Figure 5
Conformational changes of the [beta]7-[beta]8 hairpin. (a) Overall structure of the triclinic form of PylRS(c270) (PDB entry 3vqx , molecule A). Residues 377-386 in the [beta]7-[beta]8 hairpin are coloured red. (b) A close-up stereoview of the [beta]7-[beta]8 hairpin (boxed region in a). The superpositioned C[alpha] traces of the AMP-bound (red and cyan traces, molecules A and B) and BocLys-AMP-bound forms (yellow and orange traces, molecules C and D) with those of the ligand-free (dark blue trace; PDB entry 2e3c ) and two AMPPNP-bound forms (green and pink traces; PDB entries 2zcd and 2q7e ) are shown. The [beta]7-[beta]8 hairpins (residues 374-390) are coloured. (c) Superposition of the present AMP-bound (and BocLys-AMP-bound) form with the PylRS(c270) structures. Tyr384 in each of the PylRS(c270) forms is shown as a ball-and-stick model. The distances between the main-chain C[alpha] atoms of Tyr residue 384 in molecules A (red), C (yellow) and D (orange) of the present triclinic form and that of the AMPPNP-bound form (pink) are as long as 2.3, 11 and 9.3 Å, respectively.  [article HTML]

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