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. Author manuscript; available in PMC: 2009 Mar 11.
Published in final edited form as: Biochemistry. 2009 Feb 3;48(4):738–743. doi: 10.1021/bi801976r

Figure 1.

Figure 1

Q241, Q242 and N245 line the potential periplasmic pathway of LacY. A. LacY is viewed perpendicular to the membrane with the N-terminal helix bundle on the left and the C-terminal bundle on the right. B. LacY is viewed from periplasmic side of the membrane with the N-terminal helix bundle on the left and the C-terminal bundle on the right. Cys replacements (Q241C, Q242C and N245C) at their respective positions are shown as spheres on the backbone of C154G LacY (Protein Data Bank ID code 1PV7; www.pdb.org). Sulfur atoms are shown in yellow. Helices I (blue), II (purple) and XI (light brown) are labeled and shown as surfaces; helix VII (red) is shown as cartoon.