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Proline organocatalysis is the use of proline as an organocatalyst in organic chemistry. This theme is often considered the starting point for the area of organocatalysis, even though early discoveries went unappreciated. [1] Modifications, such as MacMillan’s catalyst and Jorgensen's catalysts, proceed with excellent stereocontrol. [2]: 5574 [3]
In enzymology, a 4-oxoproline reductase (EC 1.1.1.104) is an enzyme that catalyzes the chemical reaction. 4-oxo-L-proline + NADH + H + cis-4-hydroxy-L-proline + NAD +. Thus, the three substrates of this enzyme are 4-oxo-L-proline, NADH, and H +, whereas its two products are cis-4-hydroxy-L-proline and NAD +.
Furthermore, proline is rarely found in α and β structures as it would reduce the stability of such structures, because its side chain α-nitrogen can only form one nitrogen bond. Additionally, proline is the only amino acid that does not form a red-purple colour when developed by spraying with ninhydrin for uses in chromatography. Proline ...
Prolyl isomerase (also known as peptidylprolyl isomerase or PPIase) is an enzyme (EC 5.2.1.8) found in both prokaryotes and eukaryotes that interconverts the cis and trans isomers of peptide bonds with the amino acid proline. [1] Proline has an unusually conformationally restrained peptide bond due to its cyclic structure with its side chain ...
Hyperprolinemia type II results in proline levels in the blood between 10 and 15 times higher than normal, and high levels of a related compound called pyrroline-5-carboxylate. This rare form of the disorder may appear benign at times, [ 2 ] but often involves seizures, convulsions, and intellectual disability.
The depolarization process causes voltage-controlled calcium channels (Ca2+) opening, allowing the calcium to flow into the cells. An increased calcium level activates phospholipase C, which cleaves the membrane phospholipid phosphatidylinositol 4,5-bisphosphate into Inositol 1,4,5-trisphosphate (IP3) and diacylglycerol (DAG).
The Hajos–Parrish–Eder–Sauer–Wiechert and Barbas-List [1] reactions in organic chemistry are a family of proline-catalysed asymmetric aldol reactions.. In the 1970s, two research groups discovered (and published) almost simultaneously their discoveries of two related intramolecular reactions: Zoltan Hajos and David Parrish at Hoffmann-La Roche [2] [3] and Rudolf Wiechert et al at ...
Procollagen-proline dioxygenase, commonly known as prolyl hydroxylase, is a member of the class of enzymes known as alpha-ketoglutarate-dependent hydroxylases. These enzymes catalyze the incorporation of oxygen into organic substrates through a mechanism that requires alpha-Ketoglutaric acid , Fe 2+ , and ascorbate .
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