English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/137302
Share/Impact:
Statistics
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:
Title

Metal-induced stabilization and activation of plasmid replication initiator RepuB

AuthorsRuiz-Masó, José A. ; Bordanaba-Ruiseco, Lorena; Sanz, Marta; Menéndez, Margarita ; Solar, Gloria del
KeywordsHUH endonucleases
Plasmid-encoded Repproteins
Metal-dependent catalyticactivity,
RepB thermostability
Mn2+ affinity
Issue Date21-Sep-2016
PublisherFrontiers Media
CitationFrontiers in Molecular Biosciences 3:56 (2016)
AbstractInitiation of plasmid rolling circle replication(RCR)is catalyzed by a plasmid-encoded Repprotein that performs aTyr-andmetal-dependentsite-specific cleavage of one DNA strand within the double-strand origin(dso)of replication.The crystal structure of RepB,the initiator protein of the streptococcal plasmid pMV158,constitutes the first example of a Repprotein structure from RCR plasmids.It forms a toroidal homohexamericring where each RepBprotomer consists of two domains:theC-terminal domain involved in oligomerization and the N-terminal domain containing the DNA-binding and endonuclease activities.Binding of Mn2+ to the active site is essential for the catalytic activity of RepB.In this work,we have studied the effects of metal binding on the structure and thermostability of full-length hexameric RepB and each of its separate domains by using different biophysical approaches.The analysis of the temperature-induced changes in RepB shows that the first thermal transition,which occurs at a range of temperatures physiologically relevant for the pMV158 pneumococcal host,represents an irreversible conformational change that affects the secondary and tertiary structure of the protein,which becomes prone to self-associate.This transition,which is also shown to result in loss of DNA binding capacity and catalytic activity of RepB,is confined to its N-terminal domain.Mn2+ protects the protein from undergoing this detrimental conformational hange and the ob served protection correlates well with the high-affinity binding of the cation to the active site,as substituting one of the metal-ligands at this site impairs both the protein affinity for Mn2+ and the Mn2+-driven thermostabilization effect.The level of catalytic activity of the protein,especially in the caseof full-length RepB,cannot be explained based only on the high-affinity binding of Mn2+ at the active site and suggests the existence of additional,lower-affinity metalbinding site(s),missing in these parate catalytic domain,that must also be saturated for maximal activity.The molecular bases of the thermostabilizing effect of Mn2+ on the N-terminal domain of the protein as well as the potential location of additional metalbinding sitesin the entire RepB are discussed.
Description15 p.-8 fig.
Publisher version (URL)http://dx.doi.org/10.3389/fmolb.2016.00056
URIhttp://hdl.handle.net/10261/137302
DOI10.3389/fmolb.2016.00056
E-ISSN2296-889X
Appears in Collections:(IQFR) Artículos
(CIB) Artículos
Files in This Item:
File Description SizeFormat 
fmolb-2016.pdfArtículo principal3,68 MBAdobe PDFThumbnail
View/Open
Show full item record
Review this work
 

Related articles:


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.