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A major determinant for gliding motility in Mycoplasma genitalium: The interaction between the terminal organelle proteins MG200 and MG491

AutorMartinelli, Luca; Lalli, Daniela; Garcia-Morales, Luis; Ratera, Mercè ; Querol, Enrique; Piñol, Jaume; Fita, Ignacio ; Calisto, Barbara M.
Palabras claveStructural Biology
Protein-Protein Interaction
Cell Motility
Nuclear Magnetic Resonance (NMR)
Protein Structure
Fecha de publicación16-ene-2015
EditorAmerican Society for Biochemistry and Molecular Biology
CitaciónJournal of Biological Chemistry 290(3): 1699-1711 (2015)
Resumen© 2015 by The American Society for Biochemistry and Molecular Biology, Inc. Several mycoplasmas, such as the emergent human pathogen Mycoplasma genitalium, developed a complex polar structure, known as the terminal organelle (TO), responsible for a new type of cellular motility, which is involved in a variety of cell functions: cell division, adherence to host cells, and virulence. The TO cytoskeleton is organized as a multisubunit dynamic motor, including three main ultrastructures: the terminal button, the electrodense core, and the wheel complex. Here, we describe the interaction between MG200 and MG491, two of the main components of the TO wheel complex that connects the TO with the cell body and the cell membrane. The interaction between MG200 and MG491 has a KD in the 80 nM range, as determined by surface plasmon resonance. The interface between the two partners was confined to the >enriched in aromatic and glycine residues> (EAGR) box of MG200, previously described as a protein-protein interaction domain, and to a 25-residue-long peptide from the C-terminal region of MG491 by surface plasmon resonance and NMR spectroscopy studies. An atomic description of the MG200 EAGR box binding surface was also provided by solution NMR. An M. genitalium mutant lacking the MG491 segment corresponding to the peptide reveals specific alterations in cell motility and cell morphology indicating that the MG200-MG491 interaction plays a key role in the stability and functioning of the TO.
Versión del editorhttp://dx.doi.org/10.1074/jbc.M114.594762
Identificadoresdoi: 10.1074/jbc.M114.594762
issn: 1083-351X
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