Polypeptide Inhibitors for Virus Inhibition
A technology for viruses and uses, applied in the direction of antiviral agents, medical preparations containing active ingredients, peptides, etc., can solve problems such as the inability of mosquito-borne disease vectors to be effectively controlled
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[0084] According to the structures of the conotoxin MrIA and its variants provided by the present invention, various methods can be used to prepare them. Said methods include, but are not limited to: chemical synthesis and recombinant methods. Considering the short length of the polypeptide, chemical synthesis is preferred. A preparation method, for example, comprises the steps of:
[0085] (1) Synthesize crude peptides by chemical synthesis according to the provided amino acid sequence; and
[0086] (2) Purifying the crude peptide obtained in step (1), so as to obtain the conotoxin MrIA or its variants.
[0087] More preferably, when preparing the conotoxin MrIA or its variants, a protecting group is also set on the amino acid side chain of the polypeptide, which is a technique known in the art; making the polypeptide form a cyclic peptide is also known in the art Technology.
[0088] The present invention also includes nucleic acids encoding said conotoxin MrIA and varia...
Embodiment 1
[0101] Example 1. Screening of protease NS2B-NS3 inhibitors and identification of active components from conotoxins
[0102] 1. Preliminary screening of anti-protease NS2B-NS3 active peptides from conotoxins
[0103] Dengue protease NS2B-NS3 fusion protein was expressed (see NS2B and NS3 sequences identified in GenBank Accession No. NP056776). The constructed NS3-NS2B fusion protein expression plasmid PET15b-CF40-linker-NS3pro185 (TSV01) was obtained from Singapore Novartis Institute for Tropical Diseases Pte Ltd (Novartis Institute for Tropical Diseases Pte Ltd) (see LiJ., LimS.P., et al., Functional Profiling of Recombinant NS3Proteases from AllFourSerotypesofDengueVirusUponidesingOcstrapepta Chem. 2005, 280(31): 28766-28774). Transform the recombinant expression plasmid PET15b-CF40-linker-NS3pro185 into Escherichia coli BL21(DE3), induce it with 0.5 MIPTG, and culture it on a constant temperature shaker at 37°C at a speed of 200 rpm for 3 hours; then centrifuge to take the...
Embodiment 2
[0110] Example 2, artificial synthesis of antiviral active peptide MrIA and related mutants
[0111] The synthesis of the antiviral active peptide MrIA and related mutants (listed in Table 1) was completed on a 433A peptide synthesizer (ABI Applied Systems Biological Instruments, Inc.), using solid-phase synthesis technology. The resin used in this synthesis is RinkWang resin, and the amino group is Fmoc-protected amino acid, both of which are produced by AdvancedChemtech Company of the United States. The Fmoc amino acid side chain protecting groups used are respectively: the side chain protecting groups of serine, tyrosine and threonine are tert-butyl (-tBu); histidine, cysteine, glutamine and asparagine The side chain protecting group of lysine and tryptophan is trityl (-Trt); the side chain protecting group of aspartic acid and glutamic acid is tert-butoxy (-OtBu); the side chain protecting group of lysine and tryptophan It is tert-butoxycarbonyl (-Boc); the side chain pro...
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