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Nucleic Acids Research, 1988, Vol. 16, No. 14 7087-7101
© 1988

Articles

Analysis of cDNA encoding the hypoxanthine-guanine phosphoribosyltransferase (HGPRTase) of Schistosoma mansoni; a putative target for chemotherapy

Sydney P. Craig, III, James H. McKerrow1, George R. Newport and Ching C. Wang

Department of Pharmaceutical Chemistry, University of California San Francisco, CA 94143, USA 1Department of Pathology, University of California San Francisco, CA 94143, USA

Received May 25, 1988. Accepted June 15, 1988.

Because of the lack of de novo purine biosynthesis, hypoxanthine-guanine phosphoribosyltransferase (HGPRTase) is a critical enzyme in the purine metabolic pathway of the human parasite, Schistosoma mansoni. Using a cDNA clone encoding mouse HGPRTase and subsequently a synthetic oligonucleotide derived from sequencing a clone of genomic DNA, two clones were isolated from an adult schistosome cDNA library. One clone is 1.374 Kilobases (Kb) long and has an open reading frame of 693 bases. The deduced 231 amino acid sequence has 47.9% identity in a 217 amino acid overlap with human HGPRTase. Northern blot analysis indicates that the full length of mRNA for the S. mansoni HGPRTase is 1.45–1.6 Kb. Analysis of the primary structures of the putative active site for human and parasite enzymes reveal specific differences which may eventually be exploitable in the design of drugs for the treatment of schistosomiasis.


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