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Significance of sMMOH helix F and hypothesis for bifurcated O2 and methane entry into the sMMOH active site. An overlay of 7S6Q and 7S6T is shown. The key F helix is shown in light red with shifting positions of R245 and M247 indicated by blue arrows. Tunnels W308 1 and 2 are shown in cyan and yellow, respectively. The active site is depicted by the orange spheres of the diiron cluster. Color legend: sMMOH = green and sulfur, DBL2 MMOB = wheat, H33A MMOB = deep salmon.
