Related Experiment Video
Updated: Jul 13, 2026
10:00
Gradient Echo Quantum Memory in Warm Atomic Vapor
Published on: November 11, 2013
Self-assembled heterotrimeric collagen triple helices directed through electrostatic interactions.
Varun Gauba1, Jeffrey D Hartgerink
1Department of Chemistry, Rice University, 6100 Main Street, Mail Stop 60, Houston, TX 77005, USA.
Journal of the American Chemical Society
|February 14, 2007
Summary
Researchers explored collagen-like heterotrimers, finding that electrostatic interactions guide peptide assembly. This approach enhances triple helix stability and allows for greater collagen diversity.
Area of Science:
- Biochemistry
- Structural Biology
- Materials Science
Background:
- Collagen is a vital fibrous protein and a primary structural component in connective tissues.
- Type I collagen, the most prevalent form, is a heterotrimer composed of two alpha1 chains and one alpha2 chain.
- Current synthetic methods primarily focus on homotrimeric triple helices, limiting exploration of heterotrimeric structures.
Purpose of the Study:
- To investigate the stability of heterotrimeric collagen-like triple helices.
- To examine the role of electrostatic interactions in directing heterotrimer formation.
- To explore methods for enhancing the stability and diversity of collagen triple helices.
Main Methods:
- Synthesis of seven 30-amino acid peptides with varying net charges (-10 to +10).
- Assessment of heterotrimer assembly through peptide mixing.
- Analysis of triple helical stability influenced by intermolecular electrostatic interactions.
Main Results:
- Successful assembly of five distinct AAB heterotrimers and one ABC heterotrimer.
- Demonstration that intermolecular electrostatic interactions can direct heterotrimer formation.
- Evidence that unstable amino acids can be stabilized within heterotrimers by stable partners.
Conclusions:
- Electrostatic interactions are a viable strategy for controlling heterotrimeric collagen assembly.
- Heterotrimer formation offers a mechanism to improve the stability of collagen triple helices.
- This approach expands the chemical diversity achievable in synthetic collagen structures.
Related Concept Videos
01:09Torsional Pendulum
A torsional pendulum involves the oscillation of a rigid body in which the restoring force is provided by the torsion in the string from which the rigid body is suspended. Ideally, the string should be massless; practically, its mass is much smaller than the rigid body's mass and is neglected.
As long as the rigid body's angular displacement is small, its oscillation can be modeled as a linear angular oscillation. The amplitude of the oscillation is an angle. The role of mass is played by the...
As long as the rigid body's angular displacement is small, its oscillation can be modeled as a linear angular oscillation. The amplitude of the oscillation is an angle. The role of mass is played by the...
01:22Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)
Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...
01:30Three-Dimensional Force System
In mechanical engineering, a three-dimensional force system is a system of forces acting in three dimensions, with forces applied along the x, y, and z coordinate axes. The three-dimensional force system is an important concept in mechanical engineering, as it allows engineers to understand and analyze the behavior of objects and structures in three dimensions. By understanding the forces acting on a system, engineers can design more efficient and effective mechanical systems that can withstand...
01:27Three Force Member
A rigid body subjected to three forces acting at three points is known as a three-force member. These forces must have concurrent lines of action, except for parallel forces, where the lines of action are parallel.
For example, consider a dumpster connected to a pin support at point A and a pin attached to a hydraulic cylinder at point B.
For example, consider a dumpster connected to a pin support at point A and a pin attached to a hydraulic cylinder at point B.
01:13Angle of Twist: Problem Solving
An electric motor applies a torque of 700 N·m to an aluminum shaft, triggering a stable rotation. Two pulleys, B and C, are subjected to torques of 300 N·m and 400 N·m, respectively. The modulus of rigidity is provided as 25 GPa. With the knowledge of the length and diameter of each segment, the twist angle between the two pulleys can be computed. First, a section cut is made between pulleys B and C, and the cut cross-section is analyzed using a free-body diagram. Given that the torque exerted...
01:19Three-Winding Transformers
Three identical single-phase transformers can be configured to form a three-phase transformer connection, which involves high-voltage and low-voltage windings. The high-voltage windings are denoted by capital letters A-B-C, while the low-voltage windings are labeled with lowercase letters a-b-c, representing their respective phases. This notation helps distinguish between the high and low voltage sides of the transformer.
In the per-unit equivalent circuit of a grounded Y-Y three-phase...
In the per-unit equivalent circuit of a grounded Y-Y three-phase...