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. 2004 Sep;87(3):2043–2059. doi: 10.1529/biophysj.103.038497

FIGURE 1.

FIGURE 1

Charged residues and electrostatic fields on Phormidium cyt f and PC. Heme (black); Y1 on cyt f and Y83 on PC (yellow); H87 on PC (green); Arg (dark blue); Lys (light blue); Glu (red); and Asp (magenta). Electrostatic field contours: +1 kT/e− (blue); and −1 kT/e (red). Electrostatic fields were calculated using GRASP (Nicholls and Honig, 1991). PC residues are numbered as in Bond et al. (1999). (A) WT cyt f; (B) WT PC plus Zn2+ (C) WT PC minus Zn2+; and (D) quadruple PC mutant (D44A + D45A + E54A + D57A) minus Zn2+.