title: MipZ, a spatial regulator coordinating chromosome segregation with cell division in Caulobacter.
abstract: Correct positioning of the division plane is a prerequisite for the generation of daughter cells with a normal chromosome complement. Here, we present a mechanism that coordinates assembly and placement of the FtsZ cytokinetic ring with bipolar localization of the newly duplicated chromosomal origins in Caulobacter. After replication of the polarly located origin region, one copy moves rapidly to the opposite end of the cell in an MreB-dependent manner. A previously uncharacterized essential protein, MipZ, forms a complex with the partitioning protein ParB near the origin of replication and localizes with the duplicated origin regions to the cell poles. MipZ directly interferes with FtsZ polymerization, thereby restricting FtsZ ring formation to midcell, the region of lowest MipZ concentration. The cellular localization of MipZ thus serves the dual function of positioning the FtsZ ring and delaying formation of the cell division apparatus until chromosome segregation has initiated.
authors.affiliation: Department of Developmental Biology, Stanford University School of Medicine, Beckman Center B300, 279 Campus Drive, Stanford, CA 94305, USA.
authors.forename: Martin
authors.initials: M
authors.lastname: Thanbichler
authors.forename: Lucy
authors.initials: L
authors.lastname: Shapiro
mesh_terms: D000251:Adenosine Triphosphatases / Q000235:genetics* / Q000302:isolation & purification / Q000378:metabolism; D000255:Adenosine Triphosphate / Q000378:metabolism; D001426:Bacterial Proteins / Q000235:genetics* / Q000302:isolation & purification / Q000378:metabolism*; D016934:Caulobacter / Q000235:genetics* / Q000378:metabolism / Q000648:ultrastructure; D002451:Cell Compartmentation / Q000235:genetics; D002455:Cell Division / Q000235:genetics*; D016764:Cell Polarity / Q000235:genetics; D020090:Chromosome Segregation / Q000235:genetics*; D002875:Chromosomes / Q000235:genetics / Q000648:ultrastructure; D048749:Cytokinesis / Q000235:genetics; D003598:Cytoskeletal Proteins / Q000235:genetics / Q000378:metabolism*; D019915:DNA Primase; D004261:DNA Replication / Q000235:genetics; D004269:DNA, Bacterial / Q000235:genetics; D004706:Endodeoxyribonucleases / Q000235:genetics / Q000378:metabolism; D029968:Escherichia coli Proteins / Q000235:genetics / Q000378:metabolism; D005090:Exodeoxyribonucleases / Q000235:genetics / Q000378:metabolism; D046911:Macromolecular Substances / Q000378:metabolism
chemical_list: D001426:Bacterial Proteins; D003598:Cytoskeletal Proteins; D004269:DNA, Bacterial; D029968:Escherichia coli Proteins; C071525:FtsZ protein, Bacteria; D046911:Macromolecular Substances; C078473:MreB protein, E coli; D000255:Adenosine Triphosphate; D019915:DNA Primase; D004706:Endodeoxyribonucleases; D005090:Exodeoxyribonucleases; C121791:dnaG protein, E coli; D000251:Adenosine Triphosphatases