Abstract:
:The SH2 domain containing inositol 5'-phosphatase (SHIP) was initially described as a 145-kDa protein phosphorylated on tyrosines upon growth factor and cytokine stimulation. It was shown to be phosphorylated after Fc and B cell receptor activation and plays a role in negative signaling. Different isoforms of the SHIP protein result from alternative mRNA splicing, proteolysis, or a combination of both. The expression of discrete SHIP isoforms changes with the potential developmental-dependent maturation state of myeloid cells, suggesting mechanisms for the regulation of SHIP interactions with other signaling molecules. A p135 (SHIPbeta) spliced isoform is known to be expressed in developing myeloid cells. Now we have identified a new SHIP isoform, SHIPdelta, which is the product of an out-of-frame splice with a deletion of 167 nucleotides in the C-terminal region, resulting in an approximately 110-kDa protein. Biochemically, SHIPdelta differs from SHIPalpha by exhibiting little or no tyrosine phosphorylation or association with the signaling protein Shc after M-CSF activation of FD-Fms cells. In addition, we have characterized the structure of the entire SHIP genomic locus, which provides a basis for understanding the alternative splicing events. SHIP is expressed in hematopoiesis and spermatogenesis, and we also describe the promoter for the SHIP gene, which has potential for explaining the tissue-specific expression pattern.
journal_name
Genomicsjournal_title
Genomicsauthors
Wolf I,Lucas DM,Algate PA,Rohrschneider LRdoi
10.1006/geno.2000.6324subject
Has Abstractpub_date
2000-10-01 00:00:00pages
104-12issue
1eissn
0888-7543issn
1089-8646pii
S0888-7543(00)96324-9journal_volume
69pub_type
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