7B. Protein 1: 3D Structural Genomics, Homology, Catalytic and Regulatory Dynamics, Fun...

TL;DR

Protein structure analysis involves predicting protein structure, identifying homologues, and studying ligand binding.

Transcript

The following content is provided by MIT OpenCourseWare under a Creative Commons license. Additional information about our license, and MIT OpenCourseWare in general, is available at MIT.edu. PROFESSOR: OK. Welcome back to the second half. We'll pick up on this somewhat pessimistic note of how one goes from a very accurate sequence to a probably le... Read More

Key Insights

• 👋 Threading is an effective method for predicting protein structures by finding the best position to fit a sequence into a known 3D structure.
• 👾 Structural genomics aims to obtain 3D structures for all proteins to saturate the structure space.
• ☠️ The prediction of transmembrane regions in proteins has a high accuracy rate, but there can be false predictions.
• 🦾 Molecular mechanics is used to model protein dynamics and dock small molecules to proteins.
• 👻 Protein structure analysis allows for the manipulation of ligand-protein interactions, which can be used to target specific proteins in systems biology networks.

Questions & Answers

Q: What is threading in protein structure analysis?

Threading is a method that searches through a database of 3D structures and finds the best position to fit a sequence into a structure, taking into account threading positions with insertions, deletions, and offsets.

Q: How does structural genomics aim to saturate the 3D structure space?

Structural genomics aims to obtain the structures of all proteins by launching projects similar to the Genome Project. The goal is to have a 3D structure for every amino acid sequence within a certain amino acid identity range.

Q: What is the accuracy of predicting transmembrane regions in proteins?

The prediction of transmembrane regions in proteins has an accuracy of greater than 99%, with a tolerable false prediction rate ranging from 17% to 43%.

Q: How is molecular mechanics used in protein structure analysis?

Molecular mechanics is used to model protein dynamics and dock small molecules to proteins. It takes into account energy terms such as bond lengths, bond angles, torsion angles, van der Waals interactions, and electrostatic interactions.

Summary & Key Takeaways

• Protein structure analysis involves finding a homologue, whether distant or close, to determine the accuracy of the predicted structure.

• Threading is a method that searches a database of 3D structures and finds the best position to fit a sequence into a structure.

• Structural genomics aims to saturate the 3D structure space by obtaining the structures of all proteins, especially membrane proteins.

• The prediction of transmembrane regions in proteins has favorable accuracy, with some false predictions expected.

• Molecular mechanics is used to model protein dynamics and dock small molecules to proteins.