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Sökning: WFRF:(Vepsalainen J.)

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  • Castro-Oropeza, R., et al. (författare)
  • Aminooxy analog of histamine is an efficient inhibitor of mammalian l-histidine decarboxylase: combined in silico and experimental evidence
  • 2014
  • Ingår i: Amino Acids. - : Springer Science and Business Media LLC. - 0939-4451 .- 1438-2199. ; 46:3, s. 621-631
  • Tidskriftsartikel (refereegranskat)abstract
    • Histamine plays highlighted roles in the development of many common, emergent and rare diseases. In mammals, histamine is formed by decarboxylation of l-histidine, which is catalyzed by pyridoxal-5'-phosphate (PLP) dependent histidine decarboxylase (HDC, EC 4.1.1.22). The limited availability and stability of the protein have delayed the characterization of its structure-function relationships. Our previous knowledge on mammalian HDC, derived from both in silico and experimental approaches, indicates that an effective competitive inhibitor should be capable to form an "external aldimine-like structure" and have an imidazole group, or its proper mimetic, which provides additional affinity of PLP-inhibitor adduct to the HDC active center. This is confirmed using HEK-293 cells transfected to express human HDC and the aminooxy analog of histidine, 4(5)-aminooxymethylimidazole (O-IMHA, IC50 a parts per thousand 2 x 10(-7) M) capable to form a PLP-inhibitor complex (oxime) in the enzyme active center. Taking advantage of the availability of the human HDC X-ray structure, we have also determined the potential interactions that could stabilize this oxime in the active site of mammalian HDC.
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  • Meinander, K., et al. (författare)
  • Pseudopeptides with a centrally positioned alkene-based disulphide bridge mimetic stimulate kallikrein-related peptidase 3 activity
  • 2013
  • Ingår i: Medchemcomm. - : Royal Society of Chemistry (RSC). - 2040-2503 .- 2040-2511. ; 4:3, s. 549-553
  • Tidskriftsartikel (refereegranskat)abstract
    • Pseudopeptides based on the kallikrein-related peptidase 3 (KLK3) activating bicyclic peptide “C-4” comprising hydrocarbon-based disulphide bridge mimetics have been synthesized. After investigating different synthetic approaches, the pseudopeptides were successfully cyclized from two L-allylglycine side chains via an alkene ring-closing metathesis reaction during the peptide synthesis. The alkene-linker was formed in a 1 : 1 E/Z isomer ratio. The resulting pseudopeptides were almost as potent as the parent peptide, increasing the activity of KLK3 over four-fold at 200 μg ml−1 (130–140 μM) concentrations.
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  • Resultat 1-10 av 14

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