Molecular insights into plant cell proliferation disturbance by Agrobacterium protein 6b.

Abstract:

:The Agrobacterium Ti plasmid (T-DNA) 6b proteins interact with many different host proteins implicated in plant cell proliferation. Here, we show that Arabidopsis plants overexpressing 6b display microRNA (miRNA) deficiency by directly targeting SERRATE and AGO1 via a specific loop fragment (residues 40-55). In addition, we report the crystal structures of Agrobacterium tumefaciens AK6b at 2.1 Å, Agrobacterium vitis AB6b at 1.65 Å, and Arabidopsis ADP ribosylation factor (ARF) at 1.8 Å. The 6b structure adopts an ADP-ribosylating toxin fold closely related to cholera toxin. In vitro ADP ribosylation analysis demonstrates that 6b represents a new toxin family, with Tyr 66, Thr 93, and Tyr 153 as the ADP ribosylation catalytic residues in the presence of Arabidopsis ARF and GTP. Our work provides molecular insights, suggesting that 6b regulates plant cell growth by the disturbance of the miRNA pathway through its ADP ribosylation activity.

journal_name

Genes Dev

journal_title

Genes & development

authors

Wang M,Soyano T,Machida S,Yang JY,Jung C,Chua NH,Yuan YA

doi

10.1101/gad.1985511

subject

Has Abstract

pub_date

2011-01-01 00:00:00

pages

64-76

issue

1

eissn

0890-9369

issn

1549-5477

pii

gad.1985511

journal_volume

25

pub_type

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