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What does P-GS stand for?

P-GS stands for o-Phosphotyrosyl glutamine synthetase

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The products on micrococcal nuclease digestion were adenosine and o-phosphotyrosyl glutamine synthetase. The Km for this macromolecular substrate with the nuclease was 40 µM, at pH 8. 9. The glutamine synthetase activity was not affected by deadenosylation with the nuclease, in contrast to SVPDE digestion, with which the glutamine synthetase activity was markedly increased.
The products on micrococcal nuclease digestion were adenosine and o-phosphotyrosyl glutamine synthetase. The Km for this macromolecular substrate with the nuclease was 40 microM, at pH 8. 9. The glutamine synthetase activity was not affected by deadenosylation with the nuclease, in contrast to SVPDE digestion, with which the glutamine synthetase activity was markedly increased. The Km for the native adenylylated glutamine synthetase with the SVPDE was 36 microM, i.
o-Phosphotyrosyl glutamine synthetase: modification of the nucleotide ligation site of adenylylated glutamine synthetase.
[Show abstract] [Hide abstract] ABSTRACT: o-Phosphotyrosyl glutamine synthetase (P-GS) was isolated from highly adenylated glutamine synthetase (AMP-GS) purified from Mycobacterium phlei, by treatment with micrococcal nuclease. The physical characteristics of P-GS were quite similar to those of AMP-GS except for the UV-absorption spectrum. In either Mg2+- or Mn2+-dependent biosynthetic reactions, the kinetic properties, such as optimum pH, Vmax, and apparent Km for each of three substrates of P-GS, were found to be in good agreement with those of AMP-GS.