Molecule Tutorials - Herong's Tutorial Examples - v1.26, by Herong Yang
Composed Proteins or Protein Complexes
This section provides a quick introduction of protein complex, which contains multiple protein sequences noncovalently-linked to form a quaternary structure.
When multiple protein sequences are noncovalently-linked to form a quaternary structure, we usually call it a composed protein. But technically, we should call it a protein complex, it is not a single protein. It is a mixture of multiple proteins stabilized by hydrophobic interactions between proteins. This is based the definition a protein is a single protein sequence (a single molecule).
The picture below shows two examples of protein complexes.
The protein complex on the left is a symmetric protein complex which contains 3 identical protein sequences linked together.
The protein complex on the right is an asymmetric protein complex which contains different protein sequences linked together.
Table of Contents
Molecule Names and Identifications
Peptide, Peptide Bond, Amino Acid Residues
Protein Visualization - Ribbon Diagram
►Composed Proteins or Protein Complexes
wwpdb.org - Worldwide PDB (Protein Data Bank)
Nucleobase, Nucleoside, Nucleotide, DNA and RNA
ChEMBL Database - European Molecular Biology Laboratory
PubChem Database - National Library of Medicine
INSDC (International Nucleotide Sequence Database Collaboration)
HGNC (HUGO Gene Nomenclature Committee)