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- W2399330371 abstract "Agrobacteria have Ti plasmid DNA delivering systems for the transfer to recipient cells by the conjugation mechanism. This transfer is absolutely dependent on induction tra genes. It is not clear which tra-dependent surface (extracellular) proteins (structures) are involved in the transport mechanism and whether these proteins also play a role in the contact formation. SDS-PAGE electrophoresis of proteins released from the cell showed disappearance of 63 and 67 kD proteins in R1(delta traR) strain, which were found in the growth medium and triton extract from the outer membrane of Ti plasmid-harboring A. tumefaciens R10 strains. The traR defective mutant did not express these proteins and had a higher hemagglutination and flocculation capacity than the wild strain. On the other hand, the wild strain showed D-galactose and N-acetyl-galactosamine specific hemagglutination which was not shown by traR mutant. Motility and chemotactic behavior of traR mutant in semisolid medium were defective. As a rule, one (or rarely two) thread-like connections in vir(-) and tra(+) conditions were observed on the agrobacterial cell surface. SDS pretreatment of agrobacterial cells had a significant effect on the expression of tra-dependent surface structures." @default.
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- W2399330371 date "2001-01-01" @default.
- W2399330371 modified "2023-09-23" @default.
- W2399330371 title "[Formation of TRA-dependent surface structures in Agrobacterium tumefaciens and their absence in R1 (deltatraR) mutant]." @default.
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