Protein Complex Structure
Protein Complex Structure - Related Videos
15:35
Analyzing Large Protein Complexes by Structural Mass Spectrometry
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Cited by 68 •
2010
Mass spectrometry has proven to be a valuable tool for analyzing large protein complexes. This method enables insights into the composition, stoichiometry and overall architecture of multi-subunit assemblies. Here, we describe, step-by-step, how to perform a structural mass spectrometry analysis, and characterize macromolecular structures.
12:05
Production of Disulfide-stabilized Transmembrane Peptide Complexes for Structural Studies
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Cited by 7 •
2013
Biophysical and biochemical studies of interactions among membrane-embedded protein domains face many technical challenges, the first of which is obtaining appropriate study material. This article describes a protocol for producing and purifying disulfide-stabilized transmembrane peptide complexes that are suitable for structural analysis by solution nuclear magnetic resonance (NMR) and other analytical applications.
02:41
Protein Complex Assembly
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2020
Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types. Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes. Many viruses self-assemble into a fully functional unit using the infected host cell to...
01:57
Protein Complexes with Interchangeable Parts
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2020
Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct. The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order to...
14:44
Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR
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Cited by 4 •
2013
The NMR-solution structure of a metallochaperone model peptide with Cu (I) was determined, and a detailed protocol from sample preparation and 1D and 2D data collection to a three-dimensional structure is described.
FAQs
Interacting subunits are positioned by several noncovalent forces working together. Hydrogen bonds and electrostatic forces help create favorable contacts, while hydrophobic contacts and shape complementarity help surfaces fit together. The combined effect stabilizes the assembly without requiring covalent bonds and establishes the precise geometry of interfaces that support recognition or activity.
Interfaces are the contact regions where protein subunits communicate and act together. Their geometry can create binding sites or catalytic interfaces that are not present in isolated subunits. Examining these regions helps explain how assembly changes molecular function and how specific contacts support processes such as signaling, transport, and enzymatic activity.
Shape complementarity allows interacting surfaces to fit together in a selective way. This geometric matching works alongside hydrogen bonds, electrostatic forces, and hydrophobic contacts to position the subunits correctly. As a result, the complex can distinguish compatible partners and form an organized interface suited to binding, signaling, transport, or catalysis.
Researchers determine these structures with X-ray crystallography, cryo-electron microscopy, and nuclear magnetic resonance. Each method provides structural information about how the subunits are arranged and how their interfaces may support function. Using these approaches, investigators can connect molecular architecture with recognition, signaling, transport, and enzymatic activity rather than studying interactions only indirectly.
Structural analysis can show how subunits are positioned, where functional binding sites occur, and how catalytic interfaces are organized. These observations help researchers interpret the molecular basis of recognition, signaling, transport, and enzymatic activity. The resulting architecture therefore links the physical arrangement of proteins to the biological behavior of the assembled complex.
Structural information identifies interaction surfaces that can be measured, modified, or targeted. In disease research, these surfaces help investigators examine how altered molecular interactions may affect complex function. In drug development, the same information can guide attention toward interfaces or binding regions whose modification could influence the activity of a protein assembly.