title: Plk1 relieves centriole block to reduplication by promoting daughter centriole maturation.
abstract: Centrosome overduplication promotes mitotic abnormalities, invasion and tumorigenesis. Cells regulate the number of centrosomes by limiting centriole duplication to once per cell cycle. The orthogonal orientation between a mother and a daughter centriole, established at the time of centriole duplication, is thought to block further duplication of the mother centriole. Loss of orthogonal orientation (disengagement) between two centrioles during anaphase is considered a licensing event for the next round of centriole duplication. Disengagement requires the activity of Polo-like kinase 1 (Plk1), but how Plk1 drives this process is not clear. Here we employ correlative live/electron microscopy and demonstrate that Plk1 induces maturation and distancing of the daughter centriole, allowing reduplication of the mother centriole even if the original daughter centriole is still orthogonal to it. We find that mother centrioles can undergo reduplication when original daughter centrioles are only ∼80 nm apart, which is the distance centrioles normally reach during prophase.
authors: Laboratory of Protein Dynamics and Signaling, 1050 Boyles Street, NIH/NCI/CCR, Frederick, Maryland 21702, USA.
authors: Anil
authors: A
authors: Shukla
authors: Laboratory of Protein Dynamics and Signaling, 1050 Boyles Street, NIH/NCI/CCR, Frederick, Maryland 21702, USA.
authors: Dong
authors: D
authors: Kong
authors: Laboratory of Protein Dynamics and Signaling, 1050 Boyles Street, NIH/NCI/CCR, Frederick, Maryland 21702, USA.
authors: Meena
authors: M
authors: Sharma
authors: Optical Microscopy and Analysis Laboratory, Leidos Biomedical Res Inc., Frederick National Laboratory for Cancer Research, Frederick, Maryland 21702, USA.
authors: Valentin
authors: V
authors: Magidson
authors: Laboratory of Protein Dynamics and Signaling, 1050 Boyles Street, NIH/NCI/CCR, Frederick, Maryland 21702, USA.
authors: Jadranka
authors: J
authors: Loncarek
mesh_terms: D059447:Cell Cycle Checkpoints; D018797:Cell Cycle Proteins / Q000235:genetics / Q000378:metabolism*; D049109:Cell Proliferation / Q000502:physiology*; D002502:Centrioles / Q000502:physiology*; D005786:Gene Expression Regulation / Q000502:physiology*; D049452:Green Fluorescent Proteins; D006367:HeLa Cells; D006801:Humans; D017346:Protein Serine-Threonine Kinases / Q000235:genetics / Q000378:metabolism*; D011518:Proto-Oncogene Proteins / Q000235:genetics / Q000378:metabolism*; D034741:RNA, Small Interfering; D000097869:Polo-Like Kinase 1
chemical_list: D018797:Cell Cycle Proteins; D049452:Green Fluorescent Proteins; D017346:Protein Serine-Threonine Kinases; D011518:Proto-Oncogene Proteins; D034741:RNA, Small Interfering; D000097869:Polo-Like Kinase 1