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Related Concept Videos

Inorganic Nitrogen Assimilation01:22

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Nitrogen is an essential element in biological systems, forming a crucial component of proteins, nucleic acids, and other cellular constituents. Many bacteria and archaea acquire nitrogen in the form of nitrate (NO₃⁻) or ammonia (NH₃), which are then assimilated into biomolecules through specific enzymatic pathways.Assimilatory Nitrate ReductionWhen nitrate enters the cell, it undergoes a two-step reduction process known as assimilatory nitrate reduction. Initially, the enzyme...
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Chemolithotrophs are microorganisms that obtain energy by oxidizing inorganic molecules such as hydrogen gas (H₂), ammonia (NH₃), reduced sulfur compounds (H₂S, S²⁻), and ferrous iron (Fe²⁺). Unlike heterotrophic organisms that rely on organic carbon, chemolithotrophs transfer electrons from these inorganic donors to the electron transport chain (ETC), generating a proton motive force (PMF) that drives ATP synthesis through oxidative phosphorylation.
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Nitrogen is a very important element for life because it is a major constituent of proteins and nucleic acids. It is a macronutrient, and in nature, it is recycled from organic compounds and stored in the form of  ammonia, ammonium ions, nitrate, nitrite, or  nitrogen gas by many metabolic processes. Many of these metabolic processes are carried out only by prokaryotes.
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Red algae, also known as rhodophytes, are primarily found in marine environments, though some species inhabit freshwater and terrestrial ecosystems. These organisms exist in both unicellular and multicellular forms, with some multicellular varieties reaching macroscopic sizes.As phototrophic organisms, red algae contain chlorophyll a; however, their chloroplasts lack chlorophyll b. Instead, they possess phycobiliproteins, which serve as major light-harvesting pigments, similar to those found in...
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Quantification of Heavy Metals and Other Inorganic Contaminants on the Productivity of Microalgae
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Understanding nitrate assimilation and its regulation in microalgae.

Emanuel Sanz-Luque1, Alejandro Chamizo-Ampudia1, Angel Llamas1

  • 1Department of Biochemistry and Molecular Biology, University of Cordoba Cordoba, Spain.

Frontiers in Plant Science
|November 19, 2015
PubMed
Summary

Nitrate assimilation in algae, particularly Chlamydomonas reinhardtii, is crucial for nitrogen acquisition. Recent findings highlight nitric oxide (NO) as a key signaling molecule regulating this vital process.

Keywords:
Chlamydomonasgreen algaenitrate assimilationnitrate/nitrite uptakenitric oxidenitrogen metabolism

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Area of Science:

  • Plant and Algal Physiology
  • Molecular Biology
  • Biochemistry

Background:

  • Nitrate assimilation is essential for nitrogen acquisition in green microalgae.
  • Chlamydomonas reinhardtii serves as a model organism, offering insights applicable to agriculture.
  • Understanding nitrate assimilation regulation is key for optimizing N uptake.

Purpose of the Study:

  • To review recent findings on nitrate transport, reduction, and regulation in algae.
  • To highlight the role of nitric oxide (NO) in regulating nitrate assimilation.
  • To critically examine regulatory mechanisms and Molybdenum cofactor synthesis.

Main Methods:

  • Literature review of recent studies on nitrate assimilation in various algae.
  • Analysis of data on nitrate transport and reduction mechanisms.
  • Examination of regulatory pathways and signaling molecules.

Main Results:

  • Nitrate assimilation is a critical N acquisition pathway in green algae.
  • Nitric oxide (NO) acts as a significant signal molecule in regulating nitrate assimilation.
  • Regulatory genes and proteins control the nitrate assimilation pathway, including Molybdenum cofactor synthesis.

Conclusions:

  • Nitrate assimilation is a complex, regulated process in algae with implications for plant agriculture.
  • Nitric oxide (NO) plays a pivotal role in both transcriptional and posttranslational regulation.
  • Further research into regulatory mechanisms and cofactor synthesis is essential.