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MurQ Etherase Is Required by Escherichia coli in Order To Metabolize Anhydro-N-Acetylmuramic Acid Obtained either from the Environment or from Its Own Cell Wall

Department of Molecular Biology and Microbiology, Tufts University School of Medicine, Boston, Massachusetts 02111,¹ Fachbereich Biologie, University of Konstanz, 78457 Konstanz, Germany²

Received 11 August 2005/ Accepted 30 November 2005

MurQ is an N-acetylmuramic acid-phosphate (MurNAc-P) etherase that converts MurNAc-P to N-acetylglucosamine-phosphate and is essential for growth on MurNAc as the sole source of carbon (T. Jaegar, M. Arsic, and C. Mayer, J. Biol. Chem. 280:30100-30106, 2005). Here we show that MurQ is the only MurNAc-P etherase in Escherichia coli and that MurQ and AnmK kinase are required for utilization of anhydro-MurNAc derived either from cell wall murein or imported from the medium.

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