5t56 | pdb_00005t56
[3]catenane from MccJ25 G12R/I13C/G21C lasso peptide
Structural highlights
Function[MCJA_ECOLX] Peptide antibiotic that functions through inhibition of the bacterial DNA-dependent RNA polymerase (RNAP). May inhibit transcription by binding in RNAP secondary channel and blocking nucleotide substrates access to the catalytic center. Exhibits potent bacteriocidal activity against a range of Enterobacteriaceae, including several pathogenic E.coli, Salmonella and Shigella strains. Also acts on the cytoplasmic membrane of Salmonella newport, producing alteration of membrane permeability and disruption of the subsequent gradient dissipation, which inhibits several processes essential for cell viability, such as oxygen consumption. Induces bacterial filamentation in susceptible cells in a non-SOS-dependent way, but this phenotype may result from impaired transcription of genes coding for cell division proteins.[1] [2] [3] Publication Abstract from PubMedLasso peptides exist naturally in a threaded state as [1]rotaxanes, and we reasoned that lasso peptides cleaved in their loop region could serve as building blocks for catenanes. Mutagenesis of the lasso peptide microcin J25 (MccJ25) with two cysteine residues followed by cleavage of the peptide with trypsin led to a [2]rotaxane structure that self-assembled into a [3]catenane and [4]catenanes at room temperature in aqueous solution. The [3]catenane represents the smallest ring size of a catenane composed solely of polypeptide segments. The NMR structure of the [3]catenane was determined, suggesting that burial of hydrophobic residues may be a driving force for assembly of the catenane structure. Self-Assembly of Catenanes from Lasso Peptides.,Allen CD, Link AJ J Am Chem Soc. 2016 Nov 2;138(43):14214-14217. Epub 2016 Oct 21. PMID:27768305[4] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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