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Substrate uptake and utilization by a marine ultramicrobacterium

F Schut1, M Jansen, T M Gomes

  • 1Department of Microbiology, University of Groningen, Haren, The Netherlands.

Microbiology (Reading, England)
|February 1, 1995
PubMed
Summary

This study investigated how an ultramicrobacterium utilizes glucose and alanine. The organism efficiently transports and metabolizes both substrates, even simultaneously, demonstrating mixed substrate utilization as a key trait.

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Area of Science:

  • Microbiology
  • Biochemistry
  • Marine Biology

Background:

  • Facultatively oligotrophic ultramicrobacteria play roles in marine ecosystems.
  • Understanding substrate utilization is crucial for microbial ecology.

Purpose of the Study:

  • To characterize glucose and alanine uptake systems in an Alaskan fjord ultramicrobacterium (strain RB2256).
  • To investigate substrate kinetics and utilization patterns under various growth conditions.

Main Methods:

  • Batch and chemostat cultures were used to grow strain RB2256.
  • Uptake kinetics and substrate specificity were analyzed for glucose and alanine.
  • Metabolic pathways were examined during single- and dual-substrate limitation.

Main Results:

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  • Glucose uptake was inducible, narrow in specificity, and osmotic-shock-sensitive, with half-saturation constants of 7–74 µM.
  • Alanine uptake was constitutive, binding-protein-dependent, and broad in specificity, with half-saturation constants of 1.3–1.8 µM.
  • Simultaneous glucose and alanine utilization occurred, but alanine transport affinity decreased significantly in the presence of glucose.

Conclusions:

  • Strain RB2256 exhibits distinct uptake mechanisms for glucose and alanine.
  • Mixed substrate utilization is an inherent characteristic of this ultramicrobacterium, enabling adaptation to fluctuating nutrient availability.