by

Ciro Santilli (@cirosantilli, 35)

Type of protein

Enzyme

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A protein that is a catalyst for some chemical reaction.

For an initial concrete example, consider e. Coli K-12 MG1655 gene thrA.

How Enzymes Work by RCSBProteinDataBank (2017)

Source. Shows in detail how aconitase catalyses the citrate to isocitrate reaction in the citric acid cycle.

Active site

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Cofactor (biochemistry)

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NADP+

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DNA polymerase

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Terminal deoxynucleotidyl transferase (TdT)

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Enzyme inhibitor

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Protease

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Restriction enzyme

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Glycoprotein

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Peptidoglycan

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Forms the bacterial cell wall.

From the Wikipedia image we can see clearly the polymer structure formed: it is a mesh with:

sugar covalent bond chains in one direction. These have two types of monosaccharide, NAM and NAG
peptide chains on the other, and only coming off from NAM

Figure 1.
Peptidoglycan polymer structure
. Source.

Polyprotein

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Receptor (biochemistry)

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Transmembrane protein

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Transmembrane domain

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Motor protein

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A Day in the Life of a Motor Protein by Hoogenraad Lab

Myosin

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Family of proteins that walks on actin microfilaments.

Responsible for muscle contraction.

Microtubule motors

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There are two families:

kinesin moves in one direction
dynein moves in the other direction

Kinesin

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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.

Kinesin Motor Protein 3D Animation by Art of the cell

Dynein

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 Ancestors (7)

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