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. 2005 Jun;187(12):4042–4049. doi: 10.1128/JB.187.12.4042-4049.2005

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Copyright © 2005, American Society for Microbiology

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FIG. 5. — (A) The expression of ssu-lacZ is negatively controlled by Spx in the presence of sulfate. The strains bearing amyE::ssu₂1_-2₈₉-lacZ (39) in a wild-type, spx, or rpoA^cxs-1 background were grown in TSS containing either sulfate, cysteine, or methionine as the sole sulfur source. Samples were collected and assayed for β-galactosidase activity as described for Fig. 3. Lanes 1, 4, and 7, ORB4891 (ssu₂1_-2₈₉-lacZ); lanes 2, 5, and 8, ORB4896 (ssu₂1_-2₈₉-lacZ rpoA^cxs-1); lanes 3, 6, and 9, ORB4898 (ssu₂1_-2₈₉-lacZ spx). (B) The expression of yxeL-lacZ is negatively controlled by Spx in the presence of sulfate. The strains bearing yxeL-lacZ in a wild-type, spx, or rpoA^cxs-1 background were grown in TSS containing either sulfate, cysteine, or methionine as the sole sulfur source. Samples were collected and assayed for β-galactosidase activity as for Fig. 3. Lanes 1, 4, and 7, ORB4269 (yxeL-lacZ); lanes 2, 5, and 8, ORB4785 (yxeL-lacZ spx); lanes 3, 6, and 9, ORB4786 (yxeL-lacZ rpoA^cxs-1).