結(jié)核分枝桿菌Rv3813c的克
[Abstract]:Cole et al. published the genome sequence and annotation of Mycobacterium tuberculosis H37Rv strain in 1998. Camus et al. revised the genome annotation of H37Rv strain in 2002. The genome information of H37Rv strain provides us with insight into the pathogenesis of tuberculosis and new research and development. Antituberculosis drugs provide a solid foundation. The genome of H37Rv strain is 441 1532 BP in length and contains 4044 genes. It is divided into 11 groups according to its function. Of these, 272 genes encode proteins with unknown function and 1051 genes encode conserved hypothetical protein.
Cell wall is the structural basis for the survival and proliferation of Mycobacterium tuberculosis, and can be used as a target for the development of new anti-tuberculosis drugs. Therefore, identifying new proteins and enzymes related to cell wall metabolism is helpful for us to understand the rules of cell wall biosynthesis, degradation and metabolism and to identify new drug targets.
Arabinogalactan (AG) is a unique structure of the cell wall of Mycobacterium. It is composed of D-Galf-formed polygalactose and D-Araf-formed polyarabinose. Decaprenyl-phospho-arabinose (DPA) is a polyisoprene phospho-arabinose (DPA), but the detailed process of DPA formation is poorly understood. DPA synthesis pathways may involve transferases, phosphatases and differential isomerases. Huang et al. have identified Rv3806c gene product of Mycobacterium tuberculosis as having transferase activity. The candidate genes encoding the differential isomerase have been cloned from Mycobacterium nucleus and their functions are being identified.
Two
The mechanism of DPA formation in Mycobacterium tuberculosis.
The Rv3813c gene encodes a conservative putative protein (Conserved hypothetical).
Protein), using NCBI's Conserved Domain Search Tool and Conserved
Domain Architecture Retrieval Tool analysis of Rv3813c encoded proteins, found
Rv3813c protein has a conserved domain of hydrolases or phosphatase, so this paper
The purpose is (1) to amplify the H37Rv genome from Mycobacterium tuberculosis by PCR.
Rv3813c gene; (2) Rv3813c gene was cloned and its nucleotide sequence was determined; (3) construction.
Construct expression plasmid pET29b-Tb Rv3813c; (4) optimize Rv3813c protein in colon tube
Expression of bacteria BL21 (DE3); (5) purification of Rv3813c protein and purification.
The function of Rv3813c protein was identified.
The results obtained in this paper are as follows:
1. amplification of Rv3813c gene by PCR.
From the genomic database of Mycobacterium tuberculosis H37Rv (http:)
The nucleotide sequence of Rv3813c gene was obtained from //genolist.pasteur.fr/Tuberculist/.
Based on this sequence, PCR primers were designed, and primers Rv3813c-1 and downstream primers were used.
NdeI and XhoI sites were introduced into the 5 'end of Rv3813c-2, respectively, using Vent DNA.
Polymerase has successfully amplified the Rv3813c gene from genomic DNA of H37Rv strain.
2. cloning of Rv3813c gene and determination of its nucleotide sequence
The Rv3813c PCR product was cloned into pSTBlue1 clone plasmid and constructed.
PSTBlue1- Rv3813c recombinant plasmid. Rv3813c for pSTBlue1-Rv3813c (5)
The DNA sequence of the gene was analyzed, and the results showed that Rv3813c was amplified by PCR.
Because the Rv3813c gene is completely consistent with the H37Rv genome database.
There is no nucleotide mutation in the Rv3813c gene, which is cloned.
3. construction of expression plasmid pET29b-Tb Rv3813c
NdeI and XhoI were digested by pSTBlue1-Rv3813c (5).
Rv3813c gene, the purified Rv3813c gene was cloned into NdeI and pET29b.
XhoI locus, pET29b- Rv3813c expression plasmid was constructed and Rv3813c gene expression was constructed.
The Rv3813c protein and its C end were labeled with histidine from the expression plasmid (6 groups).
The fusion protein was formed to facilitate the identification and purification of Rv3813c protein.
Three
Expression of 4. Rv3813c protein in Escherichia coli BL21 (DE3)
(1) BL21 (DE3) was transformed by expression plasmid pET29b-Tb Rv3813c (5).
(2) induction of pET29b-Rv3813c/BL21 with 1 mM IPTG at 37 C.
(DE3) detection and identification of Rv3813c by SDS-PAGE electrophoresis and Western blot.
The results showed that Rv3813c gene could express Rv3813c protein highly.
Quality.
Purification of 5. Rv3813c protein and determination of its enzyme activity
(1) use histidine nickel affinity chromatography gel (HIS-Select HF Nickel Affinity Gel).
Purified Rv3813c protein was detected by SDS-PAGE electrophoresis and Western blot method.
The Rv3813c protein of each eluent (a total of 5 tubes) was identified.
There was a small amount of miscellaneous protein in the eluent, and there was no miscellaneous egg in the other 4 tubes.
It shows that histidine nickel affinity chromatography can effectively purify Rv3813c protein.
The purified Rv3813c protein was desalted and deimidazole to determine its enzyme activity.
(2) determination of phosphatase activity: pNPP method
The reaction system was 0.45 micron g Rv3813c and 1 mM pNPP at 200 L.
The reaction was performed at 550 nm and the phosphatase activity was calculated.
Enzyme activity = 18.3 x 2 x 10-7 x 109 x Absorbance/0.45 g/30 min
= 7.45 x 103 nmol/mg/min
(3) determination of phosphatase activity: Determination of phosphatase activity by DP, PRPP and transferase
The purified Rv3813c protein was labeled with DP (poly ten isoprenoid phosphate) and 14C.
PRPP (ribose pyrophosphate) and high expression transferase (Rv3806c) were incubated.
The products were analyzed by thin layer chromatography.
【學(xué)位授予單位】:大連醫(yī)科大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2005
【分類號(hào)】:Q78
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