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    Proc Natl Acad Sci U S A. 2001 Sep 11;98(19):10692-7. Epub 2001 Sep 4.

    Regulation of melastatin, a TRP-related protein, through interaction with a cytoplasmic isoform.

    Source

    Department of Biological Chemistry, The Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.

    Abstract

    The TRP (transient receptor potential) superfamily includes a group of subfamilies of channel-like proteins mediating a multitude of physiological signaling processes. The TRP-melastatin (TRPM) subfamily includes the putative tumor suppressor melastatin (MLSN) and is a poorly characterized group of TRP-related proteins. Here, we describe the identification and characterization of an additional TRPM protein TRPM4. We reveal that TRPM4 and MLSN each mediate Ca(2+) entry when expressed in HEK293 cells. Furthermore, we demonstrate that a short form of MLSN (MLSN-S) interacts directly with and suppresses the activity of full-length MLSN (MLSN-L). This suppression seems to result from the inhibition of translocation of MLSN-L to the plasma membrane. We propose that control of translocation through interaction between MLSN-S and MLSN-L represents a mode for regulating ion channel activity.

    PMID:
    11535825
    [PubMed - indexed for MEDLINE]
    PMCID:
    PMC58528
    Free PMC Article

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