Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Stereo pair illustrating the proposed His-169···N24 hydrogen bond associated with a strongly tilted D-ring. In this model (model 5 from the corrected 2LB9 P630 ensemble, compare with Ref. 24), the hydrogen bond length is 3.2 Å and the C15=C16 dihedral angle 69°. Hydrophobic interactions with Phe-82 and Val-167 might also be important. (PyMOL image).
