DNA Viruses: Medicine’s Next Breakthrough
- If we crunch the numbers, 8 percent of your genome actually comes from viruses that got stranded ther.
- scientists at the La Jolla Institute for Immunology (LJI) have, for the first time, determined the three-dimensional structure of a protein from a human endogenous retrovirus (HERV), specifically...
- HERVs are remnants of ancient viral infections that have become integrated into the human genome.
“`html
Unlocking the Secrets of Ancient Viruses Within Us: the HERV-K Env Protein Structure
Table of Contents
You are mostly but not entirely human. If we crunch the numbers, 8 percent of your genome actually comes from viruses that got stranded ther. This viral detritus is a souvenir from our evolutionary past, a reminder that viruses have been wiht us from the very beginning.
Key Findings & Importance
scientists at the La Jolla Institute for Immunology (LJI) have, for the first time, determined the three-dimensional structure of a protein from a human endogenous retrovirus (HERV), specifically HERV-K Env. This breakthrough, published in Science Advances, opens new avenues for understanding and possibly treating diseases like autoimmune disorders, cancer, and neurodegenerative diseases.
What are HERVs?
HERVs are remnants of ancient viral infections that have become integrated into the human genome. normally, these viral sequences are “silent,” but they can be reactivated in certain disease states.
Why is this discovery critically important?
- First HERV Protein Structure: This is the first time the structure of a human HERV protein has been solved.
- Novel Therapeutic Targets: HERV-K Env proteins appear on the surface of tumor cells and are linked to autoimmune and neurodegenerative diseases, making them potential targets for new drugs and diagnostics.
- Understanding Disease Mechanisms: Revealing the structure helps scientists understand how these viral proteins contribute to disease progression.
Technical Challenges & Solutions
Determining the structure of HERV-K Env was particularly challenging due to its inherent instability. The protein is prone to changing shape, making it difficult to image. The LJI team overcame this by:
- Stabilizing Mutations: Introducing small changes to the protein sequence to lock it in its pre-fusion state.
- Cryo-Electron Microscopy: Using high-resolution imaging to capture 3D images of the protein at different stages.
- Antibody Anchoring: Identifying and utilizing antibodies to help stabilize different versions of the protein.
The HERV-K Env protein exhibits a unique structure compared to other retroviral envelope proteins, such as those found in HIV and SIV:
| Feature | HERV-K Env | HIV/SIV Env |
|---|---|---|
| Overall Shape | Tall and lean trimer | Shorter, squatter trimer |
| Protein Fold | Unique; unlike any other retrovirus | Similar to other retroviruses |
| Stability | highly unstable; requires stabilization techniques | Relatively more stable |
What’s Next?
The LJI team plans to continue investigating the HERV-K Env protein, focusing on:
- Antibody Interactions: Further characterizing the antibodies that bind