Arabidopsis CBF5 interacts with the H/ACA snoRNP assembly factor NAF1.

Abstract:

:The conserved protein CBF5, initially regarded as a centromere binding protein in yeast and higher plants, was later found within nucleoli and in Cajal bodies of yeast and metazoa. There, it is assumed to be involved in posttranscriptional pseudouridinylation of various RNA species that might be important for RNA processing. We found EYFP-labeled CBF5 of A. thaliana to be located within nucleoli and Cajal bodies, but neither at centromeres nor somewhere else on chromosomes. Arabidopsis mutants carrying a homozygous T-DNA insertion at the CBF5 locus were lethal. Yeast two-hybrid and mRNA expression analyses demonstrated that AtCBF5 is co-expressed and interacts with a previously uncharacterized protein containing a conserved NAF1 domain, presumably involved in H/ACA box snoRNP biogenesis. The homologous yeast protein has been shown to contribute to RNA pseudouridinylation. Thus, AtCBF5 might have an essential function in RNA processing rather than being a kinetochore protein.

journal_name

Plant Mol Biol

journal_title

Plant molecular biology

authors

Lermontova I,Schubert V,Börnke F,Macas J,Schubert I

doi

10.1007/s11103-007-9226-z

subject

Has Abstract

pub_date

2007-11-01 00:00:00

pages

615-26

issue

5

eissn

0167-4412

issn

1573-5028

journal_volume

65

pub_type

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