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Structure, function, and mechanism of proline utilization A (PutA).

Li-Kai Liu1, Donald F Becker2, John J Tanner3

  • 1Department of Biochemistry, University of Missouri, Columbia, MO, 65211, United States.

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|July 18, 2017
PubMed
Summary
This summary is machine-generated.

The bacterial PutA enzyme uniquely combines proline oxidation and DNA binding. This flavoenzyme

Keywords:
Aldehyde dehydrogenaseEnzyme hysteresisFlavin-dependent reactionFlavoproteinMultifunctional enzymesProtein structureSubstrate channelingproline catabolism

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Enzymology

Background:

  • Proline is vital for cellular processes, including stress response and energy production.
  • The proline catabolic pathway converts proline to glutamate, providing essential nutrients.
  • Defects in proline metabolism are linked to human disorders like schizophrenia and pathogen virulence.

Purpose of the Study:

  • To review the unique attributes of the bacterial proline utilization A (PutA) enzyme.
  • To highlight PutA's bifunctional nature and its role in proline catabolism.
  • To explore PutA's flavoenzyme characteristics, including its structure, function, and regulation.

Main Methods:

  • Literature review of existing research on PutA.
  • Analysis of PutA's structural and functional properties.
  • Examination of PutA's role in proline metabolism and gene regulation.

Main Results:

  • PutA is a large, bifunctional enzyme combining proline dehydrogenase (PRODH) and glutamate semialdehyde dehydrogenase (GSALDH) activities.
  • PutA exhibits diverse oligomeric states and quaternary structures.
  • PutA possesses DNA-binding activity, acting as a transcriptional repressor.
  • Flavin redox state influences PutA's subcellular location and function, enabling "functional switching".

Conclusions:

  • PutA is a remarkable flavoenzyme with multifaceted roles in bacteria.
  • Its unique structure and regulatory mechanisms allow for efficient proline utilization and gene control.
  • Understanding PutA offers insights into bacterial metabolism, virulence, and potential therapeutic targets.