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Deep Sea Microbial Ecology01:18

Deep Sea Microbial Ecology

The deep ocean and its underlying sediments represent vast, largely unexplored microbial habitats that extend far beyond the sunlit photic zone. The photic (euphotic) zone typically spans the upper ~100–200 meters of pelagic waters in the open ocean, but its depth varies geographically and seasonally, where sufficient light supports photosynthetic life. Below this lies the deep sea, spanning roughly 1000–6000 meters (bathypelagic to abyssal zones), with deeper hadal trenches extending beyond...

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A novel enzyme, lambda-carrageenase, isolated from a deep-sea bacterium.

Yukari Ohta1, Yuji Hatada

  • 1Japan Agency for Marine-Earth Science and Technology, 2-15 Natsushima, Yokosuka. ohtay@jamstec.go.jp

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|August 24, 2006
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Researchers isolated a novel Pseudoalteromonas bacterium, strain CL19, from deep-sea sediment capable of degrading lambda-carrageenan. This study reports the first isolation and gene sequencing of a lambda-carrageenase enzyme from this bacterium.

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Area of Science:

  • Marine microbiology
  • Enzymology
  • Biotechnology

Background:

  • Marine bacteria play crucial roles in biogeochemical cycles.
  • Carrageenan, a polysaccharide from red algae, is widely used in food and pharmaceutical industries.
  • Degradation of carrageenan by microbial enzymes offers sustainable processing alternatives.

Purpose of the Study:

  • To isolate and characterize a novel lambda-carrageenan-degrading bacterium from deep-sea environments.
  • To purify and analyze the enzymatic properties of the lambda-carrageenase.
  • To determine the gene sequence encoding the lambda-carrageenase.

Main Methods:

  • Isolation of bacteria from deep-sea sediment samples.
  • Purification of lambda-carrageenase using chromatography techniques.
  • Enzyme activity assays at various pH and temperature conditions.
  • Gene sequencing and analysis of the deduced amino acid sequence.

Main Results:

  • Isolation of Pseudoalteromonas bacterium strain CL19, a novel lambda-carrageenan degrader.
  • Purification of a monomeric lambda-carrageenase (approx. 100 kDa) with optimal activity at pH 7 and 35°C.
  • The enzyme exhibited specific activity of 253 U/mg protein and required monovalent salts.
  • Hydrolysis pattern indicated an endo-type lambda-carrageenase cleaving beta-1,4 linkages, producing a specific tetrasaccharide.
  • The gene cglA encoded a mature protein of 103 kDa, with a unique amino acid sequence.

Conclusions:

  • Pseudoalteromonas strain CL19 produces a novel endo-type lambda-carrageenase with unique characteristics.
  • The enzyme's distinct sequence suggests a new family of carrageenases.
  • This discovery has potential applications in carrageenan processing and biotechnology.