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CTQ and surrounding residues in the crystal structure of GoxA (PDB entry 6BYW). Most of CTQ is surrounded by a hydrophobic pocket formed by Trp696, Tyr578 Val586 and His583, except for the quinone oxygen at the C6 position, which is exposed to the solvent. The other quinone oxygen at the C7 position forms a hydrogen bond with backbone amide hydrogen of His583.
