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1,3-Propanediol dehydrogenase from Klebsiella pneumoniae: decameric quaternary structure and possible subunit

David Marçal1, Ana Toste Rêgo, Maria Arménia Carrondo

  • 1Instituto de Tecnologia Química e Biológica, Universidade Nova de Lisboa, 2781-901 Oeiras, Portugal.

Journal of Bacteriology
|November 18, 2008
PubMed

Insights

Klebsiella pneumoniae utilizes glycerol via 1,3-propanediol dehydrogenase. Researchers determined the enzyme's decameric structure, revealing insights into its catalytic function and stability for potential biotechnology applications.

Area of Science:

  • Biochemistry
  • Structural Biology
  • Microbiology

Background:

  • Klebsiella pneumoniae is a significant nosocomial pathogen.
  • This bacterium possesses metabolic versatility, including glycerol utilization.
  • 1,3-Propanediol dehydrogenase is key to glycerol metabolism in K. pneumoniae.

Purpose of the Study:

  • To determine the crystallographic structure of 1,3-propanediol dehydrogenase from K. pneumoniae.
  • To elucidate the enzyme's quaternary structure and its implications for catalytic activity.
  • To explore potential biotechnology applications of K. pneumoniae's metabolic capabilities.

Main Methods:

  • X-ray crystallography was used to determine the enzyme's structure at 2.7-A resolution.
  • Analysis of the enzyme's monomeric and decameric arrangements.
  • Investigation of ionic interactions stabilizing the enzyme's structure.

Main Results:

  • The crystallographic structure of 1,3-propanediol dehydrogenase was determined.
  • The enzyme forms a stable decameric structure, a pentamer of dimers.
  • Monomeric structure is similar to other alcohol dehydrogenases, with dimers associated by ionic interactions.
  • Kinetic properties suggest cooperativity between monomers in the decameric form.

Conclusions:

  • The decameric structure of 1,3-propanediol dehydrogenase is crucial for its catalytic function and stability.
  • Understanding this structure opens avenues for biotechnological applications of K. pneumoniae.
  • The enzyme's stable packing and potential cooperativity offer insights into its biological role.

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