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Abstract
Shewanellae are well known for their ability to utilize a number of electron acceptors and are therefore considered to have important roles in element cycling in the environment, such as nitrogen cycling through dissimilatory nitrate reduction to ammonia (DNRA) and denitrification. Possessing two periplasmic nitrate reductase systems (NAP-α and NAP-β) is a special trait of the Shewanella genus, and both enzymes are likely to provide selective advantage to the host. This review relates the current knowledge and aspects of the nitrate respiration system of Shewanella. Specifically, the potential physiological functions and regulation mechanisms of the duo-NAP system are discussed in addition to the evolution of anaerobic respiration systems of Shewanella.
Highlights
Shewanella species are widespread in diverse environments and have major environmental relevance (Fredrickson et al, 2008)
Shewanellae are well known for their ability to utilize a number of electron acceptors and are considered to have important roles in element cycling in the environment, such as nitrogen cycling through dissimilatory nitrate reduction to ammonia (DNRA) and denitrification
DENITRIFICATION AND AMMONIFICATION BY THE SHEWANELLA GENUS Denitrification is a respiratory process in which nitrite is first reduced to nitric oxide by nitrite reductase (NIR), nitric oxide reductase (NOR) catalyzes nitric oxide reduction to nitrous oxide, and dinitrogen is synthesized from the reduction of nitrous oxide by nitrous oxide reductase (NOS)
Summary
Reviewed by: Stanley Chun Kwan Lau, The Hong Kong University of Science and Technology, China Matthew James Neave, King Abdullah University of Science and Technology/Woods Hole Oceanographic Institution, Saudi Arabia. Shewanellae are well known for their ability to utilize a number of electron acceptors and are considered to have important roles in element cycling in the environment, such as nitrogen cycling through dissimilatory nitrate reduction to ammonia (DNRA) and denitrification. Possessing two periplasmic nitrate reductase systems (NAP-α and NAPβ) is a special trait of the Shewanella genus, and both enzymes are likely to provide selective advantage to the host. This review relates the current knowledge and aspects of the nitrate respiration system of Shewanella.
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