SHIP1, an SH2 domain containing polyinositol-5-phosphatase, regulates migration through two critical tyrosine residues and forms a novel signaling complex with DOK1 and CRKL - PubMed (original) (raw)
. 2001 Jan 26;276(4):2451-8.
doi: 10.1074/jbc.M006250200. Epub 2000 Oct 12.
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- PMID: 11031258
- DOI: 10.1074/jbc.M006250200
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SHIP1, an SH2 domain containing polyinositol-5-phosphatase, regulates migration through two critical tyrosine residues and forms a novel signaling complex with DOK1 and CRKL
M Sattler et al. J Biol Chem. 2001.
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Abstract
SHIP1 is an SH2 domain containing inositol-5-phosphatase that appears to be a negative regulator of hematopoiesis. The tyrosine kinase oncogene BCR/ABL drastically reduces expression of SHIP1. The major effect of re-expressing SHIP1 in BCR/ABL-transformed cells is reduction of hypermotility. To investigate the potential signaling pathways involving SHIP1 in hematopoietic cells, we overexpressed SHIP1 in a murine BCR/ABL-transformed Ba/F3 cell line and identified SHIP1-associated proteins. SHIP1 was found to form a novel signaling complex with BCR/ABL that includes DOK1 (p62(DOK)), phosphatidylinositol 3-kinase (PI3K), and CRKL, each of which has been previously shown to regulate migration in diverse cell types. We found that DOK1 binds directly through its PTB domain to SHIP1. Direct interaction of SHIP1 with CRKL was mediated through the CRKL-SH2 domain. Co-precipitation experiments suggest that Tyr(917) and Tyr(1020) in SHIP1 are likely to mediate interactions with DOK1. In contrast to wild type SHIP1, expression of tyrosine mutant SHIP1 by transient transfection did not alter migration. PI3K was likely linked to this complex by CRKL. Thus, this complex may serve to generate a very specific set of phosphoinositol products, possibly involved in regulating migration. Overall, these data suggest that proteins that interact with SHIP1 through Tyr(917) and Tyr(1020), such as DOK1 and SHC, are likely to be involved in the regulation of SHIP1 dependent migration.
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