title: AtTFC B is involved in control of cell division.
abstract: Tubulin-folding cofactors play important roles in regulating plant development. Arabidopsis tubulin-folding cofactor B (AtTFC B) is an Arabidopsis homolog of mammalian tubulin-folding cofactor B, whose biological function in plant development remains poorly understood. Here we report that the homozygous attfc b (-/-) allele caused embryonic lethality. Embryogenesis was arrested at early embryo stage and the cells contained one or multiple nuclei. Plants carrying a heterozygous attfc b (+/-) allele exhibited enlarged mesophyll cells and leaf epidermal cells with bulged nuclei. Flow cytometry analysis showed increased ploidy in the leaves of the attfc b (+/-) mutant, as well as increased levels of Cdc2A and CycB1;1. In addition, immunofluorescence assay showed increased numbers of spindles and phragmoplasts in the attfc b (+/-) mutant. These results suggest that AtTFC B plays an important role in plant cell division.
authors.affiliation: Peking-Yale Joint Center for Plant Molecular Genetics and Agrobiotechnology, National Laboratory of Protein Engineering and Plant Genetic Engineering, College of Life Science, The National Plant Gene Research Center, Peking University, Beijing 100871, China.
authors.forename: Yunlong
authors.initials: Y
authors.lastname: Du
authors.forename: Meiqiang
authors.initials: M
authors.lastname: Cui
authors.forename: Dan
authors.initials: D
authors.lastname: Qian
authors.forename: Lei
authors.initials: L
authors.lastname: Zhu
authors.forename: Chunhong
authors.initials: C
authors.lastname: Wei
authors.forename: Ming
authors.initials: M
authors.lastname: Yuan
authors.forename: Zhongkai
authors.initials: Z
authors.lastname: Zhang
authors.forename: Yi
authors.initials: Y
authors.lastname: Li
mesh_terms: D017360:Arabidopsis / Q000196:embryology* / Q000235:genetics*; D029681:Arabidopsis Proteins / Q000235:genetics / Q000502:physiology*; D002455:Cell Division / Q000235:genetics*; D005434:Flow Cytometry; D005455:Fluorescent Antibody Technique; D020043:Genes, Essential / Q000235:genetics; D018832:Molecular Chaperones / Q000235:genetics / Q000502:physiology*
chemical_list: D029681:Arabidopsis Proteins; D018832:Molecular Chaperones; C550449:TFC-B protein, Arabidopsis