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GNM mode 1 indicates that chain G (pentamer forming chain) is the
most mobile in prohead II and undergoes a dramatic decrease in
mobility. Figures colored by mobility (red most mobile, blue least
mobile), left is from the prohead II and right is from the head II
structure. Below, the major difference in mobility upon maturation
is seen to be in the E-loop (residues 148-181). This loop contains
the residue Lys189 that forms an isopeptide bond with Asn356 of a
neighboring chain in the mature form.
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