PMID: 8448172Mar 5, 1993Paper

Comparing the human and schistosomal hypoxanthine-guanine phosphoribosyltransferases by circular dichroism

Biochimica Et Biophysica Acta
L YuanC C Wang

Abstract

The hypoxanthine-guanine phosphoribosyltransferases (HGPRTases) of human and the parasitic trematode, Schistosoma mansoni, are of biomedical importance. The conformations of these two enzymes were studied by circular dichroism (CD). The schistosomal HGPRTase is estimated to contain 27% alpha-helix and 30% beta-structure. This result is consistent with what is predicted from a tertiary model (Craig, S.P., Cohen, F.E., Yuan, L., McKerrow, J.H. and Wang, C.C. (1991) in Molecular & Immunological Aspects of Parasitism (Wang, C.C., ed.), pp. 122-138, Am. Assoc. Adv. Sci., Washington DC, USA), which proposes that the enzyme is an alpha/beta barrel protein. The human enzyme is estimated to contain 21% alpha-helix and 53% beta-form. The two enzymes are different in their thermostability. The human enzyme remains active after being heated to 85 degrees C for 15 min, while the schistosomal enzyme only retains its activity at temperature below 65 degrees C. The transition temperature (T1/2) of the schistosomal HGPRTase was determined by CD measurement to be 57.5 degrees C. One of the enzyme substrates, phosphoribose pyrophosphate (PRPP), stabilizes the HGPRTases by preventing the human enzyme from unfolding at 85 degrees C and partially pr...Continue Reading

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Citations

Sep 3, 2003·Pharmacology & Therapeutics·Mahmoud H el Kouni
Apr 15, 2008·Biochimica Et Biophysica Acta·Deyse de Souza DantasFrancisco Javier Medrano
Jun 1, 1996·International Journal of Biological Macromolecules·C MonteroM Menendez
Jun 5, 2004·Archives of Biochemistry and Biophysics·Jayalakshmi RamanHemalatha Balaram

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