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. Author manuscript; available in PMC: 2010 Jun 1.
Published in final edited form as: J Struct Biol. 2009 Mar 24;166(3):303–315. doi: 10.1016/j.jsb.2009.03.009

Figure 6. Calcium binding site in the dimer interface of V. cholerae cyto1-EpsF56-171.

Figure 6

Calcium is coordinated as an approximate tetragonal bipyramid by Glu 97 from chain A, and Glu 151 and Asp 155 from chain B, and three water molecules. Asp 155 is binding the calcium ion in a bidentate manner. Arg 73 forms a salt bridge with both Glu 151 and Asp 155. Glu 151 has an additional hydrogen bond with Gln 80. The calcium ion is surrounded by anomalous Fourier electron density contoured at 7.5 sigma colored in gold.