Human diadenosine triphosphate hydrolase: preliminary characterisation and comparison with the Fhit protein, a human tumour suppressor.
نویسندگان
چکیده
Human platelets diadenosine triphosphatase was characterised and compared with the Fhit protein, a human tumour suppressor with diadenosine triphosphatase activity. Both enzymes exhibit similar Km, are similarly activated by Mg2+, Ca2+ and Mn2+, and inhibited by Zn2+ and suramin. However, they are differentially inhibited by Fhit antibodies and exhibit differences in gel-filtration behaviour.
منابع مشابه
The Fhit tumor suppressor protein regulates the intracellular concentration of diadenosine triphosphate but not diadenosine tetraphosphate.
To determine the role of the FHIT tumor suppressor gene product, a diadenosine 5',5'''-P1,P3-triphosphate (Ap3A) hydrolase, in the regulation of the concentration of Ap3A and diadenosine 5',5'''-P1,P4-tetraphosphate (Ap4A) in vivo, the levels of the adenosine(5')triphospho(5')nucleoside (Ap3N) and adenosine(5')tetraphospho(5')nucleoside (Ap4N) families were measured by luminometry in a number o...
متن کاملFHIT (fragile histidine triad)
Fhit protein is a tumor suppressor with reduced or no expression in many types of cancer. Fhit expression is more frequently lost in cancers of individuals with familial mutations causing deficiency in DNA repair genes such as BRCA1 and BRCA2 and MSH2. In vitro Fhit acts as a hydrolase that cleaves diadenosine triphosphate (Ap3A) to ADP and AMP. The Fhit-Ap3A enzyme-substrate complex appears to...
متن کاملNitrilase and Fhit homologs are encoded as fusion proteins in Drosophila melanogaster and Caenorhabditis elegans.
The tumor suppressor gene FHIT encompasses the common human chromosomal fragile site at 3p14.2 and numerous cancer cell biallelic deletions. To study Fhit function we cloned and characterized FHIT genes from Drosophila melanogaster and Caenorhabditis elegans. Both genes code for fusion proteins in which the Fhit domain is fused with a novel domain showing homology to bacterial and plant nitrila...
متن کاملSelective monitoring of the enzymatic activity of the tumor suppressor Fhit.
Cancer is a leading cause of death worldwide. Functional inactivation of tumor suppressor proteins, mainly by mutations in the corresponding genes, is a key event in cancer development. The fragile histidine triade protein (Fhit) is a tumor suppressor that is frequently affected in different cancer types. Fhit possesses diadenosine triphosphate hydrolase activity, but although reduction of its ...
متن کاملAssociation of FHIT (fragile histidine triad), a candidate tumour suppressor gene, with the ubiquitin-conjugating enzyme hUBC9.
FHIT (fragile histidine triad), a candidate tumour suppressor gene, has recently been identified at chromosomal region 3p14.2, and deletions of the gene have been reported in many types of human cancer. However, the biological function of the Fhit protein has not been fully characterized yet. Using the yeast two-hybrid screen to search for proteins that interact with Fhit in vivo, we identified...
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عنوان ژورنال:
- Acta biochimica Polonica
دوره 47 2 شماره
صفحات -
تاریخ انتشار 2000