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What does PAP39 stand for?

PAP39 stands for PRPP synthetase-associated protein of 39 kDa

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PRPP Synthetase-associated Protein 8335 an N-acylamino acid from N terminally acylated peptides, and whole products were sequenced, The protease digestion is essential because the releasing enzyme cannot react with long peptides having about 30 amino acid residues. cDNA Cloning and Nucleotide Sequencing-As primers for MOPAC cloning (21), the following two mixed oligonucleotides, which contained appropriate restriction sites, were synthesized on a DNA synthesizer (Applied Biosystems).
PRPP is an important substrate for the synthesis of purine, pyrimidine, and pyridine dinucleotides. Human PRS exists as complex aggregates composed of the 34 kDa catalytic subunits(PRS1 and PRS2) and other 39 kDa component designated PRPP synthetase-associated protein (PAP39). PRS superactivity is an X-chromosome linked disorder, characterized by gout and uric acid overproduction resulting from accelerated synthesis of PRPP and purine nucleotides.
A human cDNA encoding 41-kDa phosphoribosylpyrophosphate (PRPP) synthetase (PRS)-associated protein (PAP41) was cloned from two expressed sequence tag (EST) clones having the nucleotide similarity of 61. 5 and 70. 0% to human PAP39 cDNA.
Ishizuka, T. , and Tatibana, M. (1989) J. Biochem. (Tokyo) 105, 736-741), which are termed here PRPP synthetase-associated proteins (PAPs). We have cloned the cDNA for the major one of 39 kDa (PAP39) from a rat liver cDNA library. Nucleotide sequencing showed that the clone encoded 356 amino acids containing sequences of all five peptides derived from PAP39. Surprisingly, the deduced amino acid sequence is markedly similar to those of the 34-kDa catalytic subunits.
Ishizuka, T. , and Tatibana, M. (1989) J. Biochem. (Tokyo) 105, 736-741), which are termed here PRPP synthetase-associated proteins (PAPs). We have cloned the cDNA for the major one of 39 kDa (PAP39) from a rat liver cDNA library. Nucleotide sequencing showed that the clone encoded 356 amino acids containing sequences of all five peptides derived from PAP39.