Expression and activity of a Kip-related protein, Zeama;KRP1, during maize germination
| Autor: | Elpidio García, Jorge M. Vázquez-Ramos, Natividad de Jesús Juárez, Alfredo Mancilla |
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| Rok vydání: | 2008 |
| Předmět: | |
| Zdroj: | Seed Science Research. 18:67-75 |
| ISSN: | 1475-2735 0960-2585 |
| Popis: | Plant KRP proteins are cyclin/cyclin-dependent kinase subunit (Cdk) inhibitors that share a limited homology with mammalian p27Kip1proteins. Several KRPs have been reported in maize (Zea maysL.), of which Zeama;KRP1 was studied during maize germination. Expression of theZeama;KRP1gene did not vary during the 24 h germination period. A homologous antibody raised against the 13 kDa carboxy end of the Zeama;KRP1 polypeptide, a sequence containing the cyclin/Cdk inhibitory domain, indicated the existence of a 22 kDa protein in maize embryonic axes, the amount of which also remained unchanged during germination. Neither abscisic acid nor cytokinins modified the amount of protein. The purified Zeama;KRP1 polypeptide inhibited the kinase activity associated with Zeama;PCNA and Zeama;CycD2;1, and also the kinase activity in p13Suc1-pulled-down complexes. However, there were differences in the inhibition pattern during germination. Whereas kinase activity in proliferating cell nuclear antigen (PCNA) or CycD2;1 immunoprecipitates was strongly inhibited mainly during early germination, that in p13Suc1-pulled-down complexes was mainly inhibited at late times, suggesting that each protein complex is composed of different cyclins and/or Cdks. |
| Databáze: | OpenAIRE |
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