creators_name: Saxena, Rahul creators_name: Chakraborti, Pradip K type: article datestamp: 2012-01-09 04:29:30 lastmod: 2012-01-09 04:29:30 metadata_visibility: show title: The carboxy-terminal end of the peptide deformylase from Mycobacterium tuberculosis is indispensable for its enzymatic activity. ispublished: pub subjects: QD full_text_status: restricted note: Copyright of this article belongs to Elsevier Science. abstract: The peptide deformylase in bacteria is involved in removal of N-formyl group from newly synthesized proteins. The gene encoding this enzyme from Mycobacterium tuberculosis was cloned and expressed in Escherichia coli. The enzyme activity of the recombinant protein (mPDF) was insensitive to modulation by common monovalent/divalent cations. Kinetic analysis, using N-formylmethionine-alanine as the substrate, yielded K(cat)/K(m) of approximately 1220 M(-1)s(-1). Actinonin, a naturally occurring antibiotic, and 1,10-ortho-phenanthroline strongly inhibited the enzyme activity. The mPDF was very stable at 30 degrees C with a half-life of approximately 4h and exhibited resistance to oxidizing agents, like H(2)O(2). Thus, the mPDF achieved distinction in its behavior among any reported iron-containing peptide deformylases. Furthermore, amino acid sequence analysis of mPDF revealed the presence of an unusually long carboxy-terminal end (residues 182-197), which is atypical for any gram-positive bacteria. Our results, through deletion analysis, for the first time established the role of this region in mPDF enzyme activity. date: 2005-07-01 date_type: published publication: Biochemical and biophysical research communications volume: 332 number: 2 publisher: Elsevier Science pagerange: 418-25 refereed: TRUE issn: 0006-291X official_url: http://www.sciencedirect.com/science/article/pii/S0006291X05008739 related_url_url: http://www.sciencedirect.com/science/article/pii/S0006291X05008739 related_url_type: pub citation: Saxena, Rahul and Chakraborti, Pradip K (2005) The carboxy-terminal end of the peptide deformylase from Mycobacterium tuberculosis is indispensable for its enzymatic activity. Biochemical and biophysical research communications, 332 (2). pp. 418-25. ISSN 0006-291X document_url: http://crdd.osdd.net/open/175/1/chakraborti2005.pdf