Abstract：
:Although activation of A-type cyclin-dependent kinase (CDKA) is required for plant cell division, little is known about how CDKA is activated before commitment to cell division. Here, we show that auxin is required for the formation of active CDKA-associated complexes, promoting assembly of the complex in tobacco suspension culture Bright Yellow-2 (BY-2) cells. Protein gel blot analysis revealed that CDKA levels increased greatly after stationary-phase BY-2 cells were subcultured into fresh medium to re-enter the cell cycle. However, these increasing levels subsided when cells were subcultured into auxin-deprived medium, and a subtle increase was observed after subculturing into sucrose-deprived medium. Additionally, p13(suc1)-associated kinase activity did not increase significantly after subculturing into either auxin- or sucrose-deprived medium, but increased strongly after subculturing into medium containing both auxin and sucrose. Using gel filtration, we found that p13(suc1)-associated kinase activity against tobacco retinoblastoma-related protein was maximal in fractions corresponding to the molecular mass of the cyclin/CDKA complex. Interestingly, this peak distribution of high molecular-mass fractions of CDKA disappeared after cells were subcultured into auxin-deprived medium. These findings suggest an important role for auxin in the assembly of active CDKA-associated complexes.
journal_name
J Plant Physioljournal_title
Journal of plant physiologyauthors
Harashima H,Kato K,Shinmyo A,Sekine Mdoi
10.1016/j.jplph.2007.01.005subject
Has Abstractpub_date
2007-09-01 00:00:00pages
1103-12issue
9eissn
0176-1617issn
1618-1328pii
S0176-1617(07)00021-1journal_volume
164pub_type
杂志文章abstract：:Chlorophyll-oxidase in barley thylakoids was activated by linolenic acid. The reaction products from endogenous chlorophylls were investigated by thin layer and high performance liquid chromatography. Within 2-10 min a new pigment was formed which migrated identically with authentic 13(2)-hydroxychlorophyll a (1a). Af...
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更新日期：2016-11-01 00:00:00
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更新日期：2013-08-15 00:00:00
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