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Revision as of 09:52, 21 October 2018 by Joel L. Sussman (Talk | contribs)
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As life is more than 2D, Proteopedia helps to bridge the 3D relationships between function & structure of biomacromolecules


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Coronavirus Spike Protein Membrane Fusion

by Eric Martz
SARS-CoV-2 spike protein "spears" the host membrane with a fusion peptide and drags the virus envelope membrane transmembrane domain close to the host membrane, initiating fusion. This moves the virus RNA genome into the host cell, initiating infection.
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Molecular Sculpture

by Eric Martz
A historical review on sculptures and physical models of macromolecules.

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Geobacter pili: surprising function.

Y Gu, V Srikanth, AI Salazar-Morales, R Jain, JP O'Brien, SM Yi, RK Soni, FA Samatey, SE Yalcin, NS Malvankar. Nature 2021 doi: 10.1038/s41586-021-03857-w
Geobacter pili were long thought to be electrically conductive protein nanowires composed of PilA-N. Nanowires are crucial to the energy metabolism of bacteria flourishing in oxygen-deprived environments. To everyone's surprise, in 2019, the long-studied nanowires were found to be linear polymers of multi-heme cytochromes, not pili. The first cryo-EM structure of pili (2021) reveals a filament made of dimers of PilA-N and PilA-C, shown. Electrical conductivity of pili is much lower than that of cytochrome nanowires. Evidence suggests that PilA-NC filaments are periplasmic pseudopili crucial for exporting cytochrome nanowires onto the cell surface, rather than the pili serving as nanowires themselves.

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Introduction to protein structure

This tutorial illustrates some basic properties of protein structure:

  • Levels of protein structure.
  • Ways of representing protein structure.
  • Secondary structures.
  • Motifs in proteins.
  • Domains.
  • Tertiary structure.
  • Quaternary structure.

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