CN110894224B - Oyster ferritin with high thermal stability and preparation method thereof - Google Patents
Oyster ferritin with high thermal stability and preparation method thereof Download PDFInfo
- Publication number
- CN110894224B CN110894224B CN201911282247.6A CN201911282247A CN110894224B CN 110894224 B CN110894224 B CN 110894224B CN 201911282247 A CN201911282247 A CN 201911282247A CN 110894224 B CN110894224 B CN 110894224B
- Authority
- CN
- China
- Prior art keywords
- ferritin
- oyster
- thermal stability
- high thermal
- seq
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 108050000784 Ferritin Proteins 0.000 title claims abstract description 156
- 238000008416 Ferritin Methods 0.000 title claims abstract description 155
- 102000008857 Ferritin Human genes 0.000 title claims abstract description 153
- 241000237502 Ostreidae Species 0.000 title claims abstract description 128
- 235000020636 oyster Nutrition 0.000 title claims abstract description 128
- 238000002360 preparation method Methods 0.000 title abstract description 7
- 238000000034 method Methods 0.000 claims abstract description 17
- 239000002773 nucleotide Substances 0.000 claims abstract description 11
- 125000003729 nucleotide group Chemical group 0.000 claims abstract description 11
- 238000012870 ammonium sulfate precipitation Methods 0.000 claims abstract description 4
- 238000004440 column chromatography Methods 0.000 claims abstract description 3
- 108090000623 proteins and genes Proteins 0.000 claims description 29
- 239000013612 plasmid Substances 0.000 claims description 19
- 230000014509 gene expression Effects 0.000 claims description 10
- 238000004925 denaturation Methods 0.000 claims description 9
- 230000036425 denaturation Effects 0.000 claims description 9
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 claims description 8
- 229910052921 ammonium sulfate Inorganic materials 0.000 claims description 8
- 235000011130 ammonium sulphate Nutrition 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- 239000006228 supernatant Substances 0.000 claims description 8
- BPHPUYQFMNQIOC-NXRLNHOXSA-N isopropyl beta-D-thiogalactopyranoside Chemical compound CC(C)S[C@@H]1O[C@H](CO)[C@H](O)[C@H](O)[C@H]1O BPHPUYQFMNQIOC-NXRLNHOXSA-N 0.000 claims description 7
- 241000672609 Escherichia coli BL21 Species 0.000 claims description 6
- 238000005119 centrifugation Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 6
- 238000004271 weak anion exchange chromatography Methods 0.000 claims description 5
- 238000011033 desalting Methods 0.000 claims description 4
- 238000000502 dialysis Methods 0.000 claims description 4
- 230000001131 transforming effect Effects 0.000 claims description 4
- 241000588724 Escherichia coli Species 0.000 claims description 3
- GUBGYTABKSRVRQ-WFVLMXAXSA-N DEAE-cellulose Chemical group OC1C(O)C(O)C(CO)O[C@H]1O[C@@H]1C(CO)OC(O)C(O)C1O GUBGYTABKSRVRQ-WFVLMXAXSA-N 0.000 claims description 2
- 238000000605 extraction Methods 0.000 claims description 2
- 239000001963 growth medium Substances 0.000 claims description 2
- 125000003275 alpha amino acid group Chemical group 0.000 claims 1
- 230000035772 mutation Effects 0.000 abstract description 15
- 150000001413 amino acids Chemical group 0.000 abstract description 12
- DHMQDGOQFOQNFH-UHFFFAOYSA-N Glycine Chemical compound NCC(O)=O DHMQDGOQFOQNFH-UHFFFAOYSA-N 0.000 abstract description 8
- 239000004471 Glycine Substances 0.000 abstract description 4
- CKLJMWTZIZZHCS-REOHCLBHSA-N L-aspartic acid Chemical compound OC(=O)[C@@H](N)CC(O)=O CKLJMWTZIZZHCS-REOHCLBHSA-N 0.000 abstract description 4
- 235000003704 aspartic acid Nutrition 0.000 abstract description 4
- OQFSQFPPLPISGP-UHFFFAOYSA-N beta-carboxyaspartic acid Natural products OC(=O)C(N)C(C(O)=O)C(O)=O OQFSQFPPLPISGP-UHFFFAOYSA-N 0.000 abstract description 4
- 230000001766 physiological effect Effects 0.000 abstract description 4
- 238000005349 anion exchange Methods 0.000 abstract description 3
- 239000002994 raw material Substances 0.000 abstract description 2
- 238000001338 self-assembly Methods 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 22
- 235000018102 proteins Nutrition 0.000 description 17
- 102000004169 proteins and genes Human genes 0.000 description 17
- 239000002299 complementary DNA Substances 0.000 description 15
- 239000012634 fragment Substances 0.000 description 14
- QKNYBSVHEMOAJP-UHFFFAOYSA-N 2-amino-2-(hydroxymethyl)propane-1,3-diol;hydron;chloride Chemical compound Cl.OCC(N)(CO)CO QKNYBSVHEMOAJP-UHFFFAOYSA-N 0.000 description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 12
- 238000010438 heat treatment Methods 0.000 description 12
- 239000007788 liquid Substances 0.000 description 10
- 108020004414 DNA Proteins 0.000 description 8
- 238000010276 construction Methods 0.000 description 8
- 239000002245 particle Substances 0.000 description 8
- 102000004190 Enzymes Human genes 0.000 description 7
- 108090000790 Enzymes Proteins 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 7
- 238000012258 culturing Methods 0.000 description 7
- 108020004999 messenger RNA Proteins 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 238000009826 distribution Methods 0.000 description 6
- 238000010828 elution Methods 0.000 description 6
- 239000002244 precipitate Substances 0.000 description 6
- 230000009465 prokaryotic expression Effects 0.000 description 6
- 238000000108 ultra-filtration Methods 0.000 description 6
- 238000004220 aggregation Methods 0.000 description 5
- 230000002776 aggregation Effects 0.000 description 5
- 230000003321 amplification Effects 0.000 description 5
- 238000000855 fermentation Methods 0.000 description 5
- 230000004151 fermentation Effects 0.000 description 5
- 238000003199 nucleic acid amplification method Methods 0.000 description 5
- 238000010186 staining Methods 0.000 description 5
- BFSVOASYOCHEOV-UHFFFAOYSA-N 2-diethylaminoethanol Chemical compound CCN(CC)CCO BFSVOASYOCHEOV-UHFFFAOYSA-N 0.000 description 4
- 241000548230 Crassostrea angulata Species 0.000 description 4
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 4
- 238000000137 annealing Methods 0.000 description 4
- 239000000872 buffer Substances 0.000 description 4
- 239000012154 double-distilled water Substances 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 239000013613 expression plasmid Substances 0.000 description 4
- -1 ferrous iron ions Chemical class 0.000 description 4
- 238000003505 heat denaturation Methods 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 238000000746 purification Methods 0.000 description 4
- 238000010839 reverse transcription Methods 0.000 description 4
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 3
- 230000010718 Oxidation Activity Effects 0.000 description 3
- 239000012045 crude solution Substances 0.000 description 3
- 238000010353 genetic engineering Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000012257 pre-denaturation Methods 0.000 description 3
- 230000035939 shock Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 235000019750 Crude protein Nutrition 0.000 description 2
- 102000012410 DNA Ligases Human genes 0.000 description 2
- 108010061982 DNA Ligases Proteins 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 239000012880 LB liquid culture medium Substances 0.000 description 2
- 238000009004 PCR Kit Methods 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 241001052560 Thallis Species 0.000 description 2
- 238000002835 absorbance Methods 0.000 description 2
- 230000001580 bacterial effect Effects 0.000 description 2
- 238000010805 cDNA synthesis kit Methods 0.000 description 2
- 238000010367 cloning Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000010612 desalination reaction Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 238000004255 ion exchange chromatography Methods 0.000 description 2
- 230000010438 iron metabolism Effects 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 229920002521 macromolecule Polymers 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 235000015097 nutrients Nutrition 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- DPTATFGPDCLUTF-UHFFFAOYSA-N phosphanylidyneiron Chemical compound [Fe]#P DPTATFGPDCLUTF-UHFFFAOYSA-N 0.000 description 2
- 239000012460 protein solution Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000012163 sequencing technique Methods 0.000 description 2
- 210000000952 spleen Anatomy 0.000 description 2
- 238000009210 therapy by ultrasound Methods 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 108091032973 (ribonucleotides)n+m Proteins 0.000 description 1
- CRWFEKLFPVRPBV-CIUDSAMLSA-N Ala-Gln-Met Chemical compound [H]N[C@@H](C)C(=O)N[C@@H](CCC(N)=O)C(=O)N[C@@H](CCSC)C(O)=O CRWFEKLFPVRPBV-CIUDSAMLSA-N 0.000 description 1
- NBTGEURICRTMGL-WHFBIAKZSA-N Ala-Gly-Ser Chemical compound C[C@H](N)C(=O)NCC(=O)N[C@@H](CO)C(O)=O NBTGEURICRTMGL-WHFBIAKZSA-N 0.000 description 1
- SUMYEVXWCAYLLJ-GUBZILKMSA-N Ala-Leu-Gln Chemical compound [H]N[C@@H](C)C(=O)N[C@@H](CC(C)C)C(=O)N[C@@H](CCC(N)=O)C(O)=O SUMYEVXWCAYLLJ-GUBZILKMSA-N 0.000 description 1
- OYJCVIGKMXUVKB-GARJFASQSA-N Ala-Leu-Pro Chemical compound C[C@@H](C(=O)N[C@@H](CC(C)C)C(=O)N1CCC[C@@H]1C(=O)O)N OYJCVIGKMXUVKB-GARJFASQSA-N 0.000 description 1
- PVQLRJRPUTXFFX-CIUDSAMLSA-N Ala-Met-Gln Chemical compound CSCC[C@H](NC(=O)[C@H](C)N)C(=O)N[C@@H](CCC(N)=O)C(O)=O PVQLRJRPUTXFFX-CIUDSAMLSA-N 0.000 description 1
- MUGAESARFRGOTQ-IGNZVWTISA-N Ala-Tyr-Tyr Chemical compound C[C@@H](C(=O)N[C@@H](CC1=CC=C(C=C1)O)C(=O)N[C@@H](CC2=CC=C(C=C2)O)C(=O)O)N MUGAESARFRGOTQ-IGNZVWTISA-N 0.000 description 1
- SNBHMYQRNCJSOJ-CIUDSAMLSA-N Arg-Gln-Asn Chemical compound [H]N[C@@H](CCCNC(N)=N)C(=O)N[C@@H](CCC(N)=O)C(=O)N[C@@H](CC(N)=O)C(O)=O SNBHMYQRNCJSOJ-CIUDSAMLSA-N 0.000 description 1
- JCAISGGAOQXEHJ-ZPFDUUQYSA-N Arg-Gln-Ile Chemical compound CC[C@H](C)[C@@H](C(=O)O)NC(=O)[C@H](CCC(=O)N)NC(=O)[C@H](CCCN=C(N)N)N JCAISGGAOQXEHJ-ZPFDUUQYSA-N 0.000 description 1
- QAXCZGMLVICQKS-SRVKXCTJSA-N Arg-Glu-His Chemical compound C1=C(NC=N1)C[C@@H](C(=O)O)NC(=O)[C@H](CCC(=O)O)NC(=O)[C@H](CCCN=C(N)N)N QAXCZGMLVICQKS-SRVKXCTJSA-N 0.000 description 1
- CYXCAHZVPFREJD-LURJTMIESA-N Arg-Gly-Gly Chemical compound NC(=N)NCCC[C@H](N)C(=O)NCC(=O)NCC(O)=O CYXCAHZVPFREJD-LURJTMIESA-N 0.000 description 1
- CMLGVVWQQHUXOZ-GHCJXIJMSA-N Asn-Ala-Ile Chemical compound [H]N[C@@H](CC(N)=O)C(=O)N[C@@H](C)C(=O)N[C@@H]([C@@H](C)CC)C(O)=O CMLGVVWQQHUXOZ-GHCJXIJMSA-N 0.000 description 1
- HMUKKNAMNSXDBB-CIUDSAMLSA-N Asn-Met-Glu Chemical compound [H]N[C@@H](CC(N)=O)C(=O)N[C@@H](CCSC)C(=O)N[C@@H](CCC(O)=O)C(O)=O HMUKKNAMNSXDBB-CIUDSAMLSA-N 0.000 description 1
- SNYCNNPOFYBCEK-ZLUOBGJFSA-N Asn-Ser-Ser Chemical compound [H]N[C@@H](CC(N)=O)C(=O)N[C@@H](CO)C(=O)N[C@@H](CO)C(O)=O SNYCNNPOFYBCEK-ZLUOBGJFSA-N 0.000 description 1
- ZLGKHJHFYSRUBH-FXQIFTODSA-N Asp-Arg-Asp Chemical compound [H]N[C@@H](CC(O)=O)C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H](CC(O)=O)C(O)=O ZLGKHJHFYSRUBH-FXQIFTODSA-N 0.000 description 1
- PXLNPFOJZQMXAT-BYULHYEWSA-N Asp-Asp-Val Chemical compound CC(C)[C@@H](C(O)=O)NC(=O)[C@H](CC(O)=O)NC(=O)[C@@H](N)CC(O)=O PXLNPFOJZQMXAT-BYULHYEWSA-N 0.000 description 1
- GHODABZPVZMWCE-FXQIFTODSA-N Asp-Glu-Glu Chemical compound OC(=O)C[C@H](N)C(=O)N[C@@H](CCC(O)=O)C(=O)N[C@@H](CCC(O)=O)C(O)=O GHODABZPVZMWCE-FXQIFTODSA-N 0.000 description 1
- TVIZQBFURPLQDV-DJFWLOJKSA-N Asp-His-Ile Chemical compound CC[C@H](C)[C@@H](C(=O)O)NC(=O)[C@H](CC1=CN=CN1)NC(=O)[C@H](CC(=O)O)N TVIZQBFURPLQDV-DJFWLOJKSA-N 0.000 description 1
- LTCKTLYKRMCFOC-KKUMJFAQSA-N Asp-Phe-Leu Chemical compound [H]N[C@@H](CC(O)=O)C(=O)N[C@@H](CC1=CC=CC=C1)C(=O)N[C@@H](CC(C)C)C(O)=O LTCKTLYKRMCFOC-KKUMJFAQSA-N 0.000 description 1
- 241000894006 Bacteria Species 0.000 description 1
- 241001447918 Baoris Species 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- VXDXZGYXHIADHF-YJRXYDGGSA-N Cys-Tyr-Thr Chemical compound [H]N[C@@H](CS)C(=O)N[C@@H](CC1=CC=C(O)C=C1)C(=O)N[C@@H]([C@@H](C)O)C(O)=O VXDXZGYXHIADHF-YJRXYDGGSA-N 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 102000010911 Enzyme Precursors Human genes 0.000 description 1
- 108010062466 Enzyme Precursors Proteins 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 101710157275 Ferritin subunit Proteins 0.000 description 1
- 102000020897 Formins Human genes 0.000 description 1
- 108091022623 Formins Proteins 0.000 description 1
- 241000237858 Gastropoda Species 0.000 description 1
- ODBLJLZVLAWVMS-GUBZILKMSA-N Gln-Asn-Lys Chemical compound C(CCN)C[C@@H](C(=O)O)NC(=O)[C@H](CC(=O)N)NC(=O)[C@H](CCC(=O)N)N ODBLJLZVLAWVMS-GUBZILKMSA-N 0.000 description 1
- CRRFJBGUGNNOCS-PEFMBERDSA-N Gln-Asp-Ile Chemical compound [H]N[C@@H](CCC(N)=O)C(=O)N[C@@H](CC(O)=O)C(=O)N[C@@H]([C@@H](C)CC)C(O)=O CRRFJBGUGNNOCS-PEFMBERDSA-N 0.000 description 1
- LPIKVBWNNVFHCQ-GUBZILKMSA-N Gln-Ser-Leu Chemical compound [H]N[C@@H](CCC(N)=O)C(=O)N[C@@H](CO)C(=O)N[C@@H](CC(C)C)C(O)=O LPIKVBWNNVFHCQ-GUBZILKMSA-N 0.000 description 1
- OKQLXOYFUPVEHI-CIUDSAMLSA-N Gln-Ser-Met Chemical compound CSCC[C@@H](C(=O)O)NC(=O)[C@H](CO)NC(=O)[C@H](CCC(=O)N)N OKQLXOYFUPVEHI-CIUDSAMLSA-N 0.000 description 1
- HTTSBEBKVNEDFE-AUTRQRHGSA-N Glu-Gln-Val Chemical compound CC(C)[C@@H](C(=O)O)NC(=O)[C@H](CCC(=O)N)NC(=O)[C@H](CCC(=O)O)N HTTSBEBKVNEDFE-AUTRQRHGSA-N 0.000 description 1
- ZHNHJYYFCGUZNQ-KBIXCLLPSA-N Glu-Ile-Ser Chemical compound OC[C@@H](C(O)=O)NC(=O)[C@H]([C@@H](C)CC)NC(=O)[C@@H](N)CCC(O)=O ZHNHJYYFCGUZNQ-KBIXCLLPSA-N 0.000 description 1
- ILWHFUZZCFYSKT-AVGNSLFASA-N Glu-Lys-Leu Chemical compound [H]N[C@@H](CCC(O)=O)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CC(C)C)C(O)=O ILWHFUZZCFYSKT-AVGNSLFASA-N 0.000 description 1
- GMVCSRBOSIUTFC-FXQIFTODSA-N Glu-Ser-Glu Chemical compound [H]N[C@@H](CCC(O)=O)C(=O)N[C@@H](CO)C(=O)N[C@@H](CCC(O)=O)C(O)=O GMVCSRBOSIUTFC-FXQIFTODSA-N 0.000 description 1
- DDXZHOHEABQXSE-NKIYYHGXSA-N Glu-Thr-His Chemical compound C[C@H]([C@@H](C(=O)N[C@@H](CC1=CN=CN1)C(=O)O)NC(=O)[C@H](CCC(=O)O)N)O DDXZHOHEABQXSE-NKIYYHGXSA-N 0.000 description 1
- ZTNHPMZHAILHRB-JSGCOSHPSA-N Glu-Trp-Gly Chemical compound C1=CC=C2C(C[C@H](NC(=O)[C@H](CCC(O)=O)N)C(=O)NCC(O)=O)=CNC2=C1 ZTNHPMZHAILHRB-JSGCOSHPSA-N 0.000 description 1
- HHSKZJZWQFPSKN-AVGNSLFASA-N Glu-Tyr-Asp Chemical compound [H]N[C@@H](CCC(O)=O)C(=O)N[C@@H](CC1=CC=C(O)C=C1)C(=O)N[C@@H](CC(O)=O)C(O)=O HHSKZJZWQFPSKN-AVGNSLFASA-N 0.000 description 1
- CUYLIWAAAYJKJH-RYUDHWBXSA-N Gly-Glu-Tyr Chemical compound NCC(=O)N[C@@H](CCC(O)=O)C(=O)N[C@H](C(O)=O)CC1=CC=C(O)C=C1 CUYLIWAAAYJKJH-RYUDHWBXSA-N 0.000 description 1
- DGKBSGNCMCLDSL-BYULHYEWSA-N Gly-Ile-Asn Chemical compound CC[C@H](C)[C@@H](C(=O)N[C@@H](CC(=O)N)C(=O)O)NC(=O)CN DGKBSGNCMCLDSL-BYULHYEWSA-N 0.000 description 1
- SOEGEPHNZOISMT-BYPYZUCNSA-N Gly-Ser-Gly Chemical compound NCC(=O)N[C@@H](CO)C(=O)NCC(O)=O SOEGEPHNZOISMT-BYPYZUCNSA-N 0.000 description 1
- FYVHHKMHFPMBBG-GUBZILKMSA-N His-Gln-Asp Chemical compound C1=C(NC=N1)C[C@@H](C(=O)N[C@@H](CCC(=O)N)C(=O)N[C@@H](CC(=O)O)C(=O)O)N FYVHHKMHFPMBBG-GUBZILKMSA-N 0.000 description 1
- TVMNTHXFRSXZGR-IHRRRGAJSA-N His-Lys-Val Chemical compound [H]N[C@@H](CC1=CNC=N1)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](C(C)C)C(O)=O TVMNTHXFRSXZGR-IHRRRGAJSA-N 0.000 description 1
- DLCOFDAHNMMQPP-SRVKXCTJSA-N Leu-Asp-Leu Chemical compound CC(C)C[C@H](N)C(=O)N[C@@H](CC(O)=O)C(=O)N[C@@H](CC(C)C)C(O)=O DLCOFDAHNMMQPP-SRVKXCTJSA-N 0.000 description 1
- HQUXQAMSWFIRET-AVGNSLFASA-N Leu-Glu-Lys Chemical compound CC(C)C[C@H](N)C(=O)N[C@@H](CCC(O)=O)C(=O)N[C@H](C(O)=O)CCCCN HQUXQAMSWFIRET-AVGNSLFASA-N 0.000 description 1
- RIHIGSWBLHSGLV-CQDKDKBSSA-N Leu-Tyr-Ala Chemical compound [H]N[C@@H](CC(C)C)C(=O)N[C@@H](CC1=CC=C(O)C=C1)C(=O)N[C@@H](C)C(O)=O RIHIGSWBLHSGLV-CQDKDKBSSA-N 0.000 description 1
- 241000737253 Lygodium japonicum Species 0.000 description 1
- NTSPQIONFJUMJV-AVGNSLFASA-N Lys-Arg-Val Chemical compound [H]N[C@@H](CCCCN)C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H](C(C)C)C(O)=O NTSPQIONFJUMJV-AVGNSLFASA-N 0.000 description 1
- YXPJCVNIDDKGOE-MELADBBJSA-N Lys-Lys-Pro Chemical compound C1C[C@@H](N(C1)C(=O)[C@H](CCCCN)NC(=O)[C@H](CCCCN)N)C(=O)O YXPJCVNIDDKGOE-MELADBBJSA-N 0.000 description 1
- ONGCSGVHCSAATF-CIUDSAMLSA-N Met-Ala-Glu Chemical compound CSCC[C@H](N)C(=O)N[C@@H](C)C(=O)N[C@H](C(O)=O)CCC(O)=O ONGCSGVHCSAATF-CIUDSAMLSA-N 0.000 description 1
- AOFZWWDTTJLHOU-ULQDDVLXSA-N Met-Lys-Tyr Chemical compound CSCC[C@H](N)C(=O)N[C@@H](CCCCN)C(=O)N[C@H](C(O)=O)CC1=CC=C(O)C=C1 AOFZWWDTTJLHOU-ULQDDVLXSA-N 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- YBAFDPFAUTYYRW-UHFFFAOYSA-N N-L-alpha-glutamyl-L-leucine Natural products CC(C)CC(C(O)=O)NC(=O)C(N)CCC(O)=O YBAFDPFAUTYYRW-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- XMPUYNHKEPFERE-IHRRRGAJSA-N Phe-Asp-Arg Chemical compound NC(N)=NCCC[C@@H](C(O)=O)NC(=O)[C@H](CC(O)=O)NC(=O)[C@@H](N)CC1=CC=CC=C1 XMPUYNHKEPFERE-IHRRRGAJSA-N 0.000 description 1
- RBRNEFJTEHPDSL-ACRUOGEOSA-N Phe-Phe-Lys Chemical compound C([C@@H](C(=O)N[C@@H](CCCCN)C(O)=O)NC(=O)[C@@H](N)CC=1C=CC=CC=1)C1=CC=CC=C1 RBRNEFJTEHPDSL-ACRUOGEOSA-N 0.000 description 1
- IPFXYNKCXYGSSV-KKUMJFAQSA-N Phe-Ser-Lys Chemical compound C1=CC=C(C=C1)C[C@@H](C(=O)N[C@@H](CO)C(=O)N[C@@H](CCCCN)C(=O)O)N IPFXYNKCXYGSSV-KKUMJFAQSA-N 0.000 description 1
- 241001212699 Pinctada martensii Species 0.000 description 1
- 238000002123 RNA extraction Methods 0.000 description 1
- MAWSJXHRLWVJEZ-ACZMJKKPSA-N Ser-Gln-Cys Chemical compound C(CC(=O)N)[C@@H](C(=O)N[C@@H](CS)C(=O)O)NC(=O)[C@H](CO)N MAWSJXHRLWVJEZ-ACZMJKKPSA-N 0.000 description 1
- RKDFEMGVMMYYNG-WDCWCFNPSA-N Thr-Gln-Leu Chemical compound [H]N[C@@H]([C@@H](C)O)C(=O)N[C@@H](CCC(N)=O)C(=O)N[C@@H](CC(C)C)C(O)=O RKDFEMGVMMYYNG-WDCWCFNPSA-N 0.000 description 1
- QQWNRERCGGZOKG-WEDXCCLWSA-N Thr-Gly-Leu Chemical compound [H]N[C@@H]([C@@H](C)O)C(=O)NCC(=O)N[C@@H](CC(C)C)C(O)=O QQWNRERCGGZOKG-WEDXCCLWSA-N 0.000 description 1
- BKIOKSLLAAZYTC-KKHAAJSZSA-N Thr-Val-Asn Chemical compound [H]N[C@@H]([C@@H](C)O)C(=O)N[C@@H](C(C)C)C(=O)N[C@@H](CC(N)=O)C(O)=O BKIOKSLLAAZYTC-KKHAAJSZSA-N 0.000 description 1
- YYZPVPJCOGGQPC-JYJNAYRXSA-N Tyr-His-Gln Chemical compound [H]N[C@@H](CC1=CC=C(O)C=C1)C(=O)N[C@@H](CC1=CNC=N1)C(=O)N[C@@H](CCC(N)=O)C(O)=O YYZPVPJCOGGQPC-JYJNAYRXSA-N 0.000 description 1
- KSCVLGXNQXKUAR-JYJNAYRXSA-N Tyr-Leu-Glu Chemical compound [H]N[C@@H](CC1=CC=C(O)C=C1)C(=O)N[C@@H](CC(C)C)C(=O)N[C@@H](CCC(O)=O)C(O)=O KSCVLGXNQXKUAR-JYJNAYRXSA-N 0.000 description 1
- COQLPRJCUIATTQ-UHFFFAOYSA-N Uranyl acetate Chemical compound O.O.O=[U]=O.CC(O)=O.CC(O)=O COQLPRJCUIATTQ-UHFFFAOYSA-N 0.000 description 1
- 241000251539 Vertebrata <Metazoa> Species 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 108010024078 alanyl-glycyl-serine Proteins 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- KOSRFJWDECSPRO-UHFFFAOYSA-N alpha-L-glutamyl-L-glutamic acid Natural products OC(=O)CCC(N)C(=O)NC(CCC(O)=O)C(O)=O KOSRFJWDECSPRO-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 108010066119 arginyl-leucyl-aspartyl-serine Proteins 0.000 description 1
- 108010038633 aspartylglutamate Proteins 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000004071 biological effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 210000001185 bone marrow Anatomy 0.000 description 1
- 239000007853 buffer solution Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000009509 drug development Methods 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 238000002296 dynamic light scattering Methods 0.000 description 1
- 238000001976 enzyme digestion Methods 0.000 description 1
- 229960004887 ferric hydroxide Drugs 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 235000013376 functional food Nutrition 0.000 description 1
- 108010055341 glutamyl-glutamic acid Proteins 0.000 description 1
- 108010049041 glutamylalanine Proteins 0.000 description 1
- 108010062266 glycyl-glycyl-argininal Proteins 0.000 description 1
- 108010050848 glycylleucine Proteins 0.000 description 1
- 210000002216 heart Anatomy 0.000 description 1
- 108010040030 histidinoalanine Proteins 0.000 description 1
- 230000000415 inactivating effect Effects 0.000 description 1
- 210000000936 intestine Anatomy 0.000 description 1
- 235000000396 iron Nutrition 0.000 description 1
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 1
- IEECXTSVVFWGSE-UHFFFAOYSA-M iron(3+);oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Fe+3] IEECXTSVVFWGSE-UHFFFAOYSA-M 0.000 description 1
- 210000003734 kidney Anatomy 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 108010034529 leucyl-lysine Proteins 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 210000004185 liver Anatomy 0.000 description 1
- 108010038320 lysylphenylalanine Proteins 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002609 medium Substances 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 210000000496 pancreas Anatomy 0.000 description 1
- 238000009928 pasteurization Methods 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 210000002826 placenta Anatomy 0.000 description 1
- 238000002864 sequence alignment Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 238000002415 sodium dodecyl sulfate polyacrylamide gel electrophoresis Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 210000001519 tissue Anatomy 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000004627 transmission electron microscopy Methods 0.000 description 1
- 229910021642 ultra pure water Inorganic materials 0.000 description 1
- 239000012498 ultrapure water Substances 0.000 description 1
- 210000001835 viscera Anatomy 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- C07K14/435—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
- C07K14/43504—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans from invertebrates
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
- C12N15/09—Recombinant DNA-technology
- C12N15/63—Introduction of foreign genetic material using vectors; Vectors; Use of hosts therefor; Regulation of expression
- C12N15/70—Vectors or expression systems specially adapted for E. coli
Landscapes
- Health & Medical Sciences (AREA)
- Genetics & Genomics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Zoology (AREA)
- Molecular Biology (AREA)
- Biophysics (AREA)
- General Health & Medical Sciences (AREA)
- Biochemistry (AREA)
- Wood Science & Technology (AREA)
- Bioinformatics & Cheminformatics (AREA)
- General Engineering & Computer Science (AREA)
- Biotechnology (AREA)
- Biomedical Technology (AREA)
- Tropical Medicine & Parasitology (AREA)
- Physics & Mathematics (AREA)
- Toxicology (AREA)
- Proteomics, Peptides & Aminoacids (AREA)
- Plant Pathology (AREA)
- Gastroenterology & Hepatology (AREA)
- Microbiology (AREA)
- Medicinal Chemistry (AREA)
- Peptides Or Proteins (AREA)
Abstract
The invention discloses oyster ferritin with high thermal stability and a preparation method thereof, wherein the amino acid sequence of the oyster ferritin is shown as SEQ ID NO.2, aspartic acid at the 120 th site of the wild oyster ferritin is mutated into glycine, and nucleotide is mutated from gcc into gac. The method comprises the following steps: oyster is used as a raw material, oyster ferritin is expressed in a recombinant mode, aspartic acid with negative charges at the triple axis of the ferritin is mutated into uncharged glycine through point mutation, and the oyster ferritin with high purity and high thermal stability is obtained through cell ultrasonic disruption, ammonium sulfate precipitation and weak anion exchange column chromatography. The invention improves the heat stability of the ferritin from 76 ℃ to 87 ℃, and simultaneously has certain physiological activity; the method has the advantages of simple operation and strong condition controllability, can keep the physiological activity of the oyster ferritin at relatively high temperature, still has unique self-assembly characteristics, and has good application prospect.
Description
Technical Field
The invention relates to the technical field of genetic engineering, in particular to oyster ferritin with high thermal stability and a preparation method based on a genetic engineering means.
Background
Ferritin was purified and isolated from spleen of vertebrate horse in 1937, and found to be widely present in spleen, liver, kidney, bone marrow, heart, pancreas, intestine, placenta and other metabolically active tissues and vertebrate blood, and has the characteristics of resistance to dilute acid, pH 2, resistance to dilute alkali, pH 12, and resistance to denaturation at higher temperature of 70-75 deg.C. The ferritin is spherical in shape and comprises protein shell and iron core, wherein the former is an inner cavity structure composed of 24 subunits with high symmetry, and the latter is a non-uniform iron core structure composed of thousands of ferric hydroxide molecules and hundreds of phosphate molecules and can be divided into an iron core surface layer with high phosphorus-iron ratio and an iron core inner layer structure with low phosphorus-iron ratio. Ferritin is widely found in animals, plants and microorganisms. When the content of ferrous iron ions in cells is high, ferritin is catalytically oxidized to generate nontoxic ferric iron through a ferrous iron redox center under the assistance of oxygen and is stored in the ferritin, and 4500 ferric irons can be stored in 1 molecule ferritin at most, which is characterized in that the ferritin is different from other enzymes at most. When cells need iron, ferritin reduces ferric iron into ferrous iron ions under the help of a reducing agent, and releases the ferrous iron ions from the interior of the cells for synthesis and utilization of other proteins, so ferritin has the double effects of removing the toxicity of the ferrous iron ions and regulating the balance of iron metabolism in the cells and has important biological activity. Durand et al have demonstrated that ion exchange chromatography and high performance liquid chromatography can be used to isolate purified ferritin from oyster viscera. A20 kDa band was shown on SDS-PAGE. The results of the amino acid sequence alignment of the oyster ferritin cDNA show that the oyster ferritin cDNA have consistency with pinctada fucata martensii, lygodium japonicum and burgundy snail. Meanwhile, experiments prove that residues responsible for the center of the iron oxide enzyme exist in the oyster ferritin subunit.
At present, because the content of ferritin obtained by natural purification is limited and the ferritin is expensive, ferritin cannot be widely applied to experimental research and drug development systems. The heat denaturation temperature of the natural oyster ferritin is 76 ℃, and although the natural oyster ferritin has relatively good heat resistance, the application of the ferritin is still limited along with the further increase of the temperature. Therefore, the prokaryotic expression of the gene can not only improve the expression efficiency, but also has relatively low price and is suitable for mass production.
Disclosure of Invention
The invention aims to provide oyster ferritin with high thermal stability and a preparation method thereof. The invention changes the amino acid sequence of wild oyster ferritin, thereby changing the environment near the triple axis of the oyster ferritin, improving the heat resistance of the oyster ferritin and enlarging the application range of the oyster ferritin. The invention carries out point mutation on the wild oyster ferritin for the first time, increases the heat resistance of the oyster ferritin and has higher practical significance and application prospect. Can be used for storing iron for human needs or as a carrier for transferring nutrient substances and the like.
The invention constructs a new ferritin by changing the amino acid sequence of wild oyster ferritin through point mutation. The wild oyster ferritin amino acid sequence is provided by NCBI website (Gene ID: LOC105327516), 120 th aspartic acid in the wild oyster ferritin amino acid sequence is mutated into glycine, and nucleotide is mutated from gcc into gac, thus obtaining the oyster ferritin with high thermal stability. Ferritin can be loaded with small molecular substances or other nutrients due to its unique structure, and thus can be used as a transport carrier for transporting substances required by the body. The successful acquisition of the protein can expand the application range of ferritin.
An oyster ferritin with high thermal stability has amino acid sequence shown in SEQ ID NO.2, and molecular weight of 480 kDa; or the amino acid sequence with the same function obtained by deleting, inserting or replacing the amino acid sequence shown as SEQ ID NO. 2.
The nucleotide sequence of the gene mGF1 for coding the oyster ferritin with high thermal stability is shown in SEQ ID No. 1.
The invention also provides a preparation method of the oyster ferritin with high thermal stability, which comprises the following steps:
s1, obtaining a nucleotide sequence for coding the oyster ferritin with high thermal stability, wherein the nucleotide sequence is shown as SEQ ID NO. 1;
s2, inserting the nucleotide sequence into a pET vector to obtain a recombinant plasmid;
s3, transforming the recombinant plasmid into escherichia coli BL21, and performing expression culture;
s4, extracting oyster ferritin with high thermal stability expressed by the escherichia coli BL 21;
preferably, the conditions for the expression culture in step S3 are: to the medium of E.coli BL21 containing the recombinant plasmid was added isopropyl thiogalactoside (IPTG) at a final concentration of 0.6mM, and the mixture was shake-cultured at 28 ℃ for 6 hours.
Preferably, the extraction process of the oyster ferritin with high thermal stability in step S4 is as follows: ultrasonically crushing Escherichia coli BL21 containing recombinant plasmids, centrifuging to obtain supernatant, and sequentially performing ammonium sulfate precipitation, dialysis desalting and weak anion exchange chromatography on the supernatant to obtain the oyster ferritin with high thermal stability.
Preferably, the weak anion exchange chromatography is a DEAE cellulose column chromatography.
Preferably, the rotation speed of the centrifugation is 10000 rpm; the ammonium sulfate is precipitated, and the saturation degree of the ammonium sulfate is 80 percent at 4 ℃.
The heat denaturation temperature of the oyster ferritin with high thermal stability prepared by the invention is measured, the absolute amount of the protein is 1mg, and the result of the measurement shows that the denaturation temperature of the oyster ferritin with high thermal stability is 87 ℃, which is 11 ℃ higher than that of the wild oyster ferritin. Meanwhile, the property analysis of the mutated ferritin after heat treatment shows that the oyster ferritin with high thermal stability still maintains the shell-shaped structure of the hollow protein under a certain temperature condition, and the phenomena of monomer depolymerization and macromolecular aggregation are not found.
The invention prepares acidified FeSO4Slowly adding into oyster ferritin with high thermal stability at 25 deg.C, and measuring Fe catalyzed by ferritin2+Is oxidized into Fe3+The ability of the cell to perform. The result shows that the activity of the oyster ferritin with high thermal stability is 0.4370 ron/subbunit/s (the activity of the wild oyster ferritin is 0.6197 ron/subbunit/s), and the mutated ferritin still has strong oxidation activity.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention purifies the mutated oyster ferritin for the first time, increases the thermal denaturation temperature by 11 ℃, and ensures that the ferritin can still maintain the unique physiological activity at higher temperature.
2. The oyster ferritin with high thermal stability can be used as carrier for embedding active substances or medicines, and can maintain unique hollow cage structure and physiological activity after pasteurization due to the improvement of heat resistance, and can be applied to the development of functional foods.
3. The method for efficiently preparing the oyster ferritin based on the genetic engineering means is convenient and rapid, and a large amount of ferritin can be obtained by mass strain expression and purification, so that the raw material cost in the purification process is greatly reduced, and the manpower and resources are greatly saved. The invention has important significance for the research works such as developing ferritin carriers and regulating iron metabolism balance.
Drawings
FIG. 1 is a graph showing the thermal denaturation temperature (87 ℃) of oyster ferritin having high thermal stability obtained in example 3 of the present invention.
FIG. 2 is a graph showing the distribution of the particle size of oyster ferritin having high thermal stability without heat treatment according to example 3 of the present invention.
FIG. 3 is a graph showing the distribution of the particle size of oyster ferritin having high thermal stability obtained in example 3 of the present invention after heating at 60 ℃ for 10 min.
FIG. 4 is a graph showing the distribution of the particle size of the oyster ferritin having high thermal stability in example 3 of the present invention after heating at 70 ℃ for 10 min.
FIG. 5 is a graph showing the distribution of the particle size of oyster ferritin having high thermal stability obtained in example 3 of the present invention after heating at 80 ℃ for 10 min.
FIG. 6 is a graph showing the distribution of particle size of oyster ferritin having high thermal stability obtained in example 3 of the present invention after heating at 90 ℃ for 10 min.
FIG. 7 is a graph showing the distribution of the particle size of oyster ferritin having high thermal stability obtained in example 3 of the present invention after heating at 100 ℃ for 10 min.
FIG. 8 is a transmission electron microscope negative stain (TEM) of oyster ferritin with high thermal stability obtained in example 3 of the present invention without heat treatment.
FIG. 9 is a transmission electron microscope negative staining image (TEM) of the oyster ferritin with high thermal stability obtained in example 3 of the present invention heated at 60 ℃ for 10 min.
FIG. 10 is a transmission electron microscope negative staining image (TEM) of the oyster ferritin with high thermal stability obtained in example 3 of the present invention heated at 70 ℃ for 10 min.
FIG. 11 is a transmission electron microscope negative staining image (TEM) of the oyster ferritin with high thermal stability obtained in example 3 of the present invention heated at 80 ℃ for 10 min.
FIG. 12 is a transmission electron microscope negative staining image (TEM) of the oyster ferritin with high thermal stability obtained in example 3 of the present invention heated at 90 ℃ for 10 min.
FIG. 13 is a transmission electron microscope negative staining pattern (TEM) of the oyster ferritin with high thermal stability obtained in example 3 of the present invention heated at 100 ℃ for 10 min.
FIG. 14 is a comparison of the oxidation activities of oyster ferritin having high thermal stability obtained in example 4 of the present invention and wild-type oyster ferritin.
Detailed Description
The present invention is further illustrated by the following specific examples, but the scope of the invention is not limited thereto. For process parameters not specifically noted, reference may be made to conventional techniques.
The invention constructs a novel ferritin by changing the amino acid sequence of the ferritin through point mutation. The molecular weight of the ferritin is 480kDa, and the amino acid sequence is shown in SEQ ID NO. 2. Wherein the 120 th aspartic acid is mutated into glycine, and the nucleotide is mutated from gcc into gac (the base sequence is shown as SEQ ID NO. 1).
The amino acid sequence of the wild oyster ferritin is provided by NCBI website (Gene ID: LOC 105327516). The construction of oyster ferritin having high thermal stability is as follows: using oyster ferritin cDNA as a template and SEQ ID NO.3 and SEQ ID NO.4 as primers to amplify a partial GF1DNA fragment 1 containing point mutation; using oyster ferritin cDNA as a template and SEQ ID NO.5 and SEQ ID NO.6 as primers to amplify a partial GF1DNA fragment 2 containing point mutation; amplifying Pacific oyster point mutation ferritin gene mGF 1DNA by using a mixture (molar ratio is 1:1) of GF1DNA fragment 1 and GF1DNA fragment 2 as a template and SEQ ID NO.3 and SEQ ID NO.6 as primers; constructing a prokaryotic expression system BL21-pET21a-mGF1 and carrying out fermentation culture in an LB culture medium; the oyster ferritin with high thermal stability is obtained by purifying through ultrasonic crushing, ammonium sulfate precipitation and DEAE weak anion exchange chromatography.
The invention measures the heat denaturation temperature of the oyster ferritin with high thermal stability, the absolute amount of the protein is 1mg, and the measurement result shows that the denaturation temperature of the oyster ferritin is improved by 11 ℃ due to mutation. Meanwhile, the property analysis of the ferritin after heat treatment shows that the ferritin still maintains the shell-like structure of the hollow protein under a certain temperature condition, and the phenomena of depolymerization of monomers and aggregation of macromolecules are not found.
The invention prepares acidified FeSO4Slowly adding wild type oyster ferritin and oyster ferritin with high thermal stability at 25 deg.C, and measuring Fe catalyzed by ferritin2+Is oxidized into Fe3+The ability of the cell to perform. The results show that the oyster ferritin with high thermal stability still has certain oxidation activity although the activity is slightly reduced.
Example 1
A method for preparing oyster ferritin with high thermal stability comprises the following steps:
s1, construction of oyster ferritin prokaryotic expression BL21-pET21a-mGF1 engineering strain with high thermal stability, comprising the following steps:
s11, oyster RNA extraction: extracting mRNA from fresh Pacific oyster;
s12, construction and amplification of oyster ferritin mGF1 gene (SEQ ID No.1) with high thermal stability: and (5) carrying out reverse transcription by taking the mRNA in the step S11 as a template to obtain Pacific oyster cDNA: PrimeScript was obtained using the kitTM1st Strand cDNA Synthesis Kit (6110A), Takara, Baozi, performed a reverse transcription process. Taking 2. mu.L of Random 6mers, 1. mu.L of dNTP mix, 2. mu.g of template mRNA, ddH2And (3) supplementing O to 10 mu L, uniformly mixing, incubating at 42 ℃ for 30min, heating to 65 ℃, preserving heat for 5min to inactivate enzyme activity, and then quickly cooling on ice to obtain the oyster cDNA.
Amplifying a part GF1DNA fragment 1(SEQ ID NO.7) containing point mutation by using the oyster cDNA as a template and SEQ ID NO.3 and SEQ ID NO.4 as primers; the amplification system is derived from a PCR kit except for the cDNA which is taken as a template: takara LA Baori medical Co
PCR kit (RR002A), using system: 2 μ L of 10 XTaq Buffer, 1 μ L of cDNA template obtained above, 1 μ L of dNTP2 μ L, 1 μ L of primer GF1-F (10nM) (SEQ ID NO.3), 1 μ L of primer GF1-T (10nM) (SEQ ID NO.4), 0.2 μ L of Tapase, and the use of ddH2O was replenished to 20. mu.L. Placing into BIO-RAD PCR instrument, performing pre-denaturation at 95 deg.C for 10min, circulating, performing denaturation at 95 deg.C for 30s, annealing at 52 deg.C for 40s, and extending at 72 deg.C for 1min for 35 times, and finally extending at 72 deg.C for 10min, and amplifying to obtain part GF1DNA fragment 1 containing point mutation;
amplifying a partial GF1DNA fragment 2(SEQ ID NO.8) containing point mutation by using the oyster cDNA as a template and SEQ ID NO.5 and SEQ ID NO.6 as primers; the method comprises the following steps: 2 μ L of 10 XTaq Buffer, 1 μ L of cDNA template obtained above, 2 μ L of dNTP, 1 μ L of primer GF1-P (10nM) (SEQ ID NO.5), 1 μ L of primer GF1-R (10nM) (SEQ ID NO.6), 0.2 μ L of Tapase, and the use of ddH2O was replenished to 20. mu.L. Placing in BIO-RAD PCR instrument, performing pre-denaturation at 95 deg.C for 10min, and performing circulation, performing denaturation at 95 deg.C for 30mins, annealing at 52 ℃ for 40s, extending at 72 ℃ for 1min, circulating for 35 times, finally extending at 72 ℃ for 10min, and amplifying to obtain a partial GF1DNA fragment 2 containing point mutation;
amplifying oyster ferritin gene mGF 1DNA with high thermal stability by taking a mixture (molar ratio is 1:1) of GF1DNA fragment 1 and GF1DNA fragment 2 as a template and SEQ ID NO.3 and SEQ ID NO.6 as primers; the method comprises the following steps: 10 XTaq Buffer 2. mu.L, partial GF1DNA fragment containing point mutations 120 ng, partial GF1DNA fragment containing point mutations 220 ng, dNTP 2. mu.L, primer GF1-F (10nM) (SEQ ID NO.3) 1. mu.L, primer GF1-R (10nM) (SEQ ID NO.6) 1. mu.L, Tap enzyme 0.2. mu.L, using ddH2O was replenished to 20. mu.L. Placing in a BIO-RAD PCR instrument, performing pre-denaturation at 95 ℃ for 10min, then performing circulation, performing denaturation at 95 ℃ for 30s, annealing at 52 ℃ for 40s, performing extension at 72 ℃ for min, performing circulation for 35 times, and finally performing extension at 72 ℃ for 10min, and amplifying to obtain the oyster ferritin mGF1 gene containing point mutation. Cloning a target gene mGF1, transferring the cloned gene into a clone strain Escherichia coli JM109, and carrying out PCR verification and sequencing on a bacterial liquid;
s13, construction and amplification of expression plasmid pET21a-mGF 1: amplifying and culturing the expression plasmid, and amplifying the target gene mGF 1; carrying out double digestion on plasmid pET21a and mGF 1DNA by using BamH I and Xho I respectively, and connecting double digested pET21a and GF1DNA fragments by using T4 DNA Ligase to obtain a recombinant plasmid pET21a-mGF 1; the recombinant plasmid pET21a-mGF1 was heat shock transformed into the clonal strain JM 109;
s14, construction of prokaryotic expression system BL21-pET21a-mGF 1: extracting the recombinant plasmid pET21a-mGF1, transforming the recombinant plasmid into an engineering strain BL21(DE3), preparing an engineering strain BL21-pET21a-mGF1, and storing the strain at-80 ℃;
s2, culturing engineering strains, inducing expression and separating and purifying: adding the engineering strain into LB liquid culture medium, culturing at 37 deg.C and 180rpm for 3h, and measuring absorbance OD of the fermentation liquid by ultraviolet spectrophotometer600When OD is reached600Adding isopropyl thiogalactoside (IPTG) with final concentration of 0.6mM for induction expression, culturing at 28 deg.C for 6 hr to obtain zymogen liquid, centrifuging at 4 deg.C and 10000rpm for 15min, and dissolving precipitate in crude protein extractive solutionIn 5 times volume of buffer solution 50mM Tris-HCl (pH 7), the power of 300W, the ultrasonic time is 3s, the ultrasonic is stopped for 5s, the total time is 15min (including the time of ultrasonic and stopping), after the thalli obtained by ultrasonic crushing and fermentation are subjected to ultrasonic crushing, the crushed thalli is centrifuged at 10000rpm for 15min, the supernatant is added with ammonium sulfate with the saturation of 80%, the mixture is stirred for 30min, the mixture is kept stand at 4 ℃ for 6h and centrifuged at 10000rpm for 15min, the precipitate is re-dissolved in 50mM Tris-HCl (pH 7) with the mass of 10 times that of the precipitate, the solution is dialyzed by using a dialysis bag with the molecular weight of 3500Da, the solution is dialyzed by using 100 times volume of 0.05mol/L Tris-HCl (pH 7), the dialysate is exchanged once every 6h, and the ammonium sulfate in the protein solution is removed, so that the crude oyster ferritin the protein is obtained. Filtering the dialyzed liquid by using a 0.45-micron water-based filter membrane to obtain an oyster ferritin crude solution; purifying the crude oyster ferritin solution obtained in the step S5 by using a DEAE weak anion exchange column; eluting the positively charged ferritin in crude solution of oyster ferritin with 50mM Tris-HCl (pH 7) as mobile phase solution; the flow rate of the mobile phase is 2mL/min, and the protein elution peak is detected by ultraviolet at 280 nm; collecting protein elution peak, concentrating and desalting with 100kDa ultrafiltration centrifuge tube, and ultrafiltering the ferritin elution peak at 5000rpm for 10 min; after the ultrafiltration is carried out once, pure water is supplemented into the inner sleeve of the ultrafiltration centrifugal pipe to the volume before the centrifugation, and the centrifugation condition is repeated for three times; obtaining the oyster ferritin solution with high thermal stability which is purified after concentration and desalination.
Comparative example 1
S1, construction of a wild oyster ferritin prokaryotic expression BL21-pET21a-GF1 engineering strain, which comprises the following steps:
s11, extracting wild oyster ferritin RNA: extracting mRNA from fresh oyster;
s12, amplification of wild oyster ferritin GF1 gene: reverse transcription is carried out on the mRNA in the step S11 to obtain oyster ferritin cDNA by taking the mRNA as a template; PrimeScript was obtained using the kitTM1st Strand cDNA Synthesis Kit (6110A), Takara, Baozi, performed a reverse transcription process. Taking 2 μ L of Random 6mers, 1 μ L of dNTP mix, 2 μ g of template mRNA, ddH2Adding O to 10 μ L, mixing, incubating at 42 deg.C for 30min, heating to 65 deg.C, keeping the temperature for 5min, inactivating enzyme, and rapidly freezing on iceCooling to obtain the oyster cDNA.
Amplifying GF1DNA (SEQ ID NO.9) by taking the oyster cDNA as a template and SEQ ID NO.3 and SEQ ID NO.6 as primers; the method comprises the following steps: 10 μ L of Tap Buffer, 1 μ L of the above-obtained cDNA template, 2 μ L of dNTP, 1 μ L of primer GF1-F (10nM) (SEQ ID NO.3), 1 μ L of primer GF1-R (10nM) (SEQ ID NO.6), 0.2 μ L of Tap enzyme, and purification by ddH2O was replenished to 20. mu.L. Placing into BIO-RAD PCR instrument, pre-denaturing at 95 deg.C for 10min, circulating, denaturing at 95 deg.C for 30s, annealing at 52 deg.C for 40s, and extending at 72 deg.C for 1min, for 35 times, and finally extending at 72 deg.C for 10 min. Amplifying to obtain the gene containing wild oyster ferritin GF 1. After cloning the target gene GF1, transferring the cloned gene into a clone strain GM109, and carrying out PCR verification and sequencing on bacterial liquid.
S13, construction and amplification of wild oyster ferritin expression plasmid pET21a-GF 1: amplifying and culturing an expression plasmid, and amplifying a target gene GF 1; BamHI and XhoI are used for carrying out double enzyme digestion on plasmid pET21a and GF1DNA respectively, and T4 DNA Ligase is used for connecting double enzyme digested pET21a and GF1DNA fragments to obtain a recombinant plasmid pET21a-GF 1; the recombinant plasmid pET21a-GF1 is transformed into a clonal strain JM109 by heat shock, and the conditions of the heat shock transformation are that the recombinant plasmid is heated at 42 ℃ for 45s and then placed on ice for 1 min;
s14, construction of prokaryotic expression system BL21-pET21a-GF 1: extracting the recombinant plasmid pET21a-GF1, transforming the recombinant plasmid into an engineering strain BL21(DE3) to prepare an engineering strain BL21-pET21a-GF1, and storing the strain at 80 ℃ below zero (the ratio of the bacterium liquid to 40% glycerol is 1: 1);
s2, culturing engineering strains, inducing expression and separating and purifying: adding the engineering strain into LB liquid culture medium, culturing at 37 deg.C and 180rpm for 3h, and measuring absorbance OD of the fermentation liquid by ultraviolet spectrophotometer600When OD is reached600When the concentration is 0.6, isopropyl thiogalactoside (IPTG) with the final concentration of 0.6mM is added for induction expression, and the culture is continued for 6h under the condition of 28 ℃ to obtain zymocyte liquid. Centrifuging at 4 deg.C at 10000rpm for 15min, dissolving the precipitate in buffer 50mM Tris-HCl (pH 7) with volume 5 times of the volume of the crude protein extractive solution, performing ultrasonic treatment at power of 300W for 3s, stopping the ultrasonic treatment for 5s, and performing ultrasonic disruption and fermentation for 15minAnd (2) centrifuging the crushed thallus liquid at 10000rpm for 15min, adding ammonium sulfate with the saturation of 80% into the supernatant, stirring for 30min, standing at 4 ℃ for 6h, centrifuging at 10000rpm for 15min, re-dissolving the precipitate in 50mM Tris-HCl (pH 8) with the mass 10 times that of the precipitate, dialyzing the solution by using a dialysis bag with the molecular weight of 3500Da, dialyzing the solution by using 0.05mol/L Tris-HCl (pH 7) with the volume of 100 times, changing the dialyzate every 6h, dialyzing for 6 times, and removing the ammonium sulfate in the protein solution to obtain the crude oyster ferritin extract. Filtering the dialyzed liquid by using a 0.45-micron water-based filter membrane to obtain an oyster ferritin crude solution; purifying the crude oyster ferritin solution obtained in the step S5 by using a DEAE weak anion exchange column; eluting the positively charged protein in the crude oyster ferritin solution by using 50mM Tris-HCl (pH 7) as a mobile phase solution; eluting the negatively charged protein adsorbed on the DEAE column with 50mM Tris-HCl (pH 7) containing 1M NaCl at a flow rate of 2mL/min, and detecting the protein elution peak at 280nm by UV; collecting protein elution peak, concentrating and desalting with 100kDa ultrafiltration centrifuge tube, and ultrafiltering the ferritin elution peak at 5000rpm for 10 min; after the ultrafiltration is carried out once, pure water is supplemented into the inner sleeve of the ultrafiltration centrifugal pipe to the volume before the centrifugation, and the centrifugation condition is repeated for three times; obtaining the wild oyster ferritin solution which is purified after concentration and desalination.
Example 3
The oyster ferritin solution having high thermal stability obtained in example 1 was sampled and measured for thermal stability using a differential scanning calorimeter. The thermostable oyster ferritin solution was diluted to 5mg/mL with 50mM Tris-HCl (pH 7), and 200 μ L of the sample was accurately pipetted, placed in an aluminum pan and immediately sealed. The deionized water with the same mass is used as a reference, the scanning starting temperature is 20 ℃, the termination temperature is 100 ℃, and the heating rate is 1 ℃/min. The results of the experiment are shown in FIG. 1.
The oyster ferritin solution with high thermal stability obtained in example 1 was diluted to 0.5mg/mL with 50mM Tris-HCl (pH 7), heated at 60, 70, 80, 90 and 100 ℃ for 10min while untreated oyster ferritin solution with high thermal stability was used as a control, centrifuged at 10000rpm for 10min, and the supernatant was taken out after the precipitation to prepare a sample a to be tested. Analysis of the oyster ferritin aggregation phenomenon with high thermal stability using dynamic light scattering: 200 mu L of the sample A to be measured is placed in a micro measuring tube, the measuring angle is 90 degrees, the measuring time is 30s, and each experiment is repeated three times to obtain an average value. The results of the curve fitting using the software are shown in FIGS. 2-7.
The oyster ferritin solution with high thermal stability obtained in example 1 was diluted to 0.2mg/mL with 50mM Tris-HCl (pH 7), heated at 60, 70, 80, 90 and 100 ℃ for 10min while untreated oyster ferritin solution with high thermal stability was used as a control, centrifuged at 10000rpm for 10min, and the supernatant was removed after precipitation and used as sample B. Analysis of the appearance of oyster ferritin with high thermal stability using transmission electron microscopy: dripping 10 mu L of the sample B to be detected on a copper net attached with a carbon film, and sucking the sample B to be detected by filter paper after 5 minutes; 10 mu L of uranyl acetate (2%) is dropped on a copper net and kept for 5 minutes, and then is sucked dry by filter paper; the protein was placed on a transmission electron microscope and observed for morphology using a voltage of 80 kV. The same samples were observed in different areas to avoid experimental errors, and the results are shown in FIGS. 8-13.
Example 4
The oyster ferritin solution having high thermal stability obtained in example 1 and the wild-type oyster ferritin solution shown in comparative example 1 were sampled, and the samples were diluted to 0.5mg/mL with 50mM Mops (pH 7) according to the ratio of ferritin: FeSO4(10mM, prepared using pH 2.0 ultrapure water) acidified FeSO was added at a ratio of 5:1 (volume ratio)4Slowly dripping into ferritin solution, detecting ultraviolet absorption value at 300nm in the measurement process with ultraviolet spectrophotometer, stopping scanning and storing data when the light absorption value rises until it is flat. The data were derived to determine the rate of oxidative precipitation of ferritin. The results of the experiment are shown in FIG. 14.
Figure 1 shows that the heat denaturation temperature of oyster ferritin with high thermal stability is 87 ℃. FIGS. 2 to 7 show that the particle size of oyster ferritin with high thermal stability is about 12nm when untreated, and the particle size of ferritin slightly increases with increasing temperature, but no significant aggregation of macromolecules is observed. FIGS. 8 to 13 show that the oyster ferritin with high thermal stability shows a clear white protein shell-like structure after negative dyeing when untreated; with the temperature rise, the ferritin still maintains an obvious and uniformly distributed structure, obvious aggregation occurs at 100 ℃, but the morphology of the protein is still visible. FIG. 14 shows that the rate of iron oxidation precipitation of oyster ferritin with high thermal stability is 0.4370 ron/subbunit/s, which is slightly lower than that of wild type oyster ferritin (0.6197 ron/subbunit/s), but still has strong oxidative activity.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.
Sequence listing
<110> university of Dalian Industrial university
<120> oyster ferritin with high thermal stability and preparation method thereof
<130> ZR191425LQ
<160> 9
<170> SIPOSequenceListing 1.0
<210> 1
<211> 516
<212> DNA
<213> Artificial Sequence (Artificial Sequence)
<400> 1
atggccgaat cccaatgtcg ccaaaattac caccaggaga gcgaagctgg catcaaccgc 60
caaatcaaca tggaactgta tgcctgctat acctaccagt ccatggccta ctacttcgat 120
agagatgatg tggcccttcc gggattcagc aagttcttca agaattcatc agatgaagaa 180
cgggaacatg ctgaaaaact gatgaagtac caaaataaga gaggagggcg tgtcgtgctc 240
caagacatca agaaacccga ccgtgatgag tggggcaccg gcttggacgc catgcaggtg 300
gcgctacagc tggagaagac tgtgaaccag tctctgcttg accttcacaa ggtcgctggc 360
agtcaccagg atgcacagat gtgcgatttc cttgagaccc actacttgga ggagcaagtg 420
aacgccatca aggagatatc ggaccacatc actcagttga agagagtggg cagtgggctg 480
ggagagtatg aatacgatcg ccgcctcgac tcctaa 516
<210> 2
<211> 171
<212> PRT
<213> Artificial Sequence (Artificial Sequence)
<400> 2
Met Ala Glu Ser Gln Cys Arg Gln Asn Tyr His Gln Glu Ser Glu Ala
1 5 10 15
Gly Ile Asn Arg Gln Ile Asn Met Glu Leu Tyr Ala Cys Tyr Thr Tyr
20 25 30
Gln Ser Met Ala Tyr Tyr Phe Asp Arg Asp Asp Val Ala Leu Pro Gly
35 40 45
Phe Ser Lys Phe Phe Lys Asn Ser Ser Asp Glu Glu Arg Glu His Ala
50 55 60
Glu Lys Leu Met Lys Tyr Gln Asn Lys Arg Gly Gly Arg Val Val Leu
65 70 75 80
Gln Asp Ile Lys Lys Pro Asp Arg Asp Glu Trp Gly Thr Gly Leu Asp
85 90 95
Ala Met Gln Val Ala Leu Gln Leu Glu Lys Thr Val Asn Gln Ser Leu
100 105 110
Leu Asp Leu His Lys Val Ala Gly Ser His Gln Asp Ala Gln Met Cys
115 120 125
Asp Phe Leu Glu Thr His Tyr Leu Glu Glu Gln Val Asn Ala Ile Lys
130 135 140
Glu Ile Ser Asp His Ile Thr Gln Leu Lys Arg Val Gly Ser Gly Leu
145 150 155 160
Gly Glu Tyr Glu Tyr Asp Arg Arg Leu Asp Ser
165 170
<210> 3
<211> 20
<212> DNA
<213> Artificial Sequence (Artificial Sequence)
<400> 3
<210> 4
<211> 30
<212> DNA
<213> Artificial Sequence (Artificial Sequence)
<400> 4
atcctggtga ctgccagcga ccttgtgaag 30
<210> 5
<211> 30
<212> DNA
<213> Artificial Sequence (Artificial Sequence)
<400> 5
cttcacaagg tcgctggcag tcaccaggat 30
<210> 6
<211> 20
<212> DNA
<213> Artificial Sequence (Artificial Sequence)
<400> 6
<210> 7
<211> 372
<212> DNA
<213> Artificial Sequence (Artificial Sequence)
<400> 7
atggccgaat cccaatgtcg ccaaaattac caccaggaga gcgaagctgg catcaaccgc 60
caaatcaaca tggaactgta tgcctgctat acctaccagt ccatggccta ctacttcgat 120
agagatgatg tggcccttcc gggattcagc aagttcttca agaattcatc agatgaagaa 180
cgggaacatg ctgaaaaact gatgaagtac caaaataaga gaggagggcg tgtcgtgctc 240
caagacatca agaaacccga ccgtgatgag tggggcaccg gcttggacgc catgcaggtg 300
gcgctacagc tggagaagac tgtgaaccag tctctgcttg accttcacaa ggtcgctggc 360
agtcaccagg at 372
<210> 8
<211> 174
<212> DNA
<213> Artificial Sequence (Artificial Sequence)
<400> 8
cttcacaagg tcgctggcag tcaccaggat gcacagatgt gcgatttcct tgagacccac 60
tacttggagg agcaagtgaa cgccatcaag gagatatcgg accacatcac tcagttgaag 120
agagtgggca gtgggctggg agagtatgaa tacgatcgcc gcctcgactc ctaa 174
<210> 9
<211> 516
<212> DNA
<213> Pacific oyster (Crassostra gigas)
<400> 9
atggccgaat cccaatgtcg ccaaaattac caccaggaga gcgaagctgg catcaaccgc 60
caaatcaaca tggaactgta tgcctgctat acctaccagt ccatggccta ctacttcgat 120
agagatgatg tggcccttcc gggattcagc aagttcttca agaattcatc agatgaagaa 180
cgggaacatg ctgaaaaact gatgaagtac caaaataaga gaggagggcg tgtcgtgctc 240
caagacatca agaaacccga ccgtgatgag tggggcaccg gcttggacgc catgcaggtg 300
gcgctacagc tggagaagac tgtgaaccag tctctgcttg accttcacaa ggtcgctgac 360
agtcaccagg atgcacagat gtgcgatttc cttgagaccc actacttgga ggagcaagtg 420
aacgccatca aggagatatc ggaccacatc actcagttga agagagtggg cagtgggctg 480
ggagagtatg aatacgatcg ccgcctcgac tcctaa 516
Claims (10)
1. An oyster ferritin with high thermal stability is characterized in that the amino acid sequence is shown in SEQ ID NO. 2.
2. The oyster ferritin with high thermal stability according to claim 1, characterised in that the denaturation temperature is 87 ℃ when the absolute amount of oyster ferritin with high thermal stability is 1 mg.
3. The oyster ferritin with high thermal stability according to claim 1, characterised in that its activity is 0.4370 ron/subbunit/s.
4. The gene mGF1 encoding the oyster ferritin having high thermostability according to claim 1, whose nucleotide sequence is shown in SEQ ID No. 1.
5. A method for preparing oyster ferritin with high thermal stability is characterized by comprising the following steps:
s1, obtaining a nucleotide sequence for coding the oyster ferritin with high thermal stability according to claim 1, wherein the nucleotide sequence is shown as SEQ ID NO. 1;
s2, inserting the nucleotide sequence into a pET vector to obtain a recombinant plasmid;
s3, transforming the recombinant plasmid into escherichia coli BL21, and carrying out expression culture;
s4, extracting oyster ferritin with high thermal stability expressed by the Escherichia coli BL 21.
6. The method for preparing oyster ferritin with high thermal stability according to claim 5, wherein the conditions of the expression culture in step S3 are: to the culture medium of E.coli BL21 containing the recombinant plasmid was added isopropyl thiogalactoside to a final concentration of 0.6mM, and the mixture was shake-cultured at 28 ℃ for 6 hours.
7. The method for preparing oyster ferritin with high thermal stability in claim 5, wherein the extraction process of oyster ferritin with high thermal stability in step S4 is as follows: ultrasonically crushing Escherichia coli BL21 containing recombinant plasmids, centrifuging to obtain supernatant, and sequentially performing ammonium sulfate precipitation, dialysis desalting and weak anion exchange chromatography on the supernatant to obtain the oyster ferritin with high thermal stability.
8. The method for preparing oyster ferritin with high thermal stability according to claim 7, wherein the weak anion exchange chromatography is DEAE cellulose column chromatography.
9. The method for preparing oyster ferritin with high thermal stability in claim 7 wherein the rotation speed of the centrifugation is 10000 rpm.
10. The method for preparing oyster ferritin with high thermal stability as claimed in claim 7 wherein the ammonium sulfate is precipitated at 4 ℃ and 80% saturation with ammonium sulfate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911282247.6A CN110894224B (en) | 2019-12-13 | 2019-12-13 | Oyster ferritin with high thermal stability and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911282247.6A CN110894224B (en) | 2019-12-13 | 2019-12-13 | Oyster ferritin with high thermal stability and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110894224A CN110894224A (en) | 2020-03-20 |
| CN110894224B true CN110894224B (en) | 2022-06-24 |
Family
ID=69788377
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911282247.6A Active CN110894224B (en) | 2019-12-13 | 2019-12-13 | Oyster ferritin with high thermal stability and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110894224B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113444715B (en) * | 2021-07-15 | 2022-09-30 | 中国农业大学 | Method for realizing graded embedding and gradual release of binary components through ferritin three-dimensional assembly |
| CN115998708A (en) * | 2022-07-04 | 2023-04-25 | 大连工业大学 | Method for embedding active molecules by reversible self-assembled protein |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1818062A (en) * | 2005-02-07 | 2006-08-16 | 梁惠 | Anti senescence related iron-protein gene of Amphioxus |
| CN102051363A (en) * | 2009-10-30 | 2011-05-11 | 中国科学院海洋研究所 | Clam ferroprotein gene as well as coding protein and application of in vitro recombinant expression product of same |
| CN102850449A (en) * | 2012-10-11 | 2013-01-02 | 中国海洋大学 | Patinopecten yessoensis ferritin gene and application thereof |
-
2019
- 2019-12-13 CN CN201911282247.6A patent/CN110894224B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1818062A (en) * | 2005-02-07 | 2006-08-16 | 梁惠 | Anti senescence related iron-protein gene of Amphioxus |
| CN102051363A (en) * | 2009-10-30 | 2011-05-11 | 中国科学院海洋研究所 | Clam ferroprotein gene as well as coding protein and application of in vitro recombinant expression product of same |
| CN102850449A (en) * | 2012-10-11 | 2013-01-02 | 中国海洋大学 | Patinopecten yessoensis ferritin gene and application thereof |
Non-Patent Citations (5)
| Title |
|---|
| Han Li 等.LWT - Food Science and Technology point mutation.《Food Chemistry》.2020,第346卷 * |
| Han Li 等.Purification and characterizations of a nanocage ferritin GF1 from oyster (Crassostrea gigas).《LWT - Food Science and Technology》.2020,第127卷 * |
| Han Li 等.Thermal treatment modified the physicochemical properties of recombinant oyster (Crassostrea gigas) ferritin.《Food Chemistry》.2020,第314卷 * |
| Li，H. 等.PDB:6LJG_A,Chain A,Ferritin.《Genbank》.2020, * |
| 李晗 等.牡蛎重组铁蛋白GF1的原核表达、分离纯化及表征.《中国食品科学技术学会第十六届年会暨第十届中美食品业高层论坛摘要集》.2019, * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110894224A (en) | 2020-03-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110894224B (en) | Oyster ferritin with high thermal stability and preparation method thereof | |
| CN106986922B (en) | Self-assembled amphiphilic short peptide and application thereof | |
| CN111704663A (en) | Preparation method of collagen hydrogel | |
| Zhang et al. | Thermostability of protein nanocages: the effect of natural extra peptide on the exterior surface | |
| CN105985968A (en) | Improved broad-spectrum endonuclease and industrial production method thereof | |
| WO2003106494A1 (en) | A human collagen-like protein and the method of producing it | |
| CN111875676A (en) | P49 mutant protein of African swine fever virus immunogen, recombinant vector, Escherichia coli genetic engineering bacteria, preparation method and application | |
| CN114277004A (en) | High-temperature-resistant recombinant mutant SOD (superoxide dismutase), and coding gene and application thereof | |
| CN113308456B (en) | D-psicose 3-epimerase mutant with enhanced thermal stability | |
| CN110759986B (en) | Efficient preparation method of reversible self-assembled protein | |
| CN111893105A (en) | Cas9 protein expression and purification method | |
| CN113647591B (en) | Royal jelly zymolyte and preparation method and application thereof | |
| CN102628058A (en) | Preparation of recombinant human nerve growth factor ( rhNGF ) protein and renaturation solution | |
| CN113416725A (en) | Recombinant chondroitinase ABC-I protein and preparation method and application thereof | |
| CN113151343A (en) | Preparation method of saccharomyces cerevisiae expression long-acting recombinant human EGF-HSA fusion protein and standard thereof | |
| CN113444721A (en) | Artificial modified gene, SNA15protein and method for efficiently synthesizing nano-silver by using SNA15protein | |
| CN108265040B (en) | Transposase high-activity mutant in halophilic archaea | |
| CN109055419B (en) | Construction method and application of recombinant microorganism with phosphorus-solubilizing activity | |
| CN110029093B (en) | Recombinant glucose dehydrogenase and preparation method and encoding gene thereof | |
| CN110016472B (en) | DTE immobilized nano-microsphere, preparation method thereof and method for producing D-psicose based on DTE immobilized nano-microsphere | |
| CN115216463B (en) | Recombinant trypsin with stability and preparation method and application thereof | |
| CN115896048B (en) | Recombinant human Cu, zn-SOD with high enzyme activity and good stability, and preparation method and application thereof | |
| CN117603934B (en) | Uricase purification method | |
| CN104404049B (en) | One Hylemyia Platura Meigen alexin mutant and its production and use | |
| CN114249814B (en) | Albumin HSA-hydrohopbic-IIIB with self-assembly performance and application thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |