By Alton Meister
Advances in Enzymology and comparable parts of Molecular Biology is a seminal sequence within the box of biochemistry, providing researchers entry to authoritative stories of the newest discoveries in all parts of enzymology and molecular biology. those landmark volumes date again to 1941, delivering an unmatched view of the ancient improvement of enzymology. The sequence bargains researchers the most recent knowing of enzymes, their mechanisms, reactions and evolution, roles in advanced organic strategy, and their software in either the laboratory and undefined. each one quantity within the sequence positive factors contributions via major pioneers and investigators within the box from world wide. All articles are rigorously edited to make sure thoroughness, caliber, and clarity.
With its wide selection of issues and lengthy ancient pedigree, Advances in Enzymology and similar components of Molecular Biology can be utilized not just via scholars and researchers in molecular biology, biochemistry, and enzymology, but in addition by means of any scientist attracted to the invention of an enzyme, its houses, and its functions.
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Extra resources for Advances in Enzymology and Related Areas of Molecular Biology, Volume 39
It is of particular interest that the less stable anhydride is formed more rapidly and in larger amounts. An anhydride linkage involving the nitrogen at N-b is an unusual feature of the structure of anhydride 1. The main evidence for this is twofold; (a) a significant shift in the resonance position of the C-5 protons, not seen in anhydride 11, and (b) protonation on nitrogen (revealed by area integration of spectra taken in strong acid), indicating that the imino nitrogen at N-c becomes protonated.
The relative rates were such as to exclude a compulsory binding order in which tRNA binding precedes that of any other substrate, a possibility previously suggested (8 1). Mehler and Mitra (82) have observed that arginyl-tRNA synthetase does not catalyze an arginine-dependent 82PP,-ATP exchange except in the presence of arginine-specific tRNA. Catalysis of the reverse reaction, pyrophosphorolysis of arginyl adenylate, also has this requirement. They suggest that tRNA binding is required for conformational reasons in the activation, that is, for arginyl adeny- ENZYMES OF ARGININE AND UREA SYNTHESIS 25 late formation.
Arginases from Rat and Bovine Liver It is of interest to compare the properties of two highly purified arginases, one prepared from bovine liver (128) and the other from rat liver (127). These are the most common sources of the enzyme for experimental purposes. The molecular weights (Table XI) do not differ appreciably, but the rat liver enzyme is a more basic protein; the difference in p l can be correlated with differences in the amino acid composition. The rat enzyme is much the more stable of the two during isoelectric focusing, exposure to acid pH, and dialysis to remove Mn", and is composed of 4 subunits (127).
Advances in Enzymology and Related Areas of Molecular Biology, Volume 39 by Alton Meister