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. Author manuscript; available in PMC: 2009 Jul 1.
Published in final edited form as: Bioconjug Chem. 2008 Jun 24;19(7):1339–1341. doi: 10.1021/bc800118j

Figure 1.

Figure 1

The optical switch in single-ring GroEL (SR1) molecules. (A) The fluorescence of the oxazine dye at position 327 (in red) is quenched by Trp44 (in violet) in the T conformation of GroEL. (B) In the R’ conformation, the quenching is removed. The structures shown in A and B are those of two adjacent subunits in the trans and cis rings, respectively, of the GroEL-GroES-ADP7 complex (9).