Question

Bacterial glutamate synthetase consists of 12 identical subunits arranged in two stacked rings of six subunits. How would you describe this protein's symmetry?

   Bacterial glutamate synthetase consists of 12 identical subunits arranged in two stacked rings of six subunits. How would you describe this protein's symmetry?

Fundamentals of Biochemistry

Fundamentals of Biochemistry

Donald Voet, Judith… 5th Edition

Chapter 6, Problem 27

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Solved by Expert Shazia Naz

03/23/2021

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These subunits are arranged in two stacked rings, each containing six subunits. Show more…

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Bacterial glutamate synthetase consists of 12 identical subunits arranged in two stacked rings of six subunits. How would you describe this protein's symmetry?

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Key Concepts

Dihedral Symmetry

Dihedral symmetry refers to a type of symmetry where a structure has both a primary rotational axis and additional perpendicular two-fold rotational axes. In proteins, this results in an assembly that appears identical after rotations of certain angles (e.g., 60° rotations about a central axis) and following 180° rotations about axes perpendicular to the primary one. This symmetry is common in proteins that are organized in stacked rings or ring-like arrangements.

Protein Quaternary Structure

Protein quaternary structure describes the arrangement of multiple protein subunits into a larger functional assembly. Symmetric arrangements, such as those with dihedral symmetry, frequently occur in oligomeric proteins and are important for the stability and functional regulation of the complex. The symmetric organization can promote cooperative interactions among the subunits, which is critical for the protein’s overall activity.

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