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  • Title: Deconstructing PTI-1: PTI-1 is a truncated, but not mutated, form of translation elongatin factor 1A1, eEF1A1.
    Author: Mansilla F, Hansen LL, Jakobsen H, Kjeldgaard NO, Clark BF, Knudsen CR.
    Journal: Biochim Biophys Acta; 2005 Feb 14; 1727(2):116-24. PubMed ID: 15716006.
    Abstract:
    The prostate tumor-inducing gene 1 (PTI-1) transcript is detected in various human carcinoma cells. PTI-1 is reported to consist of a 5' untranslated region (5' UTR) homologous to mycoplasma 23S rRNA and a coding region corresponding to a truncated and mutated form of the translation elongation factor 1A, eEF1A. We have found that the PTI-1 transcript may encode a truncated, but not mutated, form of the human isoform eEF1A1. Additionally, the 5' UTR sequence of PTI-1 from genomic DNA of different cell lines and blood samples varies from the original sequence. This 5' -UTR region of PTI-1 presents a fusion of E. coli and Mycoplasma hyorhinis 23S rRNA. We have overexpressed the potential PTI-1 protein in E. coli and various human cell lines. The resulting protein could be detected by western blotting using anti-eEF1A antibodies. However, we were unable to detect the PTI-1 protein in LNCaP cell extracts. The potential roles of the PTI-1 protein in carcinogenesis and the origin of the PTI-1 gene in the human genome are discussed.
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