Evolution of Life on Earth: A story of an expanding protein universe | Dmitry Korkin and Lex Fridman

TL;DR

Proteins have evolved from a common ancestor, with protein domains and linkers playing crucial roles in their structure and function. Alternative splicing adds another layer of complexity to protein evolution.

Transcript

since we're talking about the evolutionary history of a virus uh let's zoom back out and uh look at the evolution of proteins i i glanced at this 2010 nature paper on the quote ongoing expansion of the protein universe and then you know it kind of implies and uh talks about that uh protein started with a common ancestor which is you know kind of in... Read More

Key Insights

• 🙈 Proteins have evolved from a common ancestor over billions of years, resulting in the vast diversity of proteins seen today.
• 🧑‍🏭 Protein domains act as functional and evolutionary building blocks, contributing to the stability and diversity of proteins.
• 🖐️ Linkers, flexible regions in proteins, facilitate interactions between protein domains and play a role in spatial reorganization.
• 👻 Alternative splicing allows a single gene to generate multiple protein variants, adding complexity and diversity to protein evolution.
• ❓ The interplay between alternative splicing and protein domains influences the structure and function of proteins.
• 🪡 Protein evolution is driven by the need to maintain essential functions while diversifying to adapt to changing environments.
• 🏑 Understanding the evolution of proteins can provide insights into their structure, function, and potential applications in various fields.

Questions & Answers

Q: What is the significance of protein domains in protein evolution?

Protein domains are not only functional building blocks, but also evolutionary building blocks. By remaining structurally and functionally stable, they contribute to protein diversity while maintaining essential functions.

Q: How do linker regions in proteins contribute to their function?

Linker regions connect protein domains and can be short or long. Short linkers force domains to be close together, while long linkers provide flexibility for spatial reorganization. They also play a role in protein-protein interactions.

Q: What is alternative splicing and how does it affect protein evolution?

Alternative splicing allows a single gene to produce multiple protein products by selectively including or excluding exons. This random process adds complexity to protein evolution and is influenced by disease or developmental stages.

Q: How does alternative splicing relate to protein domains?

The boundaries of exons involved in alternative splicing often coincide with the boundaries of protein domains. This interplay between gene-level events and protein evolution adds to the complexity and diversity of proteins.

Summary & Key Takeaways

• Proteins have evolved over 3.5 billion years from a common ancestor, resulting in millions of proteins today.

• Protein domains are hierarchical building blocks that contribute to the structure and function of proteins.

• Linkers, flexible parts of proteins, facilitate interactions between protein domains.

• Alternative splicing allows a single gene to produce multiple functionally active protein products, adding another level of complexity to protein evolution.