The double par locus of virulence factor pB171: DNA segregation is correlated with oscillation of ParA
Research output: Contribution to journal › Journal article › Research › peer-review
Standard
The double par locus of virulence factor pB171 : DNA segregation is correlated with oscillation of ParA. / Ebersbach, Gitte; Gerdes, Kenn.
In: Proceedings of the National Academy of Sciences of the United States of America, Vol. 98, No. 26, 2001, p. 15078-15083.Research output: Contribution to journal › Journal article › Research › peer-review
Harvard
APA
Vancouver
Author
Bibtex
}
RIS
TY - JOUR
T1 - The double par locus of virulence factor pB171
T2 - DNA segregation is correlated with oscillation of ParA
AU - Ebersbach, Gitte
AU - Gerdes, Kenn
PY - 2001
Y1 - 2001
N2 - Prokaryotic plasmids and chromosomes encode partitioning (par) loci that segregate DNA to daughter cells before cell division. Recent database analyses showed that almost all known par loci encode an ATPase and a DNA-binding protein, and one or more cis-acting regions where the proteins act. All par-encoded ATPases belong to one of two protein superfamilies, Walker-type and actin-like ATPases. This property was recently used to divide par loci into Types I and II loci. We show here that the Escherichia coli virulence factor pB171 encodes a double par locus that consists of one Type I and one Type II locus. Separately, each locus stabilized a test-plasmid efficiently. Together, the two loci mediated even more efficient plasmid stabilization. The par loci have a unique genetic organization in that they share a common central region at which the two different DNA-binding proteins probably act. Interestingly, a fusion protein consisting of the Walker-type ParA ATPase and Gfp was functional and oscillated in nucleoid regions on a time scale of minutes. ParA-green fluorescent protein (Gfp) oscillation depended on both ParB and parC but was independent of minCDE. Point mutations in the Walker A box motif simultaneously abolished plasmid stabilization and ParA-Gfp oscillation. These observations raise the possibility that ParA oscillation is prerequisite for active plasmid segregation.
AB - Prokaryotic plasmids and chromosomes encode partitioning (par) loci that segregate DNA to daughter cells before cell division. Recent database analyses showed that almost all known par loci encode an ATPase and a DNA-binding protein, and one or more cis-acting regions where the proteins act. All par-encoded ATPases belong to one of two protein superfamilies, Walker-type and actin-like ATPases. This property was recently used to divide par loci into Types I and II loci. We show here that the Escherichia coli virulence factor pB171 encodes a double par locus that consists of one Type I and one Type II locus. Separately, each locus stabilized a test-plasmid efficiently. Together, the two loci mediated even more efficient plasmid stabilization. The par loci have a unique genetic organization in that they share a common central region at which the two different DNA-binding proteins probably act. Interestingly, a fusion protein consisting of the Walker-type ParA ATPase and Gfp was functional and oscillated in nucleoid regions on a time scale of minutes. ParA-green fluorescent protein (Gfp) oscillation depended on both ParB and parC but was independent of minCDE. Point mutations in the Walker A box motif simultaneously abolished plasmid stabilization and ParA-Gfp oscillation. These observations raise the possibility that ParA oscillation is prerequisite for active plasmid segregation.
KW - Bacterial Proteins
KW - Base Sequence
KW - DNA, Bacterial
KW - Green Fluorescent Proteins
KW - Luminescent Proteins
KW - Molecular Sequence Data
KW - Mutation
KW - Plasmids
KW - Recombinant Fusion Proteins
KW - Virulence
U2 - 10.1073/pnas.261569598
DO - 10.1073/pnas.261569598
M3 - Journal article
C2 - 11752455
VL - 98
SP - 15078
EP - 15083
JO - Proceedings of the National Academy of Sciences of the United States of America
JF - Proceedings of the National Academy of Sciences of the United States of America
SN - 0027-8424
IS - 26
ER -
ID: 35162029