The Bacillus subtilis bacteriophage SPP1 G39P delivers and activates the G40P DNA helicase upon interacting with the G38P-bound replication origin.

Détails

ID Serval
serval:BIB_C6FE295B86C2
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
The Bacillus subtilis bacteriophage SPP1 G39P delivers and activates the G40P DNA helicase upon interacting with the G38P-bound replication origin.
Périodique
Journal of Molecular Biology
Auteur(s)
Ayora S., Stasiak A., Alonso J.C.
ISSN
0022-2836[print], 0022-2836[linking]
Statut éditorial
Publié
Date de publication
1999
Volume
288
Numéro
1
Pages
71-85
Langue
anglais
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov't
Publication Status: ppublish
Résumé
Initiation of Bacillus subtilis bacteriophage SPP1 replication requires the phage-encoded genes 38, 39 and 40 products (G38P, G39P and G40P). G39P, which does not bind DNA, interacts with the replisome organiser, G38P, in the absence of ATP and with the ATP-activated hexameric replication fork helicase, G40P. G38P, which specifically interacts with the phage replication origin (oriL) DNA, does not seem to form a stable complex with G40P in solution. G39P when complexed with G40P-ATP inactivates the single-stranded DNA binding, ATPase and unwinding activities of G40P, and such effects are reversed by increasing amounts of G38P. Unwinding of a forked substrate by G40P-ATP is increased about tenfold by the addition of G38P and G39P to the reaction mixture. The specific protein-protein interactions between oriL-bound G38P and the G39P-G40P-ATPgammaS complex are necessary for helicase delivery to the SPP1 replication origin. Formation of G38P-G39P heterodimers releases G40P-ATPgammaS from the unstable oriL-G38P-G39P-G40P-ATPgammaS intermediate. G40P-ATPgammaS binds to the origin region, the uncomplexed G38P fraction remains bound to oriL, and the G38P-G39P heterodimer is lost from the complex. We demonstrate that G39P is a component of an oligomeric nucleoprotein complex which plays an important role in the initiation of SPP1 replication.
Mots-clé
Adenosine Triphosphate/analogs &amp, derivatives, Adenosine Triphosphate/metabolism, Bacillus Phages/genetics, Bacillus Phages/physiology, Carrier Proteins/physiology, DNA Helicases/metabolism, DNA, Single-Stranded/metabolism, DNA, Viral/metabolism, DNA-Binding Proteins/metabolism, Enzyme Activation, Macromolecular Substances, Models, Genetic, Protein Binding, Replication Origin, Viral Nonstructural Proteins/metabolism, Viral Nonstructural Proteins/physiology, Viral Proteins, Virus Replication
Pubmed
Web of science
Création de la notice
24/01/2008 11:36
Dernière modification de la notice
20/08/2019 16:42
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