title: Interaction between F plasmid partition proteins SopA and SopB.
abstract: Two different yeast two hybrid systems were used to examine interaction between the partition proteins SopA and SopB of F plasmid as well as their self association. In one system, the yeast Gal4 protein DNA binding domain (Gal4-BD) is fused to the N-terminus of the bait protein, and the Gal4 activation domain (Gal4-AD) is fused to the N-terminus of the target protein (1). In the other system, the target hybrid remains unchanged but E. coli LexA protein (LexA) is fused to the C-terminus of the bait protein (2). It is found that C-terminus part of SopB is involved in interaction with itself, as an N-terminal truncation of SopB, SopB-(120-323) remains capable of self association. For interaction between SopA, deletion of the N-terminal part weakens but does not abolish the interaction. Interaction between SopB and SopA protein was also detected, but only by the use of the second system. Full length SopB [SopB-(1-323)] or SopB-(1-180) lacking the C-terminal region beyond amino acid 180 can interact with full-length SopA-(1-383) protein.
authors.affiliation: Department of Molecular and Cellular Biology, Harvard University, 7 Divinity Avenue, Cambridge, Massachusetts 02138, USA. skkim@jcwang.harvard.edu
authors.forename: S K
authors.initials: SK
authors.lastname: Kim
authors.forename: J
authors.initials: J
authors.lastname: Shim
mesh_terms: D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism*; D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism; D029968:Escherichia coli Proteins; D005798:Genes, Bacterial; D017930:Genes, Reporter; D006824:Hybridization, Genetic; D007763:Lac Operon; D010446:Peptide Fragments / Q000235:genetics / Q000378:metabolism; D010957:Plasmids / Q000235:genetics* / Q000378:metabolism*; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D012441:Saccharomyces cerevisiae / Q000235:genetics / Q000254:growth & development / Q000378:metabolism; D012697:Serine Endopeptidases / Q000235:genetics / Q000378:metabolism; D000099160:LexA Repressor Protein
chemical_list: D001426:Bacterial Proteins; D029968:Escherichia coli Proteins; D010446:Peptide Fragments; D011993:Recombinant Fusion Proteins; D012697:Serine Endopeptidases; D000099160:LexA Repressor Protein; C060972:SopB protein, Bacteria; C489223:SopB protein, E coli; C060971:SopA protein, Bacteria