George H. Jones
= George H. Jones
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= G. H. Jones
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{synonym}
George H. Jones coauthored structural and biochemical work on <polynucleotide phosphorylase>. The initial-only 2000 byline G. H. Jones is supplemented by the full byline in the collaborators' 2002 account and in a 2003 paper on enzyme purification.<Running rings around RNA: a superfamily of phosphate-dependent RNases by Martyn F. Symmons and others>[Full byline]{ref}<Overexpression and purification of untagged polynucleotide phosphorylases by George H. Jones and others>[Full byline]{ref}
The 2003 work separated purified <enzyme> activity from possible contaminating nuclease activity by testing the dependence of degradation on <phosphate>. That distinction matters because <polynucleotide phosphorylase> uses <phosphorolysis>, whereas an unrelated hydrolytic nuclease could also make intact <RNA> disappear.<Overexpression and purification of untagged polynucleotide phosphorylases by George H. Jones and others>[Abstract: phosphate-independent nuclease control and phosphorolysis/polymerization assays]{ref}
For an original control calculation, suppose intact-<RNA> signal falls by $30$ units with <phosphate> and by $8$ without it. Subtraction gives an increment of $22$ units associated with the changed condition. Interpreting all $30$ units as phosphate-dependent activity would ignore the background. Even the subtraction requires comparable samples, linear response and unchanged background behavior; it is not automatically a molecular rate measurement.
The shared 2000 <X-ray crystallography> paper supplied another kind of evidence: the architecture of a three-subunit <protein complex>. A structure can suggest where <substrate> recognition occurs, while biochemical controls test what chemical reaction the preparation actually performs.<A duplicated fold is the structural basis for polynucleotide phosphorylase catalytic activity, processivity, and regulation by M. F. Symmons and others>[Abstract: trimeric architecture and catalytic-site interpretation]{ref}