Publication Date:
1996-10-11
Description:
The spindle assembly checkpoint delays anaphase until all chromosomes are attached to a mitotic spindle. The mad (mitotic arrest-deficient) and bub (budding uninhibited by benzimidazole) mutants of budding yeast lack this checkpoint and fail to arrest the cell cycle when microtubules are depolymerized. A frog homolog of MAD2 (XMAD2) was isolated and found to play an essential role in the spindle assembly checkpoint in frog egg extracts. XMAD2 protein associated with unattached kinetochores in prometaphase and in nocodazole-treated cells and disappeared from kinetochores at metaphase in untreated cells, suggesting that XMAD2 plays a role in the activation of the checkpoint by unattached kinetochores. This study furthers understanding of the mechanism of cell cycle checkpoints in metazoa and provides a marker for studying the role of the spindle assembly checkpoint in the genetic instability of tumors.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chen, R H -- Waters, J C -- Salmon, E D -- Murray, A W -- New York, N.Y. -- Science. 1996 Oct 11;274(5285):242-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physiology, University of California, San Francisco, 94143, USA. Chapel Hill, NC 27599, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8824188" target="_blank"〉PubMed〈/a〉
Keywords:
ATP-Binding Cassette Transporters/analysis/chemistry/genetics/*metabolism
;
Amino Acid Sequence
;
Animals
;
Calcium/pharmacology
;
*Cell Cycle
;
Cells, Cultured
;
HeLa Cells
;
Humans
;
Interphase
;
Kinetochores/*metabolism
;
Lamins
;
Microtubules/metabolism
;
Mitosis
;
Molecular Sequence Data
;
Nuclear Envelope/chemistry
;
Nuclear Proteins/metabolism
;
Ovum
;
P-Glycoprotein/analysis/chemistry/genetics/*metabolism
;
*P-Glycoproteins
;
Protamine Kinase/metabolism
;
Spindle Apparatus/*physiology
;
Xenopus
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
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