Structural analysis of Bacillus subtilis SPP1 phage helicase loader protein G39P

Scott Bailey, Svetlana E. Sedelnikova, Pablo Mesa, Sylvia Ayora, Jon P. Waltho, Alison E. Ashcroft, Andrew J. Baron, Juan C. Alonso, John B. Rafferty

Research output: Contribution to journalArticle

Abstract

The Bacillus subtilis SPP1 phage-encoded protein G39P is a loader and inhibitor of the phage G40P replicative helicase involved in the initiation of DNA replication. We have carried out a full x-ray crystallographic and preliminary NMR analysis of G39P and functional studies of the protein, including assays for helicase binding by a number of truncated mutant forms, in an effort to improve our understanding of how it both interacts with the helicase and with the phage replisome organizer, G38P. Our structural analyses reveal that G39P has a completely unexpected bipartite structure comprising a folded N-terminal domain and an essentially unfolded C-terminal domain. Although G39P has been shown to bind its G40P target with a 6:6 stoichiometry, our crystal structure and other biophysical characterization data reveal that the protein probably exists predominantly as a monomer in solution. The G39P protein is proteolytically sensitive, and our binding assays show that the C-terminal domain is essential for helicase interaction and that removal of just the 14 C-terminal residues abolishes interaction with the helicase in vitro. We propose a number of possible scenarios in which the flexibility of the C-terminal domain of G39P and its proteolytic sensitivity may have important roles for the function of G39P in vivo that are consistent with other data on SPP1 phage DNA replication.

Original languageEnglish (US)
Pages (from-to)15304-15312
Number of pages9
JournalJournal of Biological Chemistry
Volume278
Issue number17
DOIs
StatePublished - Apr 25 2003
Externally publishedYes

Fingerprint

Loaders
Bacteriophages
Bacilli
Bacillus subtilis
Structural analysis
DNA Replication
Assays
Proteins
DNA
Stoichiometry
Monomers
Crystal structure
Nuclear magnetic resonance
X-Rays
X rays

ASJC Scopus subject areas

  • Biochemistry

Cite this

Bailey, S., Sedelnikova, S. E., Mesa, P., Ayora, S., Waltho, J. P., Ashcroft, A. E., ... Rafferty, J. B. (2003). Structural analysis of Bacillus subtilis SPP1 phage helicase loader protein G39P. Journal of Biological Chemistry, 278(17), 15304-15312. https://doi.org/10.1074/jbc.M209300200

Structural analysis of Bacillus subtilis SPP1 phage helicase loader protein G39P. / Bailey, Scott; Sedelnikova, Svetlana E.; Mesa, Pablo; Ayora, Sylvia; Waltho, Jon P.; Ashcroft, Alison E.; Baron, Andrew J.; Alonso, Juan C.; Rafferty, John B.

In: Journal of Biological Chemistry, Vol. 278, No. 17, 25.04.2003, p. 15304-15312.

Research output: Contribution to journalArticle

Bailey, S, Sedelnikova, SE, Mesa, P, Ayora, S, Waltho, JP, Ashcroft, AE, Baron, AJ, Alonso, JC & Rafferty, JB 2003, 'Structural analysis of Bacillus subtilis SPP1 phage helicase loader protein G39P', Journal of Biological Chemistry, vol. 278, no. 17, pp. 15304-15312. https://doi.org/10.1074/jbc.M209300200
Bailey, Scott ; Sedelnikova, Svetlana E. ; Mesa, Pablo ; Ayora, Sylvia ; Waltho, Jon P. ; Ashcroft, Alison E. ; Baron, Andrew J. ; Alonso, Juan C. ; Rafferty, John B. / Structural analysis of Bacillus subtilis SPP1 phage helicase loader protein G39P. In: Journal of Biological Chemistry. 2003 ; Vol. 278, No. 17. pp. 15304-15312.
@article{a654428f49e64a6b8db411f4456f07e8,
title = "Structural analysis of Bacillus subtilis SPP1 phage helicase loader protein G39P",
abstract = "The Bacillus subtilis SPP1 phage-encoded protein G39P is a loader and inhibitor of the phage G40P replicative helicase involved in the initiation of DNA replication. We have carried out a full x-ray crystallographic and preliminary NMR analysis of G39P and functional studies of the protein, including assays for helicase binding by a number of truncated mutant forms, in an effort to improve our understanding of how it both interacts with the helicase and with the phage replisome organizer, G38P. Our structural analyses reveal that G39P has a completely unexpected bipartite structure comprising a folded N-terminal domain and an essentially unfolded C-terminal domain. Although G39P has been shown to bind its G40P target with a 6:6 stoichiometry, our crystal structure and other biophysical characterization data reveal that the protein probably exists predominantly as a monomer in solution. The G39P protein is proteolytically sensitive, and our binding assays show that the C-terminal domain is essential for helicase interaction and that removal of just the 14 C-terminal residues abolishes interaction with the helicase in vitro. We propose a number of possible scenarios in which the flexibility of the C-terminal domain of G39P and its proteolytic sensitivity may have important roles for the function of G39P in vivo that are consistent with other data on SPP1 phage DNA replication.",
author = "Scott Bailey and Sedelnikova, {Svetlana E.} and Pablo Mesa and Sylvia Ayora and Waltho, {Jon P.} and Ashcroft, {Alison E.} and Baron, {Andrew J.} and Alonso, {Juan C.} and Rafferty, {John B.}",
year = "2003",
month = "4",
day = "25",
doi = "10.1074/jbc.M209300200",
language = "English (US)",
volume = "278",
pages = "15304--15312",
journal = "Journal of Biological Chemistry",
issn = "0021-9258",
publisher = "American Society for Biochemistry and Molecular Biology Inc.",
number = "17",

}

TY - JOUR

T1 - Structural analysis of Bacillus subtilis SPP1 phage helicase loader protein G39P

AU - Bailey, Scott

AU - Sedelnikova, Svetlana E.

AU - Mesa, Pablo

AU - Ayora, Sylvia

AU - Waltho, Jon P.

AU - Ashcroft, Alison E.

AU - Baron, Andrew J.

AU - Alonso, Juan C.

AU - Rafferty, John B.

PY - 2003/4/25

Y1 - 2003/4/25

N2 - The Bacillus subtilis SPP1 phage-encoded protein G39P is a loader and inhibitor of the phage G40P replicative helicase involved in the initiation of DNA replication. We have carried out a full x-ray crystallographic and preliminary NMR analysis of G39P and functional studies of the protein, including assays for helicase binding by a number of truncated mutant forms, in an effort to improve our understanding of how it both interacts with the helicase and with the phage replisome organizer, G38P. Our structural analyses reveal that G39P has a completely unexpected bipartite structure comprising a folded N-terminal domain and an essentially unfolded C-terminal domain. Although G39P has been shown to bind its G40P target with a 6:6 stoichiometry, our crystal structure and other biophysical characterization data reveal that the protein probably exists predominantly as a monomer in solution. The G39P protein is proteolytically sensitive, and our binding assays show that the C-terminal domain is essential for helicase interaction and that removal of just the 14 C-terminal residues abolishes interaction with the helicase in vitro. We propose a number of possible scenarios in which the flexibility of the C-terminal domain of G39P and its proteolytic sensitivity may have important roles for the function of G39P in vivo that are consistent with other data on SPP1 phage DNA replication.

AB - The Bacillus subtilis SPP1 phage-encoded protein G39P is a loader and inhibitor of the phage G40P replicative helicase involved in the initiation of DNA replication. We have carried out a full x-ray crystallographic and preliminary NMR analysis of G39P and functional studies of the protein, including assays for helicase binding by a number of truncated mutant forms, in an effort to improve our understanding of how it both interacts with the helicase and with the phage replisome organizer, G38P. Our structural analyses reveal that G39P has a completely unexpected bipartite structure comprising a folded N-terminal domain and an essentially unfolded C-terminal domain. Although G39P has been shown to bind its G40P target with a 6:6 stoichiometry, our crystal structure and other biophysical characterization data reveal that the protein probably exists predominantly as a monomer in solution. The G39P protein is proteolytically sensitive, and our binding assays show that the C-terminal domain is essential for helicase interaction and that removal of just the 14 C-terminal residues abolishes interaction with the helicase in vitro. We propose a number of possible scenarios in which the flexibility of the C-terminal domain of G39P and its proteolytic sensitivity may have important roles for the function of G39P in vivo that are consistent with other data on SPP1 phage DNA replication.

UR - http://www.scopus.com/inward/record.url?scp=0038012347&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0038012347&partnerID=8YFLogxK

U2 - 10.1074/jbc.M209300200

DO - 10.1074/jbc.M209300200

M3 - Article

VL - 278

SP - 15304

EP - 15312

JO - Journal of Biological Chemistry

JF - Journal of Biological Chemistry

SN - 0021-9258

IS - 17

ER -