by Ciro Santilli (@cirosantilli, 35)
A protein that is a catalyst for some chemical reaction.
For an initial concrete example, consider e. Coli K-12 MG1655 gene thrA.
Video 1.
How Enzymes Work by RCSBProteinDataBank (2017)
Source. Shows in detail how aconitase catalyses the citrate to isocitrate reaction in the citric acid cycle.

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From the Wikipedia image we can see clearly the polymer structure formed: it is a mesh with:
Figure 1.
Peptidoglycan polymer structure
. Source.

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Video 1.
A Day in the Life of a Motor Protein by Hoogenraad Lab
. Source.
Family of proteins that walks on actin microfilaments.
Responsible for muscle contraction.
There are two families:
  • kinesin moves in one direction
  • dynein moves in the other direction
Video 1.
Kinesin protein walking on microtubule by XVIVO
. Source. Clip from Video "The Inner Life of the Cell by XVIVO Scientific Animation (2011)" with captions added in.
Video 2.
Kinesin Motor Protein 3D Animation by Art of the cell
. Source.

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