title: MSMEG_4626 ribonuclease from Mycobacterium smegmatis.
abstract: The MSMEG_4626 gene was cloned from Mycobacterium smegmatis MC2 155. It codes for a protein of 1,037 amino acids, identified as ribonuclease E by matching to the protein family HMM TIGR00757. The protein was expressed and purified. Although its calculated molecular weight is 112.7 kDa, it has an aberrant mobility in SDS-polyacrylamide gels, like other ribonuclease E enzymes (it migrates as a 180 kDa protein). The central part of the protein displays high similarity to the catalytic domains of other RNase E enzymes. Mass spectrometric analysis revealed the presence of the chaperonin GroEL, ribosomal proteins, a negative regulator of genetic competence and GTP pyrophosphokinase in the affinity-purified preparation. It is a very unstable protein; despite the use of protease inhibitors in addition to the full-length RNase E its proteolytic fragments were detected.
authors.affiliation: Department of Medical Microbiology, University of Szeged, Szeged, Hungary.
authors.forename: Agnes
authors.initials: A
authors.lastname: Csanadi
authors.forename: Ildiko
authors.initials: I
authors.lastname: Faludi
authors.forename: Andras
authors.initials: A
authors.lastname: Miczak
mesh_terms: D001426:Bacterial Proteins / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D004591:Electrophoresis, Polyacrylamide Gel; D004722:Endoribonucleases / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D004926:Escherichia coli / Q000235:genetics; D006639:Histidine / Q000235:genetics / Q000378:metabolism; D020102:Mycobacterium smegmatis / Q000201:enzymology* / Q000235:genetics; D009842:Oligopeptides / Q000235:genetics / Q000378:metabolism; D011993:Recombinant Fusion Proteins / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism
chemical_list: D001426:Bacterial Proteins; C471213:His-His-His-His-His-His; D009842:Oligopeptides; D011993:Recombinant Fusion Proteins; D006639:Histidine; D004722:Endoribonucleases; C022537:ribonuclease E