[跳轉至內容](https://www.sigmaaldrich.com#main-content)
[](https://www.sigmaaldrich.com/TW/zh)
產品
購物車0
TWZH
產品
產品應用服務資源支援
[登入 / 註冊](https://www.sigmaaldrich.com/oidc-sign-in)
[訂單查詢](https://www.sigmaaldrich.com/TW/zh/order-lookup)
[快速下訂](https://www.sigmaaldrich.com/TW/zh/quick-order)
購物車0
[Home](https://www.sigmaaldrich.com/TW/en)[Cloning & Expression](https://www.sigmaaldrich.com/TW/en/applications/genomics/cloning-and-expression)pGEX Vectors
# pGEX Vectors
GST-tagged proteins are constructed by inserting a gene or gene fragment into the MCS of one of the 13 pGEX vectors. Expression is under the control of the tac promoter, which is induced by the lactose analog isopropyl β-D-thiogalactoside (IPTG). All pGEX vectors are also engineered with an internal lacIq gene. The lacIq gene product is a repressor protein that binds to the operator region of the tac promoter, preventing expression until induction by IPTG, thus maintaining tight control over expression of the insert.
Nine of the vectors have an expanded MCS that contains six restriction sites. The expanded MCS facilitates the unidirectional cloning of cDNA inserts obtained from libraries constructed using many available lambda vectors. pGEX-6P-1, pGEX-6P-2, and pGEX-6P-3 each encode the recognition sequence for site-specific cleavage by PreScission Protease between the GST domain and the MCS. pGEX-4T-1, pGEX-4T-2, and pGEX-4T-3 are derived from pGEX-2T and contain a thrombin recognition site. pGEX-5X-1, pGEX-5X-2, and pGEX-5X-3 are derivatives of pGEX-3X and possess a Factor Xa recognition site (__Table 1.1__).
| | |
|----------------------------------------------------------------------|----------------------|
| Vector | Cleaved by |
| pGEX-6P-1, pGEX-6P-2, pGEX-6P-3 | PreScission Protease |
| pGEX-4T-1, pGEX-4T-2, pGEX-4T-3, pGEX-1λT, pGEX-2T | Thrombin |
| pGEX-5X-1, pGEX-5X-2, pGEX-5X-3, pGEX-3X | Factor Xa |
| pGEX-2TK | Thrombin |
| Allows detection of expressed proteins by direct labeling *in vitro* | |
Table 1.1. Protease cleavage sites of pGEX vectors
pGEX-2TK has a different MCS from that of the other vectors. pGEX-2TK is designed to allow the detection of expressed proteins by directly labeling the tagged products in vitro. This vector contains the recognition sequence for the catalytic subunit of cAMP-dependent protein kinase obtained from heart muscle. The protein kinase site is located between the thrombin recognition site and the MCS. Expressed proteins can be directly labeled using protein kinase and \[γ–32P]ATP and readily detected using standard radiometric or autoradiographic techniques. pGEX-2TK is a derivative of pGEX-2T, and its tagged protein can be cleaved with thrombin.
Collectively, the pGEX vectors provide all three translational reading frames beginning with the EcoRI restriction site (__Figure 1.1__). pGEX-1λT, pGEX-6P-1, pGEX-4T-1, and pGEX-5X-1 can directly accept and express cDNA inserts isolated from λgt11 libraries.
Refer to Appendix 2 ([*Control regions for pGEX vectors*](https://www.sigmaaldrich.com/TW/en/technical-documents/protocol/genomics/cloning-and-expression/pgex-vectors)) for a listing of the control regions of the pGEX vectors. Complete DNA sequences and restriction site data are available from GenBank™. GenBank accession numbers are listed in Appendix 2 ([*Control regions for pGEX vectors*](https://www.sigmaaldrich.com/TW/en/technical-documents/protocol/genomics/cloning-and-expression/pgex-vectors)).
__Figure 1.1.__Map of the GST vectors showing the reading frames and main features. All 13 vectors have stop codons in all three reading frames downstream from the MCS (not depicted in this map). See Appendix 2 ([Control regions for pGEX vectors](https://www.sigmaaldrich.com/TW/en/technical-documents/protocol/genomics/cloning-and-expression/pgex-vectors)) for the control regions of the 13 vectors.
Select the proper vector to match the reading frame of the cloned insert.
Consider which protease and conditions for cleavage are most suitable for your target protein preparation.
pGEX-6P PreScission Protease vectors offer the most efficient method for cleavage and purification of GST-tagged proteins. Site-specific cleavage is performed with simultaneous immobilization of the protease on the column. The protease has high activity at low temperature so that all steps can be performed in the cold room to protect the integrity of the target protein. Cleavage enzyme and GST tag are removed in a single step.
## Materials
抱歉，發生意外錯誤。
Response not successful: Received status code 500
__Related Articles__
- [Introduction to Cell Transfection](https://www.sigmaaldrich.com/TW/en/technical-documents/technical-article/cell-culture-and-cell-culture-analysis/transfection-and-gene-editing/transfection-reagents)
- [Reverse Transfection of Plasmid DNA](https://www.sigmaaldrich.com/TW/en/technical-documents/technical-article/cell-culture-and-cell-culture-analysis/transfection-and-gene-editing/xtg-reverse-transfect-pdna)
- [3xFLAG® System Expression Vectors for Ultra-Sens](https://www.sigmaaldrich.com/TW/en/technical-documents/technical-article/genomics/cloning-and-expression/3x-flag)
- [Blue-White Screening & Protocols for Colony Selection](https://www.sigmaaldrich.com/TW/en/technical-documents/technical-article/genomics/cloning-and-expression/blue-white-screening)
- [Bacterial Transformation Protocols](https://www.sigmaaldrich.com/TW/en/technical-documents/technical-article/genomics/cloning-and-expression/competent-cells)
- [Genotypes, Phenotypes and Markers](https://www.sigmaaldrich.com/TW/en/technical-documents/technical-article/genomics/cloning-and-expression/definitions-and-genotypes-of-e-coli)
- [Restriction Enzyme Cloning Glossary](https://www.sigmaaldrich.com/TW/en/technical-documents/technical-article/genomics/cloning-and-expression/estriction-enzyme-cloning-manual-glossary)
- [How Transfection Works](https://www.sigmaaldrich.com/TW/en/technical-documents/technical-article/genomics/cloning-and-expression/how-transfection-works)
頂部
__登入以繼續__
若要繼續閱讀，請登入或建立帳戶。
登入__還沒有帳戶？__註冊
支援[客戶支援](https://www.sigmaaldrich.com/TW/zh/support/customer-support)[聯絡我們](https://www.sigmaaldrich.com/TW/zh/collections/offices)[常見問題](https://maestro.my.site.com/knowledgeportal/s/)[安全資料表 (SDS)](https://www.sigmaaldrich.com/TW/zh/documents-search?tab=sds)[證書 (COA/COO)](https://www.sigmaaldrich.com/TW/zh/documents-search?tab=coa)[品質與法規](https://www.sigmaaldrich.com/TW/zh/life-science/quality-and-regulatory-management)[計算機與應用程式](https://www.sigmaaldrich.com/TW/zh/support/calculators-and-apps)[網路研討會](https://www.sigmaaldrich.com/TW/zh/collections/webinars)
訂單[訂單查詢](https://www.sigmaaldrich.com/TW/zh/order-lookup)[快速訂購](https://www.sigmaaldrich.com/TW/zh/quick-order)[客製化產品](https://www.sigmaaldrich.com/TW/zh/services/custom-products)[電子商務解決方案](https://www.sigmaaldrich.com/TW/zh/life-science/ecommerce/ecommerce-solutions)
公司簡介[關於我們](https://www.sigmaaldrich.com/TW/zh/life-science/about-us)[責任](https://www.sigmaaldrich.com/TW/zh/life-science/ssbi)[活動](https://www.sigmaaldrich.com/TW/zh/collections/events)[新聞稿](https://www.sigmaaldrich.com/TW/zh/collections/press)[節目](https://www.sigmaaldrich.com/TW/zh/life-science/partnership-programs)[工作機會](https://careers.merckgroup.com/global/en)[辦公室](https://www.sigmaaldrich.com/TW/zh/collections/offices)
社交媒體
[](https://www.linkedin.com/company/merck-life-science)
[](https://x.com/Merck_lifesci)
[](https://www.facebook.com/Merck.lifescience)
[](https://www.instagram.com/mercklifescience/)
[](https://www.youtube.com/@MerckLifeScience/featured)
Merck
__Research.開發。生產。__
我們是全球生命科學產業的領導供應商，提供研究、生物技術開發與生產，以及藥物治療開發與生產的解決方案與服務。
[](https://www.sigmaaldrich.com/TW/zh)
[Sigma-Aldrich® 溶液](https://www.sigmaaldrich.com/TW/zh/life-science/sigma-aldrich)[BioReliance® 解決方案](https://www.sigmaaldrich.com/TW/zh/life-science/bioreliance)[Millipore® 溶液](https://www.sigmaaldrich.com/TW/zh/life-science/millipore)[SAFC® 解決方案](https://www.sigmaaldrich.com/TW/zh/life-science/safc)[Milli-Q® 解決方案](https://www.sigmaaldrich.com/TW/zh/life-science/milliq)[Supelco® 解決方案](https://www.sigmaaldrich.com/TW/zh/life-science/supelco)
© 2026 Merck KGaA, Darmstadt, Germany 和/或其附屬公司。版權所有，包括用於 AI 訓練的文字和資料挖掘以及類似技術。
未經許可，嚴禁複製本網站的任何資料。
[網站使用條款](https://www.sigmaaldrich.com/TW/zh/life-science/legal/site-use-terms)|[隱私權政策](https://www.sigmaaldrich.com/TW/zh/life-science/legal/privacy-statement)|[一般銷售條款](https://www.sigmaaldrich.com/TW/zh/life-science/legal/terms-and-conditions)|[版權同意書](https://www.sigmaaldrich.com/TW/zh/life-science/legal/copyright-consent)|[網站地圖](https://www.sigmaaldrich.com/TW/zh/site-map)
An unknown error has occured.