PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 19634918-2 2009 The noncovalent binding of the inhibitory flavonoids to alpha-synuclein and the covalent modification by the flavonoid quinone led to the restriction of the conformational changes in this natively unfolded protein and to the stabilization of soluble flavonoid-modified species of alpha-synuclein (monomers and oligomers). quinone 119-126 synuclein alpha Homo sapiens 280-295 17785456-6 2007 Cell-free studies using novel near infrared fluorescence methodology for the detection of covalent protein-ortho-quinone adducts showed that although covalent modification of alpha-syn occurs, this does not affect alpha-syn fibril formation. quinone 113-120 synuclein alpha Homo sapiens 175-184 29030055-11 2019 DOPAL oxidizes spontaneously to DOPAL-quinone, which probably converts alpha-synuclein to its toxic oligomeric form. quinone 38-45 synuclein alpha Homo sapiens 71-86 16008565-4 2005 The MS and NMR characterizations strongly demonstrate that DA and its analogs inhibit alpha-Syn fibrillization by a mechanism where the oxidation products (quinones) of DA analogs react with the amino groups of alpha-Syn chain, generating alpha-Syn-quinone adducts. quinone 156-163 synuclein alpha Homo sapiens 86-95 16008565-4 2005 The MS and NMR characterizations strongly demonstrate that DA and its analogs inhibit alpha-Syn fibrillization by a mechanism where the oxidation products (quinones) of DA analogs react with the amino groups of alpha-Syn chain, generating alpha-Syn-quinone adducts. quinone 156-163 synuclein alpha Homo sapiens 211-220 16008565-4 2005 The MS and NMR characterizations strongly demonstrate that DA and its analogs inhibit alpha-Syn fibrillization by a mechanism where the oxidation products (quinones) of DA analogs react with the amino groups of alpha-Syn chain, generating alpha-Syn-quinone adducts. quinone 156-163 synuclein alpha Homo sapiens 211-220 16008565-5 2005 It is likely that the amino groups of alpha-Syn undergo nucleophilic attack on the quinone moiety of DA analogs to form imino bonds. quinone 83-90 synuclein alpha Homo sapiens 38-47 32906170-11 2020 Probably via spontaneous oxidation, DOPAL potently oligomerizes and forms quinone-protein adducts with ("quinonizes") alpha-synuclein (AS), a major constituent in Lewy bodies, and DOPAL-induced AS oligomers impede vesicular storage. quinone 74-81 synuclein alpha Homo sapiens 118-133 11134896-9 2001 We suggest that NAC can perpetuate the redox cycle between the quinone and the semiquinone forms of the catecholestrogens, thereby enhancing the production of ROS. quinone 63-70 synuclein alpha Homo sapiens 16-19 1899328-7 1991 In the present study, we have explored kinetic and mechanistic features of the conversion of NAcDEE to NAc delta DEE and found that the reaction requires: (i) oxidation of NAcDEE to the quinone, (ii) the presence of a Lewis base as a catalyst (phosphate anion was the best of those tried in the pH range 6.0-8.0), and (iii) prevention of competing reactions such as Michael additions. quinone 186-193 synuclein alpha Homo sapiens 93-96 32538547-6 2020 RESULTS: DA modifies alpha-syn with the addition of dopamine-quinone (DAQ) into lysine sites of alpha-syn in vitro and the addition of DAQ and DOPAL (3,4-dihydroxyphenylacetaldehyde) in plasma samples. quinone 61-68 synuclein alpha Homo sapiens 21-30 32538547-6 2020 RESULTS: DA modifies alpha-syn with the addition of dopamine-quinone (DAQ) into lysine sites of alpha-syn in vitro and the addition of DAQ and DOPAL (3,4-dihydroxyphenylacetaldehyde) in plasma samples. quinone 61-68 synuclein alpha Homo sapiens 96-105 30112966-6 2018 We moreover observed that 6-OHDA-derived electrophilic quinone induced oxidative stress as indicated by a decrease in glutathione levels, and that this was suppressed by pretreatment with antioxidant NAC. quinone 55-62 synuclein alpha Homo sapiens 200-203