Powell BS, Rogowsky PM, Kado CI. virG of Agrobacterium tumefaciens plasmid pTiC58 encodes a DNA-binding protein.
Mol Microbiol 1989;
3:411-9. [PMID:
2664419 DOI:
10.1111/j.1365-2958.1989.tb00186.x]
[Citation(s) in RCA: 26] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Virulence genes of the Agrobacterium tumefaciens Ti plasmid are positively regulated by the products of virA and virG. To study the DNA-binding properties of the VirG protein, a translational fusion between virG and the trpE gene of Escherichia coli was constructed, and antiserum was raised against the encoded fusion protein. Using this antiserum, a protein of Mr congruent to 29,000, a size similar to that calculated from the virG nucleotide sequence, was detected in an E. coli strain harbouring a virG expression vector. Both the virG protein and the fusion protein were found, by filter-binding and gel retardation analyses, to bind DNA nonspecifically. These data support an existing model for the two-component regulatory systems of bacteria.
Collapse