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. Author manuscript; available in PMC: 2012 Oct 15.
Published in final edited form as: Methods. 2009 Aug 3;49(2):148–166. doi: 10.1016/j.ymeth.2009.07.005

Figure 5.

Figure 5

Electrostatic potential surface of the P4–P6 domain from the Tetrahymena group I ribozyme, calculated using the NLPB equation. Regions of negative electrostatic potential appear red, while electropositive regions appear blue. The A-rich bulge that coordinates two Mg2+ ions is located in a pocket of highly negative electrostatic potential (“metal ion core”) with values ranging from −80 to −100 kT/e. [Adapted from (74), with permission.]