Staphylococcal γ-haemolysin HlgA–HlgB forms a β-barrel transmembrane pore in cells and in model membranes. The pore is formed by the oligomerization of two different proteins and a still debated number of monomers. To clarify the topology of the pore, we have mutated single residues – placed near the right and left interfaces of each monomer into cysteine. The mutants were labelled with fluorescent probes, forming a donor–acceptor pair for FRET (fluorescence resonance energy transfer). Heterologous couples (labelled on complementary left and right interfaces) displayed a marked FRET, suggesting extensive HlgA–HlgB or HlgB–HlgA contacts. Heterologous control couples (with both components labelled on the same side) showed absent or low FRET. We found the same result for the homologous couple formed by HlgA [i.e. HlgA–HlgA in the presence of wt (wild-type) HlgB]. The homologous HlgB couple (HlgB–HlgB labelled on left and right interfaces and in the presence of wt HlgA) displayed a transient, declining FRET, which may indicate fast formation of an intermediate that is consumed during pore formation. We conclude that bicomponent pores are assembled by alternating heterologous monomers.
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Research Article|
January 27 2006
Homologous versus heterologous interactions in the bicomponent staphylococcal γ-haemolysin pore1
Gabriella Viero;
Gabriella Viero
2
*Istituto Trentino di Cultura (ITC) and Consiglio Nazionale delle Ricerche (CNR), Istituto di Biofisica, Sezione di Trento, Via Sommarive 18, I-38050 Povo (TN), Italy
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Romina Cunaccia;
Romina Cunaccia
2
*Istituto Trentino di Cultura (ITC) and Consiglio Nazionale delle Ricerche (CNR), Istituto di Biofisica, Sezione di Trento, Via Sommarive 18, I-38050 Povo (TN), Italy
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Gilles Prévost;
Gilles Prévost
†Institut de Bactériologie de la Faculté de Médecine, UPRES EA-3432, ULP-HUS, 3 rue Koeberlé, F-67000 Strasbourg, France
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Sandra Werner;
Sandra Werner
3
†Institut de Bactériologie de la Faculté de Médecine, UPRES EA-3432, ULP-HUS, 3 rue Koeberlé, F-67000 Strasbourg, France
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Henri Monteil;
Henri Monteil
†Institut de Bactériologie de la Faculté de Médecine, UPRES EA-3432, ULP-HUS, 3 rue Koeberlé, F-67000 Strasbourg, France
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Daniel Keller;
Daniel Keller
†Institut de Bactériologie de la Faculté de Médecine, UPRES EA-3432, ULP-HUS, 3 rue Koeberlé, F-67000 Strasbourg, France
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Olivier Joubert;
Olivier Joubert
†Institut de Bactériologie de la Faculté de Médecine, UPRES EA-3432, ULP-HUS, 3 rue Koeberlé, F-67000 Strasbourg, France
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Gianfranco Menestrina;
Gianfranco Menestrina
*Istituto Trentino di Cultura (ITC) and Consiglio Nazionale delle Ricerche (CNR), Istituto di Biofisica, Sezione di Trento, Via Sommarive 18, I-38050 Povo (TN), Italy
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Mauro Dalla Serra
Mauro Dalla Serra
4
*Istituto Trentino di Cultura (ITC) and Consiglio Nazionale delle Ricerche (CNR), Istituto di Biofisica, Sezione di Trento, Via Sommarive 18, I-38050 Povo (TN), Italy
4To whom correspondence should be addressed (email mdalla@itc.it).
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Publisher: Portland Press Ltd
Received:
July 26 2005
Revision Received:
September 19 2005
Accepted:
October 24 2005
Accepted Manuscript online:
October 24 2005
Online ISSN: 1470-8728
Print ISSN: 0264-6021
The Biochemical Society, London
2006
Biochem J (2006) 394 (1): 217–225.
Article history
Received:
July 26 2005
Revision Received:
September 19 2005
Accepted:
October 24 2005
Accepted Manuscript online:
October 24 2005
Citation
Gabriella Viero, Romina Cunaccia, Gilles Prévost, Sandra Werner, Henri Monteil, Daniel Keller, Olivier Joubert, Gianfranco Menestrina, Mauro Dalla Serra; Homologous versus heterologous interactions in the bicomponent staphylococcal γ-haemolysin pore1. Biochem J 15 February 2006; 394 (1): 217–225. doi: https://doi.org/10.1042/BJ20051210
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