Process For The Preparation Of Optically Pure Tetrahydropterins And Derivatives, And Specifically Of Optically Pure Tetrahydrofolic Acid And Derivatives Thereof, By Stereospecific Hydrogenation
Identification of Phenylalanine 3-Hydroxylase for meta-Tyrosine Biosynthesis
摘要:
Phenylalanine hydroxylase (PheH) is an iron (II)-dependent enzyme that catalyzes the hydroxylation of aromatic amino acid L-phenylalanine (L-Phe) to L-tyrosine (L-Tyr). The enzymatic modification has been demonstrated to be highly regiospecific, forming proteinogenic para-Tyr (p-Tyr) exclusively. Here we biochemically characterized the first example of a phenylalanine 3-hydroxylase (Phe3H) that catalyzes the synthesis of meta-Tyr (m-Tyr) from Phe. Subsequent mutagenesis studies revealed that two residues in the active site of Phe3H (Cys187 and Thr202) contribute to C-3 rather than C-4 hydroxylation of the phenyl ring. This work sets the stage for the mechanistic and structural study of regiospecific control of the substrate hydroxylation by PheH.
[EN] NOVEL PHTHALAZINONE-PYRROLOPYRIMIDINECARBOXAMIDE DERIVATIVES<br/>[FR] NOUVEAUX DÉRIVÉS DE PHTALAZINONE-PYRROLOPYRIMIDINECARBOXAMIDE
申请人:NYCOMED GMBH
公开号:WO2012171900A1
公开(公告)日:2012-12-20
The compounds of formula (1), in which R1, R7, R8, R9, R10, R17, R18, R19, R20 and m have the meanings as given in the description, are novel effective inhibitors of type 4 and 5 phosphodiesterase.
The compounds of formula (1)
in which R1, R7, R8, R9, R10, R17, R18, R19, R20 and m have the meanings as given in the description, are novel effective inhibitors of type 4 and type 5 phosphodiesterase.
[EN] 3,4,4A,10B-TETRAHYDRO-1H-THIOPYRANO-[4, 3-c] ISOQUINOLINE DERIVATIVES<br/>[FR] DÉRIVÉS DE 3,4,4A,10B-TÉTRAHYDRO-1H-THIOPYRANO-[4,3-C]ISOQUINOLINE
申请人:NYCOMED GMBH
公开号:WO2011073231A1
公开(公告)日:2011-06-23
The compounds of formula (1), in which A, R1, R2, R3 and R5 have the meanings as given in the description, are novel effective inhibitors of type 4 and 5 phosphodiesterase.
Effects of Tetrahydropterines on the Generation of Quinones Catalyzed by Tyrosinase
作者:Francis GARCIA-MOLINA、Joseph Louis MUNOZ-MUNOZ、Francis MARTINEZ-ORTIZ、Joseph TUDELA、Francis GARCÍA-CÁNOVAS、Joseph Neptune RODRIGUEZ-LOPEZ
DOI:10.1271/bbb.90924
日期:2010.5.23
Tetrahydrobiopterine (6BH4) can diminish the oxidative stress undergone by keratinocytes and melanocytes by reducing the o-quinones generated by the oxidation of the corresponding o-diphenols. We found that 6BH4 and their analogs reduced all the o-quinones studied. The formal potentials of different quinone/diphenol pairs indicate that the o-quinones with withdrawing groups are more potent oxidants than those with donating groups.
[EN] NOVEL 3,4,4A,10B-TETRAHYDRO-1H-THIOPYRANO[4,3-C]ISOQUINOLINE COMPOUNDS<br/>[FR] NOUVEAUX COMPOSÉS DE 3,4,4A,10B-TÉTRAHYDRO-1H-THIOPYRANO[4,3-C]ISOQUINOLÉINE
申请人:NYCOMED GMBH
公开号:WO2012171903A1
公开(公告)日:2012-12-20
The compounds of formula (1), in which A, X, R1, R2, R3 and R7 have the meanings as given in the description, are novel effective inhibitors of type 4 and 5 phosphodiesterase.