Por favor, use este identificador para citar o enlazar a este item:
http://hdl.handle.net/10261/123942COMPARTIR / EXPORTAR:
 SHARE
 CORE
BASE
|
|
| Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE | |
| Título: | Eukaryotic Catalase-Peroxidase: The Role of the Trp-Tyr-Met Adduct in Protein Stability, Substrate Accessibility, and Catalysis of Hydrogen Peroxide Dismutation |
Autor: | Gasselhuber, Bernhard; Carpena, Xavi CSIC ORCID; Fita, Ignacio CSIC ORCID ; Obinger, Christian | Fecha de publicación: | 8-sep-2015 | Editor: | American Chemical Society | Citación: | Biochemistry 54(35): 5425-5438 (2015) | Resumen: | © 2015 American Chemical Society. Recently, it was demonstrated that bifunctional catalase-peroxidases (KatGs) are found not only in archaea and bacteria but also in lower eukaryotes. Structural studies and preliminary biochemical data of the secreted KatG from the rice pathogen Magnaporthe grisea (MagKatG2) suggested both similar and novel features when compared to those of the prokaryotic counterparts studied so far. In this work, we demonstrate the role of the autocatalytically formed redox-active Trp140-Tyr273-Met299 adduct of MagKatG2 in (i) the maintenance of the active site architecture, (ii) the catalysis of hydrogen peroxide dismutation, and (iii) the protein stability by comparing wild-type MagKatG2 with the single mutants Trp140Phe, Tyr273Phe, and Met299Ala. The impact of disruption of the covalent bonds between the adduct residues on the spectral signatures and heme cavity architecture was small. By contrast, loss of its integrity converts bifunctional MagKatG2 to a monofunctional peroxidase of significantly reduced thermal stability. It increases the accessibility of ligands due to the increased flexibility of the KatG-typical large loop 1 (LL1), which contributes to the substrate access channel and anchors at the adduct Tyr. We discuss these data with respect to those known from prokaryotic KatGs and in addition present a high-resolution structure of an oxoiron compound of MagKatG2. | Descripción: | Bernhard Gasselhuber et al. | Versión del editor: | http://dx.doi.org/10.1021/acs.biochem.5b00831 | URI: | http://hdl.handle.net/10261/123942 | DOI: | 10.1021/acs.biochem.5b00831 | Identificadores: | doi: 10.1021/acs.biochem.5b00831 issn: 1520-4995 |
| Aparece en las colecciones: | (IBMB) Artículos |
Ficheros en este ítem:
| Fichero | Descripción | Tamaño | Formato | |
|---|---|---|---|---|
| accesoRestringido.pdf | 15,38 kB | Adobe PDF |  Visualizar/Abrir |
CORE Recommender
SCOPUSTM
Citations
4
checked on 12-abr-2024
WEB OF SCIENCETM
Citations
4
checked on 28-feb-2024
Page view(s)
283
checked on 23-abr-2024
Download(s)
170
checked on 23-abr-2024
Google ScholarTM
Check
Altmetric
Altmetric
NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.