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Alfalfa Mob1-like proteins are involved in cell proliferation and are localized in the cell division plane during cytokinesis.

Abstract：

:Mps-one-binder (Mob) proteins play a crucial role in yeast cytokinesis. After cloning two Mob1-like genes, MsMob1-A and MsMob1-B from alfalfa (Medicago sativa L.) we show that, although they are constitutively expressed in roots, stems, leaves, flowers and pods, their transcripts and proteins are mostly produced in actively proliferating tissues. A polyclonal antibody specifically raised against MsMob1 proteins was used for immunolocalization studies in synchronized root tip cells. The subcellular localization of MsMob1-like proteins is demonstrated to be cell cycle-regulated. Cytoplasmic localization is faint and diffused during G1 and S. It becomes concentrated in punctuate and fibrillar structures in G2 as well as M phase. At the stage of cytokinesis, the protein is found at the emerging cell plate marking the progressive formation of the septum. Mob1 proteins partially co-localize with microtubules structures functionally related to the spindles and important for cytokinesis in eukaryotic cells. The MsMob1 expression cannot rescue the lethality of the yeast mob1 mutant, suggesting that interaction of Mob1 proteins with their effectors may be species-specific. Localization of Mob1 proteins in the inner layer of the root cap indicates an additional function for this class of proteins in plants, which is likely related to the onset of programmed cell death.

journal_name

Exp Cell Res

journal_title

Experimental cell research

authors

Citterio S,Piatti S,Albertini E,Aina R,Varotto S,Barcaccia G

doi

10.1016/j.yexcr.2005.12.032

keywords:

subject

Has Abstract

pub_date

2006-04-15 00:00:00

pages

1050-64

issue

7

eissn

0014-4827

issn

1090-2422

pii

S0014-4827(05)00612-9

journal_volume

312

pub_type

杂志文章

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