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Related Concept Videos

Leaky Scanning02:28

Leaky Scanning

During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA.  Marilyn Kozak discovered that the sequence RCCAUGG (where R stands for...
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Transcriptional attenuation occurs when RNA transcription is prematurely terminated due to the formation of a terminator mRNA hairpin structure.  Bacteria use these hairpins to regulate the transcription process and control the synthesis of several amino acids including histidine, lysine, threonine, and phenylalanine. Transcription attenuation takes place in the non-coding regions of mRNA.
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Related Experiment Video

Updated: May 16, 2026

The Multifaceted Benefits of Protein Co-expression in Escherichia coli
12:48

The Multifaceted Benefits of Protein Co-expression in Escherichia coli

Published on: February 5, 2015

Codon optimization increases human kallistatin expression in Escherichia coli.

Zhiyu Dai1, Yifei Chen, Weiwei Qi

  • 1Department of Biochemistry, Zhongshan Medical School, Sun Yat-sen University, Guangzhou, Guangdong Province, China.

Preparative Biochemistry & Biotechnology
|December 11, 2012
PubMed
Summary
This summary is machine-generated.

Codon optimization significantly boosted recombinant kallistatin production in E. coli, doubling the yield of this unique serpin protein. This advance facilitates further research into kallistatin

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Published on: August 3, 2017

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Protein Engineering

Background:

  • Kallistatin, a unique serpin, exhibits vasodilatory, antiangiogenic, anti-inflammatory, and antioxidant properties.
  • Low yield of recombinant kallistatin hinders comprehensive study of its biological roles.

Purpose of the Study:

  • To enhance recombinant kallistatin production using gene codon optimization for E. coli.
  • To facilitate further in vitro and in vivo investigations of kallistatin.

Main Methods:

  • Codon optimization algorithm applied to the kallistatin gene for E. coli expression.
  • Purification of both optimized (opti-kallistatin) and wild-type (wt-kallistatin) proteins using Ni-NTA His-binding resins and FPLC.
  • Confirmation of protein identity and purity via SDS-PAGE, Western blot, and Coomassie blue staining.

Main Results:

  • Codon optimization resulted in a ~2-fold increase in recombinant kallistatin yield (2.09 mg/L vs. 1.05 mg/L).
  • Optimized gene sequence showed altered base composition and GC% content compared to wild-type.
  • Purified proteins confirmed to be kallistatin with high purity.

Conclusions:

  • Codon optimization is an effective strategy for significantly increasing heterologous human protein yields in E. coli.
  • This method enhances the production of kallistatin, enabling broader research into its therapeutic potential.