|Title:||Cloning, Mapping, and Characterization of the Human Sorbin and Sh3 Domain Containing 1 (Sorbs1) Gene: A Protein Associated with C-Abl during Insulin Signaling in the Hepatoma Cell Line Hep3b||Authors:||TAI, TONG-YUAN
|Keywords:||TYROSINE KINASE;TRANSFORMING ACTIVITY;BINDING-PROTEIN;STRESS FIBERS;PIMA-INDIANS;CAP||Issue Date:||2001||Journal Volume:||v.74||Journal Issue:||n.1||Start page/Pages:||12-20||Source:||GENOMICS||Abstract:||
SH3P12/CAP/ponsin, a gene product with a sorbin homology domain and three consecutive SH3 domains in the carboxy- terminus, has been isolated from murine adipocytes and identified as an important adaptor during insulin signaling. Here we describe the cloning, mapping, and expression of the human homologue, termed SORBS1 (sorbin and SH3 domain containing 1). Multiple transcripts of this gene with different mRNA isoforms were observed among different tissues. Here we report 13 alternatively spliced exons, which were ascertained from the full-length cDNA cloned in adipose, liver, and skeletal muscle tissues. Among the major isoforms, the shortest, 2223-bp, open reading frame (ORF) encodes a protein with a predicted molecular weight of 81.5 kDa, while the longest, 3879-bp, ORF encodes a protein of about 142.2 kDa. This gene was mapped to human chromosome 10 q23.3q24.1, which is a candidate region for insulin resistance found in Pima Indians. In human hepatoma Hep3B cells, SORBS1 was partly dissociated from the insulin receptor complex and bound to c-Ab 1 protein upon insulin stimulation. This interaction with c-Ab1 was through the third SH3 domain and a possible conformational change of SORBS 1 induced by insulin. Our data suggest that c-Ab1 oncoprotein via SORBS1 might play a role in the insulin signaling pathway. (C) 2001 Academic Press.
|Appears in Collections:||醫學系|
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