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. Author manuscript; available in PMC: 2012 Feb 1.
Published in final edited form as: Proteins. 2011 Feb;79(2):537–546. doi: 10.1002/prot.22901

FIG. 7.

FIG. 7

Movements of the β20/β21 strand relative to the core as measured by the distance G431.CA-T257.CA, during TMD and post-TMD equlibrations. The small arrow at 16.95 Å shows the value of the metric in the CD4-bound crystal structure (1GC1) of gp120. The vertical line indicates the transition from TMD to equilibration.