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Signal sequence trap to clone cDNAs encoding secreted or membrane-associated plant proteins
P Kristoffersen1, T Teichmann, R Stracke
1Max-Delbrück-Laboratorium, Max-Planck-Gesellschaft, Köln, Germany.
Analytical Biochemistry
|December 1, 1996
Summary
Researchers developed a rapid cloning method for plant cDNAs encoding membrane proteins. This technique uses a novel expression vector and a color-based screen for efficient isolation of target cDNAs.
Area of Science:
- Molecular Biology
- Plant Science
- Cell Biology
Background:
- Cloning plant cDNAs encoding membrane proteins is challenging.
- Existing methods are often time-consuming and inefficient.
Purpose of the Study:
- To develop a rapid and efficient method for cloning plant cDNAs encoding proteins with membrane-spanning domains.
- To create a novel expression vector for expressing plant cDNA libraries in COS cells.
Main Methods:
- Construction of a novel expression vector for COS cell expression.
- Expression of fusion proteins with an N-terminal endoplasmic reticulum (ER) signal peptide.
- Utilizing a color-based immunoscreening procedure for cDNA isolation.
Main Results:
- Isolation of several cDNA clones encoding proteins with putative membrane-spanning domains.
- Successful expression and trafficking of fusion proteins to the plasma membrane.
- Identification of cytochrome b5 and full-length cDNA clones for ER membrane-targeted proteins.
Conclusions:
- The developed method enables rapid cloning of plant cDNAs for membrane proteins.
- The novel vector facilitates efficient expression and screening in COS cells.
- This approach is valuable for studying membrane proteins and secretory pathways in plants.