Volokhina I, Chumakov M. Study of the VirE2-ssT-DNA complex formation by scanning probe microscopy and gel electrophoresis- T-complex visualization.
MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2007;
13:51-4. [PMID:
17234037 DOI:
10.1017/s1431927607070158]
[Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2006] [Accepted: 10/08/2006] [Indexed: 05/13/2023]
Abstract
The recombinant virulence protein VirE2, capable of forming a complex with single-stranded T-DNA during transfer into plant cells, was isolated, purified, and used for interactions with ssT-DNA. The in vitro interaction of VirE2 and ss-binding protein from Escherichia coli with single-stranded DNA (phage lambda) was determined by agarose gel electrophoresis by the formation of high-molecular-weight complexes after preliminary coincubation of purified protein preparations with ssDNA. We show that VirE2 binds to single-stranded DNA and protects it against nuclease S1 degradation much better than does E. coli SSB protein. We for first time observed the VirE2-ssT-DNA complex by using atomic force microscopy. The complex observed by atomic force microscopy after ssT-DNA and VirE2 protein mixing has a length of about 800 nm and a 5-8 nm width in sites with attached VirE2 protein.
Collapse