Quaternary Structure

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7 Terms

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Quaternary Structure

Protein–Protein Interactions; same interactions that stabilize tertiary structure, but between multiple protein subunits

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Why Quaternary Structures?

  • New structural properties (especially fibrous proteins)

  • Improved regulation (allostery)

  • Link functions in close proximity (multi-enzyme complex)

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Symmetries of quaternary structures

Although composed of asymmetric polypeptides, proteins adopt many symmetrical patterns

ex. Helical Symmetry (Tobacco mosaic virus: protein subunits form a helical array about a helically coiled RNA)

<p>Although composed of asymmetric polypeptides, proteins adopt many symmetrical patterns</p><p>ex.&nbsp;Helical Symmetry (Tobacco mosaic virus: protein subunits form a helical array about a helically coiled RNA)</p>
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Protein protein interactions

Bovine Pancreatic Trypsin Inhibitor with trypsin

<p>Bovine Pancreatic Trypsin Inhibitor with trypsin</p>
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Hetero-oligomers

different proteins come together

G-protein complex: Heterotrimeric

haemoglobin: heterotetrameric note symmetry

<p>different proteins come together</p><p>G-protein complex: Heterotrimeric</p><p>haemoglobin: heterotetrameric note symmetry</p>
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Homo-oligomers

same proteins come together

DNA packaging motor - homodecamer

<p>same proteins come together</p><p>DNA packaging motor - homodecamer</p>
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Virus Capsids

very intricate quaternary structures

<p>very intricate quaternary structures</p>