User:Nikhil Malvankar/Cytochrome nanowires: Difference between revisions
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==Structure Tour== | ==Structure Tour== | ||
<StructureSection size='[250,500]' side='right' caption=" | <StructureSection size='[250,500]' side='right' caption="Geobacter sulfurreducens outer membrane cytochrome S (OmcS) [[6ef8]]." scene='83/835223/Filament/1'> | ||
===Background=== | ===Background=== | ||
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====Histidine to Iron==== | ====Histidine to Iron==== | ||
Each heme <scene name='83/835223/Histidine-iron/1'>iron atom is coordinated by two histidine sidechain nitrogens</scene>, in addition to the four heme nitrogens. The iron of heme 5 (the next to last heme at the carboxy end of the chain) is bound to His 332 from its own chain, and '''His 16''' in the N-terminal "bulge" of the '''next protein chain''' in the filament. This inter-chain histidine-iron bond is undoubtedly important in strengthening the monomer-monomer interfaces in the filament. The histidines bound to hemes 1, 2, 3, 4, and 6 are all in the same protein chain that contains those hemes. | Each heme <scene name='83/835223/Histidine-iron/1'>iron atom is coordinated by two histidine sidechain nitrogens</scene>, in addition to the four heme nitrogens. The iron of heme 5 (the next to last heme at the carboxy end of the chain) is bound to His 332 from its own chain (<font color="#90a0cf">'''Chain A'''</font>), and '''His 16''' in the N-terminal "bulge" of the '''next protein chain''' (<font color="#80cf98">'''Chain B'''</font>) in the filament. This inter-chain histidine-iron bond is undoubtedly important in strengthening the monomer-monomer interfaces in the filament. The histidines bound to hemes 1, 2, 3, 4, and 6 are all in the same protein chain that contains those hemes. | ||