Biomaterial Database

A tobacco mosaic virus-induced tobacco protein is homologous to the sweet-tasting protein thaumatin. 1986

B J Cornelissen, and R A Hooft van Huijsduijnen, and J F Bol

Infection of tobacco plants with tobacco mosaic virus (TMV) results in an increase in the activities of several enzymes and induces the de novo synthesis of about 10 proteins that are protease-resistant and soluble at pH 3. These proteins accumulate in the intracellular leaf space. The appearance of pathogenesis-related (PR) proteins is closely associated with the phenomenon of 'systemic acquired resistance' and it has been suggested that such proteins have an antiviral function. Previously, we cloned complementary DNAs to the messenger RNAs for the three smallest PR proteins, PR-1a, -1b and -1c, and these clones were used to show that there is an increase of more than 100-fold in the concentration of PR-1 mRNAs following TMV infection of tobacco. Here, we describe the cDNA cloning of another mRNA whose synthesis is induced by TMV infection. Sequencing of the cDNA showed that the encoded protein is highly homologous to thaumatin, the intensely sweet-tasting protein from the fruits of the monocot Thaumatococcus daniellii Benth, a West African rainforest shrub. The conservation of a gene encoding a thaumatin-like protein in tobacco suggests that the encoded protein may have a more general function than that of being sweet-tasting.

UI	MeSH Term	Description	Entries
D010940	Plant Proteins	Proteins found in plants (flowers, herbs, shrubs, trees, etc.). The concept does not include proteins found in vegetables for which PLANT PROTEINS, DIETARY is available.	Plant Protein,Protein, Plant,Proteins, Plant
D002472	Cell Transformation, Viral	An inheritable change in cells manifested by changes in cell division and growth and alterations in cell surface properties. It is induced by infection with a transforming virus.	Transformation, Viral Cell,Viral Cell Transformation,Cell Transformations, Viral,Transformations, Viral Cell,Viral Cell Transformations
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000595	Amino Acid Sequence	The order of amino acids as they occur in a polypeptide chain. This is referred to as the primary structure of proteins. It is of fundamental importance in determining PROTEIN CONFORMATION.	Protein Structure, Primary,Amino Acid Sequences,Sequence, Amino Acid,Sequences, Amino Acid,Primary Protein Structure,Primary Protein Structures,Protein Structures, Primary,Structure, Primary Protein,Structures, Primary Protein
D001483	Base Sequence	The sequence of PURINES and PYRIMIDINES in nucleic acids and polynucleotides. It is also called nucleotide sequence.	DNA Sequence,Nucleotide Sequence,RNA Sequence,DNA Sequences,Base Sequences,Nucleotide Sequences,RNA Sequences,Sequence, Base,Sequence, DNA,Sequence, Nucleotide,Sequence, RNA,Sequences, Base,Sequences, DNA,Sequences, Nucleotide,Sequences, RNA
D012689	Sequence Homology, Nucleic Acid	The sequential correspondence of nucleotides in one nucleic acid molecule with those of another nucleic acid molecule. Sequence homology is an indication of the genetic relatedness of different organisms and gene function.	Base Sequence Homology,Homologous Sequences, Nucleic Acid,Homologs, Nucleic Acid Sequence,Homology, Base Sequence,Homology, Nucleic Acid Sequence,Nucleic Acid Sequence Homologs,Nucleic Acid Sequence Homology,Sequence Homology, Base,Base Sequence Homologies,Homologies, Base Sequence,Sequence Homologies, Base
D013549	Sweetening Agents	Substances that sweeten food, beverages, medications, etc., such as sugar, saccharine or other low-calorie synthetic products. (From Random House Unabridged Dictionary, 2d ed)	Artificial Sweeteners,Sugar Substitutes,Sweeteners,Agent, Sweetening,Agents, Sweetening,Artificial Sweetener,Substitute, Sugar,Substitutes, Sugar,Sugar Substitute,Sweetener,Sweetener, Artificial,Sweeteners, Artificial,Sweetening Agent
D013649	Taste	The ability to detect chemicals through gustatory receptors in the mouth, including those on the TONGUE; the PALATE; the PHARYNX; and the EPIGLOTTIS.	Gustation,Taste Sense,Gustations,Sense, Taste,Senses, Taste,Taste Senses,Tastes
D014027	Tobacco Mosaic Virus	The type species of TOBAMOVIRUS which causes mosaic disease of NICOTIANA. Transmission occurs by mechanical inoculation.	Mosaic Virus, Tobacco,Mosaic Viruses, Tobacco,Tobacco Mosaic Viruses,Virus, Tobacco Mosaic,Viruses, Tobacco Mosaic
D014764	Viral Proteins	Proteins found in any species of virus.	Gene Products, Viral,Viral Gene Products,Viral Gene Proteins,Viral Protein,Protein, Viral,Proteins, Viral