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The highly challenging octameric, cone-shaped transmembrane protein MspA has been successfully expressed on a periplasmic cell-free platform.
Release date:
2025-04-03
A team from Nanjing University of Aeronautics and Astronautics, using a self‑constructed Perlin‑type cell‑free protein expression platform, successfully achieved the efficient in vitro synthesis of the mycobacterial porin MspA and confirmed that its octameric conical pore structure exhibits high structural integrity and closely resembles its native conformation.
*Breaking through technical barriers and overcoming the challenges of transmembrane protein expression:
As a prototypical octameric transmembrane channel protein, MspA can maintain high levels of expression and channel activity even when subjected to numerous amino acid substitutions, making it an ideal candidate for engineering via site-directed mutagenesis. Its distinctive conical pore architecture also holds significant potential for applications in materials science and chemistry. Traditional cellular expression systems often encounter challenges such as low expression efficiency and misfolding due to the hydrophobic nature of transmembrane proteins and the complex self-assembly of multi‑subunit structures; in contrast, Perotin’s proprietary cell-free platform has successfully enabled the efficient expression of the MspA octameric transmembrane protein.
*Structural precision has been rigorously validated by authoritative sources:
The technical team performed structural analysis on the in vitro–expressed protein, and the results showed that the MspA protein expressed in vitro exhibits a canonical octameric symmetry, with domain architecture closely matching that of the native protein and key functional sites fully consistent with previous reports.
*Platform technologies empower innovation in synthetic biology:
The groundbreaking advances in the Perotin cell-free protein expression platform have not only enabled transmembrane… Channel protein “Difficult-to-express” membrane proteins, such as ion transporters, have been efficiently prepared, demonstrating significant application potential in areas like the custom design of synthetic biological components and the engineering of artificial organelles.
Source: Nanjing University of Aeronautics and Astronautics team
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