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Preparation of Nitriles01:12

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One of the common methods to prepare nitriles is the dehydration of amides. This method requires strong dehydrating agents like phosphorous pentoxide or boiling acetic anhydride for converting amides to nitriles. Another reagent namely, thionyl chloride also accomplishes the dehydration of amides, where amide acts as a nucleophile. The first step of the mechanism involves the nucleophilic attack by the amide on the thionyl chloride to form an intermediate. In the next step, the electron pairs...
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Oximes can be reduced to primary amines using catalytic hydrogenation, hydride reduction, or sodium metal reduction. The reduction of aliphatic and aromatic nitro compounds to primary amines takes place by either catalytic hydrogenation or by using active metals like Fe, Zn, and Sn in the presence of an acid.
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Nitrile-synthesizing enzyme: Screening, purification and characterization.

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Researchers identified cyanide-resistant bacteria capable of synthesizing beta-cyano-L-alanine (β-CNAla). This study details the purification and characterization of the β-CNAla synthase enzyme from Pseudomonas ovalis, offering insights into cyanide detoxification mechanisms.

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Area of Science:

  • Microbiology
  • Biochemistry
  • Enzymology

Background:

  • Cyanide is a potent toxin detrimental to most life forms.
  • Cyanide resistance in microorganisms is crucial for understanding detoxification pathways.
  • Beta-cyano-L-alanine (β-CNAla) synthesis is a known mechanism for cyanide detoxification.

Purpose of the Study:

  • To isolate and identify cyanide-resistant bacteria.
  • To investigate the β-CNAla synthetic activity in these resistant strains.
  • To purify and characterize the β-CNAla synthase enzyme from Pseudomonas ovalis.

Main Methods:

  • Screening soil and stock cultures for growth on cyanide-containing media.
  • Assaying for β-CNAla synthetic activity.
  • Purification of β-CNAla synthase via a nine-step process.
  • Enzyme characterization including molecular mass, subunit composition, optimal pH, temperature, substrate specificity, Km, and Vmax determination.

Main Results:

  • Numerous cyanide-resistant bacteria were isolated, most exhibiting β-CNAla synthetic activity.
  • Pseudomonas ovalis No. 111 was identified as a source of β-CNAla synthase.
  • The purified enzyme has a molecular mass of 60,000 Da, composed of two identical subunits.
  • Optimal activity was observed at pH 8.5-9.0 and 40-50°C, with specificity for O-acetyl-L-serine and β-chloro-DL-alanine.

Conclusions:

  • Cyanide-resistant bacteria effectively utilize β-CNAla synthesis for detoxification.
  • The characterized β-CNAla synthase from Pseudomonas ovalis is a key enzyme in this metabolic pathway.
  • Understanding this enzyme's properties provides a basis for further research into microbial cyanide remediation.