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Journal of Bacteriology, June 1999, p. 3842-3844, Vol. 181, No. 12
0021-9193/99/$04.00+0

Identification of Two New Proteins in Spermidine Nucleoids Isolated from Escherichia coli

Lizabeth D. Murphy, Judah L. Rosner, Steven B. Zimmerman,* and Dominic Esposito

Laboratory of Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892-0560

Received 9 February 1999/Accepted 14 April 1999

The Escherichia coli nucleoid contains DNA in a condensed but functional form. Analysis of proteins released from isolated spermidine nucleoids after treatment with DNase I reveals significant amounts of two proteins not previously detected in wild-type E. coli. Partial amino-terminal sequencing has identified them as the products of rdgC and yejK. These proteins are strongly conserved in gram-negative bacteria, suggesting that they have important cellular roles.

* Corresponding author. Mailing address: Laboratory of Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bldg. 5, Room 328W, 5 Center Dr. MSC0560, Bethesda, MD 20892-0560. Phone: (301) 496-2208. Fax: (301) 496-0201. E-mail: stevenz{at}bdg5.niddk.nih.gov.

Journal of Bacteriology, June 1999, p. 3842-3844, Vol. 181, No. 12
0021-9193/99/$04.00+0


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