Octopine- and Nopaline-Inducible Proteins in Agrobacterium tumefaciens Are Also Induced by Arginine |
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Authors: | K Palanichelvam K Veluthambi |
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Institution: | (1) Department of Plant Biotechnology, School of Biotechnology, Madurai Kamaraj University, Madurai-625 021, India , IN |
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Abstract: | Octopine induced the synthesis of 83, 76, 62, 58, 44, 42, 31, and 22 kDa proteins in Agrobacterium tumefaciens strains harboring the tumor-inducing (Ti) plasmids pTiA6 and pTiAch5. Nopaline induced the synthesis of 83, 76, 62, 58, 56,
44, 42, 31, and 22 kDa proteins in A. tumefaciens strains harboring the Ti plasmids pTiC58 and pTiT37. The molecular masses of proteins induced by octopine and nopaline were
very similar. In accordance with the ‘opine concept’, octopine and nopaline were found to induce protein synthesis only in
strains harboring the respective Ti plasmids. Arginine, a common catabolic product of octopine and nopaline, induced the synthesis
of most of the proteins induced by the two opines. Our results show that only the initial step(s) of octopine and nopaline
catabolism are induced by specific opines in the respective strains. The subsequent steps are likely to be regulated by arginine
in both strains.
Received: 5 January 1996 / Accepted: 21 February 1996 |
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