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Conserved Binding Sites01:49

Conserved Binding Sites

Many proteins’ biological role depends on their interactions with their ligands, small molecules that bind to specific locations on the protein known as ligand-binding sites. Ligand-binding sites are often conserved among homologous proteins as these sites are critical for protein function.
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Protein Organization01:24

Protein Organization

Proteins are polymers of amino acid residues. They are versatile and responsible for different cellular functions, including DNA replication, molecular transport, catalysis, and structural support. Proteins have a hierarchical structure comprising at least three levels of organization: primary, secondary, and tertiary structure. Some large proteins have a quaternary structure where individual protein subunits are linked together.
The primary structure of a protein is its amino acid sequence.

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Unique structural features and sequence motifs of proline utilization A (PutA).

Ranjan K Singh1, John J Tanner

  • 1Departments of Chemistry and Biochemistry, University of Missouri-Columbia, Columbia, MO 65211, USA.

Frontiers in Bioscience (Landmark Edition)
|December 29, 2011
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Summary

Proline utilization A proteins (PutAs) are bifunctional enzymes. Structural analysis reveals unique features in PutAs, including a conserved motif that seals the internal substrate-channeling cavity.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Enzymology

Background:

  • Proline utilization A proteins (PutAs) are bifunctional enzymes catalyzing proline oxidation to glutamate.
  • They possess distinct proline dehydrogenase and pyrroline-5-carboxylate dehydrogenase active sites.

Purpose of the Study:

  • To identify unique structural features of PutAs using the crystal structure of Bradyrhizobium japonicum PutA (BjPutA).
  • To analyze sequence data for conserved elements and domains absent in related monofunctional enzymes.

Main Methods:

  • X-ray crystallography of BjPutA.
  • Sequence analysis and multiple sequence alignment.
  • Remote homology detection.

Main Results:

  • PutAs exhibit unique secondary structural elements and domains compared to monofunctional enzymes.
  • A conserved 17-residue C-terminal motif in some PutAs seals the internal substrate-channeling cavity.
  • A 100-200 residue C-terminal domain of unknown function, homologous to oligomerization and Rossmann fold domains, is present in some PutAs but not minimalist variants.

Conclusions:

  • Unique structural features in PutAs, such as the C-terminal motif, are crucial for function, potentially aiding substrate channeling.
  • The identified C-terminal domain suggests potential roles in oligomerization or other functions in specific PutA variants.