kDa protein (including 5 copies of the 13-amino acid Myc tag) [1].
  • The xIRS-u cDNA encodes an open reading frame of 1003 amino acids including a putative amino-terminal pleckstrin homology (PH) domain and phosphotyrosine-binding (PTB) domain [1].
  • Pair-wise amino acid sequence comparisons with the previously identified xIRS-1 and the four members of the mammalian IRS family (1 through 4) indicated that xIRS-u has similar overall sequence homology (33-45% identity) to all mammalian IRS proteins [1].
  • The carboxy terminus of xIRS-u contains several potential Src homology 2 (SH2)-binding sites, five of which are in the context of YM/LXM (presumptive binding sites for phosphatidylinositol 3-kinase) [1].

Anatomical context of IRS2

  • The injection of xIRS-u mRNA accelerated insulin-induced MAP kinase activation with a concomitant acceleration of insulin-induced oocyte maturation [1].

Analytical, diagnostic and therapeutic context of IRS2


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