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Figure 3
In crystal form 2, the central helix is bent by 40°, and the side chain of Arg86 flips inwards to distort hydrogen bonding in the helix backbone. (a) In the monomer with a straight central helix (cyan), Arg86 is stacked against Tyr138, but it hydrogen-bonds to the backbone amide of Thr79 in the bent conformation (magenta). (b) 2Fo − Fc density for Arg86 in the bent chain contoured at 1σ.

Journal logoBIOLOGICAL
CRYSTALLOGRAPHY
ISSN: 1399-0047
Volume 70| Part 1| December 2014| Pages 24-30
doi:10.1107/S1399004713024437
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