NDLI: The Agrobacterium rhizogenes GALLS Gene Encodes Two Secreted Proteins Required for Genetic Transformation of Plants▿

Content Provider	PubMed Central
Author	Hodges, Larry D. Lee, Lan-ying Mcnett, Henry Gelvin, Stanton B. Ream, Walt
Abstract	Agrobacterium tumefaciens and Agrobacterium rhizogenes are related pathogens that cause crown gall and hairy root diseases, which result from integration and expression of bacterial genes in the plant genome. Single-stranded DNA (T strands) and virulence proteins are translocated into plant cells by a type IV secretion system. VirD2 nicks a specific DNA sequence, attaches to the 5′ end, and pilots the DNA into plant cells. A. tumefaciens translocates single-stranded DNA-binding protein VirE2 into plant cells where it likely binds T strands and may aid in targeting them into the nucleus. Although some A. rhizogenes strains lack VirE2, they transfer T strands efficiently due to the GALLS gene, which complements an A. tumefaciens virE2 mutant for tumor formation. Unlike VirE2, full-length GALLS (GALLS-FL) contains ATP-binding and helicase motifs similar to those in TraA, a strand transferase involved in conjugation. GALLS-FL and VirE2 contain nuclear localization signals (NLS) and secretion signals. Mutations in any of these domains abolish the ability of the GALLS gene to substitute for virE2. Here, we show that the GALLS gene encodes two proteins from one open reading frame: GALLS-FL and a protein comprised of the C-terminal domain, which initiates at an internal in-frame start codon. On some hosts, both GALLS proteins were required to substitute for VirE2. GALLS-FL tagged with yellow fluorescent protein localized to the nucleus of tobacco cells in an NLS-dependent manner. In plant cells, the GALLS proteins interacted with themselves, VirD2, and each other. VirD2 interacted with GALLS-FL and localized inside the nucleus, where its predicted helicase activity may pull T strands into the nucleus.
Related Links	http://dx.doi.org/10.1128/jb.01018-08
Ending Page	364
Page Count	10
Starting Page	355
File Format	PDF
ISSN	00219193
e-ISSN	10985530
Journal	Journal of Bacteriology
Issue Number	1
Volume Number	191
Language	English
Publisher	American Society for Microbiology (ASM)
Publisher Date	2009-01-01
Access Restriction	Open
Rights Holder	American Society for Microbiology (ASM)
Subject Keyword	Molecular Biology Microbiology Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Molecular Biology Microbiology

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