Md. Ware et al., CLONING AND CHARACTERIZATION OF HUMAN SHIP, THE 145-KD INOSITOL 5-PHOSPHATASE THAT ASSOCIATES WITH SHC AFTER CYTOKINE STIMULATION, Blood, 88(8), 1996, pp. 2833-2840
We recently cloned and sequenced a cDNA encoding a 145-kD protein from
the murine hematopoietic cell line B6SUtA(1) that becomes tyrosine ph
osphorylated and associated with She after cytokine stimulation. Based
on its domains and enzymatic activity, we named this protein SHIP for
SH2-containing inositol phosphatase (Damen et al, Proc Natl Acad Sci
USA 93:1689, 1996). We describe here the cloning of the human homologu
e of murine SHIP (mSHIP) from a human megakaryocytic cell line (MO7e)
lambda gt11 cDNA library using two nonoverlapping mSHIP cDNA fragments
as probes. Northern blot analysis suggests that human SHIP (hSHIP) is
expressed as a 5.3-kb mRNA in human bone marrow and a wide variety of
other tissues. Sequence analysis of this cDNA predicts a protein of 1
188 amino acids exhibiting 87.2% overall sequence identity with mSHIP,
Contained within the defined open reading frame is an N-terminal, gro
up I src homology 2 (SH2) domain; three NXXY motifs that, if phosphory
lated, could be bound by phosphotyrosine binding (PTB) domains; a C-te
rminal proline-rich region; and two centrally located inositol polypho
sphate 5-phosphatase motifs. Fluorescence in situ hybridization, using
the full-length hSHIP cDNA as a probe, mapped hSHIP to the long arm o
f chromosome 2 at the border between 2q36 and 2q37. (C) 1996 by The Am
erican Society of Hematology.