Catalytic activity:P (1) -P (3) -bis (5'-adenosyl) triphosphate + H (2) O = ADP + AMP. ,cofactor:Divalent cations. Magnesium , but manganese and to a lesser extent calcium or cobalt can be substituted; but not zinc , cadmium or nickel. ,Disease:A chromosomal aberration involving FHIT is observed in early onset bilateral and multifocal clear cell renal carcinoma [MIM:144700]. Translocation t (3;8) (3p14.2) . ,Disease:Associated with digestive tract cancers. Numerous tumor types are found to have aberrant forms of FHIT protein due to deletions in a coding region of chromosome 3p14.2 including the fragile site locus FRA3B. ,Function:Cleaves A-5'-PPP-5'A to yield AMP and ADP. Possible tumor suppressor for specific tissues. ,mass spectrometry: PubMed:15007172 ,similarity:Contains 1 HIT domain. ,subunit:Homodimer. ,tissue specificity:Low levels expressed in all tissues tested. Phospho-FHIT observed in liver and kidney , but not in brain and lung. Phospho-FHIT undetected in all tested human tumor cell lines. ,
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