IscR, an Fe-S cluster-containing transcription factor, represses expression of Escherichia coli genes encoding Fe-S cluster assembly proteins

Schwartz CJ, Giel JL, Patschkowski T, Luther C, Ruzicka FJ, Beinert H, Kiley PJ (2001)
Proc Natl Acad Sci U S A 98(26) 98(26): 14895-14900.

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Schwartz, C.J.; Giel, J.L.; Patschkowski, ThomasUniBi; Luther, C.; Ruzicka, F.J.; Beinert, H.; Kiley, P.J.
Abstract / Bemerkung
scR (iron-sulfur cluster regulator) is encoded by an ORF located immediately upstream of genes coding for the Escherichia coli Fe-S cluster assembly proteins, IscS, IscU, and IscA. IscR shares amino acid similarity with MarA, a member of the MarA/SoxS/Rob family of transcription factors. In this study, we found that IscR functions as a repressor of the iscRSUA operon, because strains deleted for iscR have increased expression of this operon. In addition, in vitro transcription reactions established a direct role for IscR in repression of the iscR promoter. Analysis of IscR by electron paramagnetic resonance showed that the anaerobically isolated protein contains a [2Fe-2S](1+) cluster. The Fe-S cluster appears to be important for IscR function, because repression of iscR expression is significantly reduced in strains containing null mutations of the Fe-S cluster assembly genes iscS or hscA. The finding that IscR activity is decreased in strain backgrounds in which Fe-S cluster assembly is impaired suggests that this protein may be part of a novel autoregulatory mechanism that senses the Fe-S cluster assembly status of cells.
Proc Natl Acad Sci U S A 98(26)
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Schwartz CJ, Giel JL, Patschkowski T, et al. IscR, an Fe-S cluster-containing transcription factor, represses expression of Escherichia coli genes encoding Fe-S cluster assembly proteins. Proc Natl Acad Sci U S A 98(26). 2001;98(26):14895-14900.
Schwartz, C. J., Giel, J. L., Patschkowski, T., Luther, C., Ruzicka, F. J., Beinert, H., & Kiley, P. J. (2001). IscR, an Fe-S cluster-containing transcription factor, represses expression of Escherichia coli genes encoding Fe-S cluster assembly proteins. Proc Natl Acad Sci U S A 98(26), 98(26), 14895-14900.
Schwartz, C.J., Giel, J.L., Patschkowski, Thomas, Luther, C., Ruzicka, F.J., Beinert, H., and Kiley, P.J. 2001. “IscR, an Fe-S cluster-containing transcription factor, represses expression of Escherichia coli genes encoding Fe-S cluster assembly proteins”. Proc Natl Acad Sci U S A 98(26) 98 (26): 14895-14900.
Schwartz, C. J., Giel, J. L., Patschkowski, T., Luther, C., Ruzicka, F. J., Beinert, H., and Kiley, P. J. (2001). IscR, an Fe-S cluster-containing transcription factor, represses expression of Escherichia coli genes encoding Fe-S cluster assembly proteins. Proc Natl Acad Sci U S A 98(26) 98, 14895-14900.
Schwartz, C.J., et al., 2001. IscR, an Fe-S cluster-containing transcription factor, represses expression of Escherichia coli genes encoding Fe-S cluster assembly proteins. Proc Natl Acad Sci U S A 98(26), 98(26), p 14895-14900.
C.J. Schwartz, et al., “IscR, an Fe-S cluster-containing transcription factor, represses expression of Escherichia coli genes encoding Fe-S cluster assembly proteins”, Proc Natl Acad Sci U S A 98(26), vol. 98, 2001, pp. 14895-14900.
Schwartz, C.J., Giel, J.L., Patschkowski, T., Luther, C., Ruzicka, F.J., Beinert, H., Kiley, P.J.: IscR, an Fe-S cluster-containing transcription factor, represses expression of Escherichia coli genes encoding Fe-S cluster assembly proteins. Proc Natl Acad Sci U S A 98(26). 98, 14895-14900 (2001).
Schwartz, C.J., Giel, J.L., Patschkowski, Thomas, Luther, C., Ruzicka, F.J., Beinert, H., and Kiley, P.J. “IscR, an Fe-S cluster-containing transcription factor, represses expression of Escherichia coli genes encoding Fe-S cluster assembly proteins”. Proc Natl Acad Sci U S A 98(26) 98.26 (2001): 14895-14900.

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