Bacterial hydrolysis of protein and methylated proteins and its implicationsfor studies of protein degradation in aquatic systems

Article Abstract:

The utilization of two forms of radiolabelled proteins by marine bacteria was investigated and compared using tracer studies. Ribulose 1,5-biphosphate carboxylases were labelled using in vitro translation and reductive methylation methods and theirbacterial degradation was analyzed. Results show that bacteria hydrolyzed both proteins at approximately equal rates. However, less methylated proteins were assimilated into cells compared to uniformly labelled proteins.

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Chitin degradation proteins produced by the marine bacterium Vibrio harveyi growing on different forms of chitin

Article Abstract:

The marine bacterium Vibrio harveyi, on exposure to different forms of chitin, generate chitin degrading proteins, indicating the presence of a complex system of enzymes and substrate-binding proteins. The chitinase genes are unique in terms of DNA restriction patterns and immunological and enzymatic properties. Bacteria, grown on beta-chitin have higher growth rate and more chitinase activity than those grown on alpha-chitin.

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High abundances of aerobic anoxygenic photosynthetic bacteria in the South Pacific Ocean

Article Abstract:

The abundance of aerobic anoxygenic phototrophic (AAP) bacteria across the South Pacific Ocean is examined. Results suggest that AAP bacteria are abundantly found in various oligotrophic conditions and also account for a large part of the bacterioplanktonic carbon stock.

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