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. Author manuscript; available in PMC: 2016 Sep 1.
Published in final edited form as: Methods Enzymol. 2015 Sep 26;564:219–258. doi: 10.1016/bs.mie.2015.08.018

Figure 2.

Figure 2

Structures of the nitroxide side chains produced by reactions of the sulfhydryl group of a cysteine residue with common spin labels. (A) (1-oxyl-2,2,5,5-tetramethylpyrroline-3-methyl)methanethiosulfonate [MTSL], 1; (B) 3-(2-iodoacetamido)-2,2,5,5-tetramethyl-1-pyrrolidinyl-1-oxyl [3-(2-iodoacetamido)-PROXYL], 4; and (C) 3-maleimido-2,2,5,5-tetramethyl-1-pyrrolidinyl-1-oxyl [3-maleimido-PROXYL], 7.