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. Author manuscript; available in PMC: 2012 Jun 10.
Published in final edited form as: Biochemistry. 2011 Oct 12;50(44):9421–9423. doi: 10.1021/bi201487b

Figure 2.

Figure 2

Tyr7 protonated in the pH 7.8 structure, and can act as a bifurcated H-bond donor to W3a and W1003. Positive 2Fo−Fc nuclear maps are shown in green (contoured at 1.5s) with the negative 2Fo−Fc nuclear map shown in red (contoured at 2.0s), indicating the unexchanged/non-labile H density.