schiff base वाक्य
उदाहरण वाक्य
मोबाइल
- The PLP is anchored by means of a lysine, which forms an aldimine Schiff base linkage with the PLP aldehyde.
- For example, Schiff base formation can be categorized as a forming new covalent bonds between a carbonyl and primary amine.
- Retinal binds covalently to a lysine on the transmembrane helix nearest the C-terminus of the protein through a Schiff base linkage.
- If this group is " not " a hydrogen atom, then the compound can sometimes be referred to as a Schiff base.
- The second water molecule is a product of the dehydration of the carbinolamine that leads to the formation of the Schiff base.
- The Mannich reaction is an example of nucleophilic addition of an amine to a carbonyl group followed by dehydration to the Schiff base.
- The reaction mechanism proceeds via the formation of a Schiff base intermediate, which is covalently attached to lysine 115 in the active site.
- The Lysine, which is involved in the formation of the Schiff base is coordinated by a phosphate ion and two solvent water molecules.
- The term Schiff base is normally applied to these compounds when they are being used as ligands to form coordination complexes with metal ions.
- These results provided support that the mechanism proceeds through a Schiff base intermediate between the ketoacid and an amino acid residue on the enzyme.
- This intermediate rearranges to form a Schiff base attached to putrescine, which is attacked by lysine to release putrescine product and reform PLP-bound ODC.
- The product formed is an imidazolin-4-one which can be either isolated as a diastereomers or be used to give a Schiff base via ring opening.
- In the early work, the cyclization was accomplished by heating the Schiff base without a solvent and the yields were very moderate ( below 30 % ).
- Lysine Residue 133 serves as the nucleophile and attacks the carbonyl group of 2-Keto-3-deoxy-6-phosphogluconate to form a protonated carbinolamine intermediate, also known as a Schiff base intermediate.
- The newly formed oxide is then twice protonated to form the Schiff base, which then undergoes keto-enol tautomerization before an 4-hydroxyquinoline, the final product of the Conrad Limpach synthesis.
- After Schiff base formation, the fourth hydroxyl group on the fructose backbone is then deprotonated by an aspartate residue ( aspartate 33 ), which results in an aldol cleavage.
- The changes provide rationales for how relaxation of the distorted retinal causes movements of water and protein atoms that result in vectorial proton transfers to and from the Schiff base.
- If the pK a were not perturbed downward, the lysine residue would remain protonated as an ammonium cation, making it unreactive for the nucleophilic addition necessary to form the Schiff base.
- Further research led to the isolation of an active site peptide sequence and identification of the active site lysine, Lys115, that is involved in the formation of the Schiff base intermediate.
- His research group has synthesized a number of Schiff base polymers and have developed new stationary phase for Gas Chromatography and sensitive Liquid Chromatography procedures for the determination of pesticide malathion.
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