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Figure 1.
Figure 1. Experimental Electron Density Map after Density
ModificationDensity-modified experimental electron density for
α helices α3 and α4 and the connecting loop contoured at 1.4
σ. The final, refined model is shown using a ball-and-stick
representation. The α helices, loop, and most side chains are
clearly visible in the initial map. The buried residues Gly-57,
Phe-60, Ala-83, and Phe-87, which are conserved in the
representative SNAP sequences (Figure 3A), are depicted in red.
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