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Two views of suggested NMP binding within the AcrB binding state protomer (PDB code 2HRT; www.rcsb.org/pdb). Binding pocket side chains are in yellow, residues detected from random mutagenesis are cyan sticks, and glycines are cyan spheres. The NMP molecule is in magenta. The dotted black line indicates a putative hydrogen bond. Oxygen is in red, nitrogen is blue, and hydrogen is white. Images were created using PyMOL (www.pymol.org).
