Difference between revisions of "Part:BBa K3733038"
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| − | <p> | + | <p>Geosmin synthase from <i>Streptomyces coelicolor</i> A3(2) (<b>ScGS</b>) is a single 726-amino acid protein which catalyzes the Mg<sup>2+</sup> dependent conversion of farnesyl diphosphate to a mixture including geosmin. A 6×His tag is added in its C-terminal to make it accessible for Ni-NTA purification.</p> |
===Usage and Biology=== | ===Usage and Biology=== | ||
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<p>The ScGS is a bifunctional sesquiterpene cyclase, with the presence of Mg<sup>2+</sup>, the N-terminal half of this protein catalyzes the ionization and cyclization of farnesyl diphosphate to form germacradienol and inorganic pyrophosphate(PP<sub>i</sub>). Then the C-terminal domain, highly homologous with the former, catalyzes the protonation, cyclization, and fragmentation of germacradienol to form geosmin and acetone.</p> | <p>The ScGS is a bifunctional sesquiterpene cyclase, with the presence of Mg<sup>2+</sup>, the N-terminal half of this protein catalyzes the ionization and cyclization of farnesyl diphosphate to form germacradienol and inorganic pyrophosphate(PP<sub>i</sub>). Then the C-terminal domain, highly homologous with the former, catalyzes the protonation, cyclization, and fragmentation of germacradienol to form geosmin and acetone.</p> | ||
===Sequence and Features=== | ===Sequence and Features=== | ||
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===Functional Parameters=== | ===Functional Parameters=== | ||
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| + | <p>To obtain the protein, pET-28a(+)-ScGS(with His-tag) was transferred into <i>E.coli</i> BL21(DE3), and the cells were inoculated in 25 mL cultures of LB medium with 10 μg/mL kanamycin. These cultures were grown at 37℃ with 250 rpm shaking until the OD<sub>600</sub> reached 0.5-0.8, then 0.3 mM isopropyl <i>β</i>-D-1-thiogalactopyranoside(IPTG) were added, following by an overnight cultivation at 16℃ with 250 rpm shaking to induce protein expression. The washed and harvested cells were resuspended with a Binding Buffer, and then the cells were lysed by ultrasonication. Purification was performed according to the protocol of Ni-NTA Sefinose<sup>TM</sup> Resin (Sangon Biotech, Shanghai, China). As it shows in the following figure(<b>Figure 1.</b>), the existence of ScGS with a 6×His tag in our chasis was proved by SDS-PAGE analysis.</p> | ||
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| − | <center><img src=" | + | <center><img src="https://static.igem.org/mediawiki/parts/3/35/T--HZAU-China--ScGS-1.png |
| − | <center><b>Figure 1. </b>SDS-PAGE analysis of ScGS with | + | " style="width:389px;height:405px"></center> |
| + | <center><b>Figure 1. </b>SDS-PAGE analysis of ScGS with 6×His tag expression </center> | ||
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| − | < | + | <h3>References</h3> |
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| + | [1] Harris G G, Lombardi P M, Pemberton T A, et al. Structural Studies of Geosmin Synthase, a Bifunctional Sesquiterpene Synthase with αα Domain Architecture That Catalyzes a Unique Cyclization–Fragmentation Reaction Sequence[J]. Biochemistry, 2015, 54(48): 7142-7155. | ||
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Latest revision as of 10:05, 21 October 2021
ScGS with a His-tag
Geosmin synthase from Streptomyces coelicolor A3(2) (ScGS) is a single 726-amino acid protein which catalyzes the Mg2+ dependent conversion of farnesyl diphosphate to a mixture including geosmin. A 6×His tag is added in its C-terminal to make it accessible for Ni-NTA purification.
Usage and Biology
The ScGS is a bifunctional sesquiterpene cyclase, with the presence of Mg2+, the N-terminal half of this protein catalyzes the ionization and cyclization of farnesyl diphosphate to form germacradienol and inorganic pyrophosphate(PPi). Then the C-terminal domain, highly homologous with the former, catalyzes the protonation, cyclization, and fragmentation of germacradienol to form geosmin and acetone.
Sequence and Features
- 10COMPATIBLE WITH RFC[10]
- 12COMPATIBLE WITH RFC[12]
- 21COMPATIBLE WITH RFC[21]
- 23COMPATIBLE WITH RFC[23]
- 25COMPATIBLE WITH RFC[25]
- 1000COMPATIBLE WITH RFC[1000]
Functional Parameters
To obtain the protein, pET-28a(+)-ScGS(with His-tag) was transferred into E.coli BL21(DE3), and the cells were inoculated in 25 mL cultures of LB medium with 10 μg/mL kanamycin. These cultures were grown at 37℃ with 250 rpm shaking until the OD600 reached 0.5-0.8, then 0.3 mM isopropyl β-D-1-thiogalactopyranoside(IPTG) were added, following by an overnight cultivation at 16℃ with 250 rpm shaking to induce protein expression. The washed and harvested cells were resuspended with a Binding Buffer, and then the cells were lysed by ultrasonication. Purification was performed according to the protocol of Ni-NTA SefinoseTM Resin (Sangon Biotech, Shanghai, China). As it shows in the following figure(Figure 1.), the existence of ScGS with a 6×His tag in our chasis was proved by SDS-PAGE analysis.
References
[1] Harris G G, Lombardi P M, Pemberton T A, et al. Structural Studies of Geosmin Synthase, a Bifunctional Sesquiterpene Synthase with αα Domain Architecture That Catalyzes a Unique Cyclization–Fragmentation Reaction Sequence[J]. Biochemistry, 2015, 54(48): 7142-7155.