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    FEBS Lett. 1999 Jan 8;442(1):99-104.

    The human and rat forms of multiple inositol polyphosphate phosphatase: functional homology with a histidine acid phosphatase up-regulated during endochondral ossification.

    Source

    Inositide Signaling Group, National Institute of Environmental Health Sciences, NIH, Research Triangle Park, NC 27709, USA. caffrey@niehs.nih.gov

    Abstract

    We have derived the full-length sequences of the human and rat forms of the multiple inositol polyphosphate phosphatase (MIPP); their structural and functional comparison with a chick histidine acid phosphatase (HiPER1) has revealed new information: (1) MIPP is approximately 50% identical to HiPER1, but the ER-targeting domains are divergent; (2) MIPP appears to share the catalytic requirement of histidine acid phosphatases, namely, a C-terminal His residue remote from the RHGxRxP catalytic motif; (3) rat MIPP mRNA is up-regulated during chondrocyte hypertrophy. The latter observation provides a context for proposing that MIPP may aid bone mineralization and salvage the inositol moiety prior to apoptosis.

    PMID:
    9923613
    [PubMed - indexed for MEDLINE]

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