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Título: | Evidence for pentapeptide dependent and independent CheB methylesterases |
Autor: | Velando, Félix CSIC ORCID; Gavira Gallardo, J. A. CSIC ORCID ; Rico-Jiménez, Miriam CSIC ORCID; Matilla, Miguel A. CSIC ORCID; Krell, Tino CSIC ORCID | Palabras clave: | Bacterial signal transduction Chemosensory pathways Chemoreceptors X-ray structure C-terminal pentapeptide CheB Methylesterase |
Fecha de publicación: | 2020 | Editor: | Molecular Diversity Preservation International | Citación: | International Journal of Molecular Sciences 21(22): 8459 (2020) | Resumen: | Many bacteria possess multiple chemosensory pathways that are composed of homologous signaling proteins. These pathways appear to be functionally insulated from each other, but little information is available on the corresponding molecular basis. We report here a novel mechanism that contributes to pathway insulation. We show that, of the four CheB paralogs of Pseudomonas aeruginosa PAO1, only CheB2 recognizes a pentapeptide at the C-terminal extension of the McpB (Aer2) chemoreceptor (KD = 93 µM). McpB is the sole chemoreceptor that stimulates the Che2 pathway, and CheB2 is the methylesterase of this pathway. Pectobacterium atrosepticum SCRI1043 has a single CheB, CheB_Pec, and 19 of its 36 chemoreceptors contain a C-terminal pentapeptide. The deletion of cheB_Pec abolished chemotaxis, but, surprisingly, none of the pentapeptides bound to CheB_Pec. To determine the corresponding structural basis, we solved the 3D structure of CheB_Pec. Its structure aligned well with that of the pentapeptide-dependent enzyme from Salmonella enterica. However, no electron density was observed in the CheB_Pec region corresponding to the pentapeptide-binding site in the Escherichia coli CheB. We hypothesize that this structural disorder is associated with the failure to bind pentapeptides. Combined data show that CheB methylesterases can be divided into pentapeptide-dependent and independent enzymes. | Versión del editor: | http://dx.doi.org/10.3390/ijms21228459 | URI: | http://hdl.handle.net/10261/233742 | DOI: | 10.3390/ijms21228459 | Identificadores: | doi: 10.3390/ijms21228459 issn: 1422-0067 |
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2020_Velando_IJMS_OA.pdf | 3,14 MB | Adobe PDF | Visualizar/Abrir |
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