= Martyn F. Symmons
{c}
= M. F. Symmons
{c}
{synonym}
Martyn F. Symmons is the first-named author of a 2000 structural study of <polynucleotide phosphorylase>. The collaborators' subsequent account gives his full byline, preserving the connection to the original M. F. Symmons credit.<Running rings around RNA: a superfamily of phosphate-dependent RNases by Martyn F. Symmons and others>[Full byline]{ref}
The structure showed a duplicated core within each <protein subunit> and a three-subunit assembly. Bound <tungstate>, a <phosphate> analogue, helped identify a catalytic region; the structure did not contain bound <RNA>.<A duplicated fold is the structural basis for polynucleotide phosphorylase catalytic activity, processivity, and regulation by M. F. Symmons and others>[Abstract: duplicated architecture and tungstate derivative]{ref}
A simple counting example clarifies the architectural claim. A <protein trimer> with two related core <protein domains> per chain contains $3\times2=6$ such domains but only three chains. The domain count alone does not establish six equivalent <active sites>. A repeated fold can retain a similar shape while acquiring a different catalytic or structural role.
This distinction suggests an experimental comparison: locate a bound chemical analogue, identify nearby <amino acid residues>, then compare functional measurements after controlled changes while independently checking <protein folding>. A loss of activity after global unfolding would not isolate the role of one <active site>. This is a general interpretation of the structural strategy, rather than an assignment of particular experiments to Symmons solely from author order.
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