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. 2003 Apr 15;371(Pt 2):463–471. doi: 10.1042/BJ20021962

MIM-B, a putative metastasis suppressor protein, binds to actin and to protein tyrosine phosphatase delta.

Jacquelyn A Woodings 1, Stewart J Sharp 1, Laura M Machesky 1
PMCID: PMC1223315  PMID: 12570871

Abstract

We have found that MIM-B, a putative metastasis suppressor protein, is implicated in actin cytoskeletal control and interaction with a protein tyrosine phosphatase (PTP). MIM was originally described as a protein whose mRNA was Missing in Metastasis, as it was found not to be present in metastatic bladder carcinoma cell lines [Lee, Y. G., Macoska, J. A., Korenchuk, S. and Pienta, K. J. (2002) Neoplasia 4, 291-294]. We further characterized a variant of MIM, which we call MIM-B, and which we believe may be a link between tyrosine kinase signalling and the actin cytoskeleton. We have shown, using purified proteins and cell extracts, that MIM-B is an actin-binding protein, probably via a WASP (Wiskott-Aldrich syndrome protein)-homology 2 domain at its C-terminus. We have also found that MIM-B binds to the cytoplasmic domain of receptor PTPdelta. Expression of full-length MIM-B induces actin-rich protrusions resembling microspikes and lamellipodia at the plasma membrane and promotes disassembly of actin stress fibres. The C-terminal portion of MIM-B is localized in the cytoplasm and does not affect the actin cytoskeleton when expressed, while the N-terminal portion localizes to internal vesicles and probably targets the protein to membranes. We postulate that MIM-B may be a regulator of actin assembly downstream of tyrosine kinase signalling and that this activity may explain the involvement of MIM in the metastasis of cancer cells.

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Selected References

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