Specificities and pH profiles of adenine and hypoxanthine-guanine-xanthine phosphoribosyltransferases (nucleotide synthases) of the thermoacidophile archaeon Sulfolobus solfataricus.Two open reading frames in the genome of Sulfolobus solfataricus (SSO2342 [corrected] and SSO2424) were cloned and expressed in E. coli. 
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