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Publication Abstract from PubMed

Tm-1, the protein product of Tm-1, a semidominant resistance gene of tomato, inhibits tomato mosaic virus (ToMV) replication by binding to ToMV replication proteins. Previous studies suggested the importance of the Tm-1 N-terminal region for its inhibitory activity; however, it has not been determined if the N-terminal region is sufficient for inhibition. Furthermore, the three-dimensional structure of Tm-1 has not been determined. In this study, an N-terminal fragment of Tm-1 (residues 1-431) as a fusion protein containing an upstream maltose-binding protein was expressed in E. coli Rosetta (DE3) cells at 30 degrees C and then purified. The solubility of the fusion protein was greater when the cells were cultured at 30 degrees C than when cultured at lower or higher temperatures. The purified N-terminal Tm-1 fragment from which the maltose-binding protein tag had been removed has inhibitory activity against ToMV RNA replication.

Expression, purification, and functional characterization of an N-terminal fragment of the tomato mosaic virus resistance protein Tm-1.,Kato M, Ishibashi K, Kobayashi C, Ishikawa M, Katoh E Protein Expr Purif. 2013 May;89(1):1-6. doi: 10.1016/j.pep.2013.02.001. Epub 2013, Feb 13. PMID:23415925^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.