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    Expression and purification of a Tuber borchii fruitbody-specific protein, TBF-1, from Escherichia coli: generation of polyclonal antibodies

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    TBF-1 is a fruitbody-specific protein present in the white truffle species Tuber borchii Vittad. A similar protein has been found only in the closely related species Tuber dryophilum (TDF-1), but not in other truffles. The protein from T. borchii was overexpressed as fusion protein in E. coli and was purified to homogeneity by affinity chromatography. Recombinant protein was used for generating polyclonal antibodies. The antiserum strongly reacted with TBF-1, weakly recognized TDF-1, and did not detect correlate band in the other white truffle species. The high level of expression of this protein in the fruitbody and the specificity of the antibody anti-TBF-1 make it possible to set up a diagnostic tool for detecting these species in natural samples and foodstuffs

    Identification, purification and gene cloning of a protein from Tuber dryophilum fruitbody homologous to the TBF-1 protein

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    This paper reports a study aimed at gaining new information on the molecular composition of fruitbodies of Tuber spp. The presence of proteins homologous to TBF-1, which is highly specific for the fruitbody-phase of Tuber borchii, has been investigated in other white truffles. SDS-PAGE analyses revealed that only Tuber dryophilum fruitbodies possess a similar protein. This protein was purified by HPLC and partially sequenced, confirming a high degree of homology with TBF-1. Several PCR analyses of the genomic DNA, were performed to evaluate whether the absence of proteins homologous to TBF-1 in other white truffle species was a result of the absence of the coding genes. T. dryophilum gave an amplification product corresponding to the entire gene (tdf-1), but no products were obtained from the other species. Tdf-1 was sequenced and its organisation studied since it is one of the first genes isolated from a Tuber species. The deduced amino acid sequence was compared to that of TBF-1, to evaluate the presence of conserved regions, in an attempt to gain new information about their role in fruitbody formation
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