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[Prokaryotic expression and purification of human TLE1 N-terminal Q domain fragment and production of its polyclonal antibody].

ABSTRACT: TLE1 is an important protein in regulating Wnt, Notch and EGFR signaling pathways. The TLE1 N-terminal Q domain regulates the pathways by mediating its oligomerization and interaction with LEF1. The aim of this study is to construct the human TLE1 N-terminal Q domain fragment in prokaryotic expression system, express and purify protein TLE1 N-terminal Q domain and prepare its polyclonal antibody.The sequence of TLE1 N-terminal Q domain obtained by PCR from human lung adenocarcinoma cDNA, was cloned into the prokaryotic expression vector pGEX-4T-1 containing Glutathione S-transferase (GST). Vector pGEX-4T1-TLE1-Q was transformed into E.coli BL21 condon plus. The GST-TLE1-Q(1-136) fusion protein was induced by IPTG, digested by Thrombin, purified with glutathione-sepharose beads and FPLC, identified by SDS-PAGE. Then rabbits were immunized with the purified protein TLE1-Q(1-136) for obtaining the antiserum. The titers and specificity of antibodies were measured by ELISA and Western blot.The PCR identification and the sequencing of recombinant plasmid demonstrated that vector pGEX-4T1-TLE1-Q was successfully constructed. The SDS-PAGE shows target protein (14,000 Da) is the interest protein TLE1-Q(1-136). The TLE1 N-terminal Q domain fragment TLE1-Q(1-136) and its polyclonal antibody have been acquired, with an antibody titer of 1:20,000.Expression vector pGEX-4T1-TLE1-Q is correctly constructed. The TLE1 N-terminal Q domain fragment TLE1-Q(1-136) and its polyclonal antibody have been acquired. These work established the foundation for further biological study between TLE1 and lung cancers.

SUBMITTER: Wang S

PROVIDER: S-EPMC6000491 | biostudies-literature | 2010 Nov

REPOSITORIES: biostudies-literature

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[Prokaryotic expression and purification of human TLE1 N-terminal Q domain fragment and production of its polyclonal antibody].

Wang Su S Xu Zhifei Z Tang Hua H Wei Lingyun L Zhao Xuewei X

Zhongguo fei ai za zhi = Chinese journal of lung cancer 20101101 11

<h4>Background</h4>TLE1 is an important protein in regulating Wnt, Notch and EGFR signaling pathways. The TLE1 N-terminal Q domain regulates the pathways by mediating its oligomerization and interaction with LEF1. The aim of this study is to construct the human TLE1 N-terminal Q domain fragment in prokaryotic expression system, express and purify protein TLE1 N-terminal Q domain and prepare its polyclonal antibody.<h4>Methods</h4>The sequence of TLE1 N-terminal Q domain obtained by PCR from huma ...[more]

PMID: 21081038

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Project description:BACKGROUND:Nontypeable Haemophilus influenzae (NTHi) is a common cause of respiratory tract disease and initiates infection by colonization in nasopharynx. The Haemophilus influenzae (H. influenzae) Hap adhesin is an auto transporter protein that promotes initial interaction with human epithelial cells. Hap protein contains a 110 kDa internal passenger domain called "HapS" and a 45 kDa C-terminal translocator domain called "Hap?". Hap adhesive activity has been recently reported to be connected to its Cell Binding Domain (CBD) which resides within the 311 C-terminal residues of the internal passenger domain of the protein. Furthermore, immunization with this CBD protein has been shown to prevent bacterial nasopharynx colonization in animal models. METHODS:To provide enough amounts of pure HapS protein for vaccine studies, we sought to develop a highly optimized system to overexpress and purify the protein in large quantities. To this end, pET24a-cbd plasmid harboring cbd sequence from NTHi ATCC49766 was constructed and its expression was optimized by testing various expression parameters such as growth media, induction temperature, IPTG inducer concentration, induction stage and duration. SDS-PAGE and Western-blotting were used for protein analysis and confirmation and eventually the expressed protein was easily purified via immobilized metal affinity chromatography (IMAC) using Ni-NTA columns. RESULTS:The highest expression level of target protein was achieved when CBD expressing E. coli BL21 (DE3) cells were grown at 37°C in 2xTY medium with 1.0 mM IPTG at mid-log phase (OD600 nm equal to 0.6) for 5 hrs. Amino acid sequence alignment of expressed CBD protein with 3 previously published CBD amino acid sequences were more than %97 identical and antigenicity plot analysis further revealed 9 antigenic domains which appeared to be well conserved among different analyzed CBD sequences. CONCLUSION:Due to the presence of high similarity among CBD from NTHi ATCC49766 and other NTHi strains, CBD protein expressed here sounds to be theoretically ideal as a universal candidate for being used in vaccine studies against NTHi strains of various geographical areas. Further investigations to corroborate the potency of this protein as a vaccine candidate are under process.

Dataset Information

[Prokaryotic expression and purification of human TLE1 N-terminal Q domain fragment and production of its polyclonal antibody].

Publications

[Prokaryotic expression and purification of human TLE1 N-terminal Q domain fragment and production of its polyclonal antibody].

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