Functional and structural study of the dimeric inner membrane protein SbmA (Articolo in rivista)

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Label
  • Functional and structural study of the dimeric inner membrane protein SbmA (Articolo in rivista) (literal)
Anno
  • 2013-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1128/JB.00824-13 (literal)
Alternative label
  • Corbalan N, Runti G, Adler C, Covaceuszach S, Ford R, Lamba D, Beis K, Scocchi M, Vincent PA (2013)
    Functional and structural study of the dimeric inner membrane protein SbmA
    in Journal of bacteriology (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Corbalan N, Runti G, Adler C, Covaceuszach S, Ford R, Lamba D, Beis K, Scocchi M, Vincent PA (literal)
Pagina inizio
  • 5352 (literal)
Pagina fine
  • 5361 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 195 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 10 (literal)
Note
  • PubMe (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Instituto Superior de Investigaciones Biológica, INSIBIO- CONICET, Universidad Nacional de Tucumán, San Miguel de Tucumán, Tucumán, Argentina Department of Life Sciences, University of Trieste, Trieste, Italy Istituto di Cristallografia, Consiglio Nazionale delle Ricerche, U.O.S di Trieste, Trieste, Italy Faculty of Life Sciences, University of Manchester, Manchester Interdisciplinary Biocentre, Manchester, United Kingdom Division of Molecular Biosciences, Imperial College London, South Kensington, London, United Kingdom Membrane Protein Lab, Diamond Light Source, Harwell Science and Innovation Campus, Chilton, Oxfordshire, United Kingdom Rutherford Appleton Laboratory, Research Complex at Harwell, Didcot, Oxfordshire, United Kingdomg (literal)
Titolo
  • Functional and structural study of the dimeric inner membrane protein SbmA (literal)
Abstract
  • SbmA protein has been proposed as a dimeric secondary transporter. The protein is involved in the transport of microcins B17 and J25, bleomycin, proline-rich antimicrobial peptides, antisense peptide phosphorodiamidate morpholino oligomers, and peptide nucleic acids into the Escherichia coli cytoplasm. The sbmA homologue is found in a variety of bacteria, though the physiological role of the protein is hitherto unknown. In this work, we carried out a functional and structural analysis to determine which amino acids are critical for the transport properties of SbmA. We created a set of 15 site-directed sbmA mutants in which single conserved amino acids were replaced by glycine residues. Our work demonstrated that strains carrying the site-directed mutants V102G, F219G, and E276G had a null phenotype for SbmA transport functions. In contrast, strains carrying the single point mutants W19G, W53G, F60G, S69G, N155G, R190, L233G, A344G, T255G, N308G, and R385G showed transport capacities indistinguishable from those of strains harboring a wild-type sbmA. The strain carrying the Y116G mutant exhibited mixed phenotypic characteristics. We also demonstrated that those sbmA mutants with severely impaired transport capacity showed a dominant negative phenotype. Electron microscopy data and in silico three-dimensional (3D) homology modeling support the idea that SbmA forms a homodimeric complex, closely resembling the membrane-spanning region of the ATP-binding cassette transporter family. Direct mapping of the sbmA single point mutants on the protein surface allowed us to explain the observed phenotypic differences in transport ability. (literal)
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