6533b7d0fe1ef96bd125a502
RESEARCH PRODUCT
Cyclometalated Au(III) Complexes for Cysteine Arylation in Zinc Finger Protein Domains: Towards Controlled Reductive Elimination
Margot N. WenzelGiampaolo BaroneAngela CasiniDidier BourissouSophie R. ThomasRiccardo Bonsignoresubject
Models Molecularzinc finger proteinProtein DomainPeptidecatalysi010402 general chemistry01 natural sciencesCatalysisReductive eliminationCatalysisThermodynamicOrganogold Compounds[CHIM]Chemical SciencesReactivity (chemistry)CysteineZinc fingerchemistry.chemical_classificationAqueous solutionCoordination Complexe010405 organic chemistryOrganic Chemistryreductive eliminationZinc FingersGeneral ChemistryCombinatorial chemistry0104 chemical sciencescysteine arylationchemistrySettore CHIM/03 - Chimica Generale E Inorganicagold complexeQuantum TheoryGoldCysteinedescription
With the aim of exploiting the use of organometallic species for the efficient modification of proteins through C-atom transfer, the gold-mediated cysteine arylation through a reductive elimination process occurring from the reaction of cyclometalated AuIII C^N complexes with a zinc finger peptide (Cys2His2 type) is here reported. Among the four selected AuIII cyclometalated compounds, the [Au(CCON)Cl2] complex featuring the 2-benzoylpyridine (CCON) scaffold was identified as the most prone to reductive elimination and Cys arylation in buffered aqueous solution (pH 7.4) at 37 °C by high-resolution LC electrospray ionization mass spectrometry. DFT and quantum mechanics/molecular mechanics (QM/MM) studies permitted to propose a mechanism for the title reaction that is in line with the experimental results. Overall, the results provide new insights into the reactivity of cytotoxic organogold compounds with biologically important zinc finger domains and identify initial structure–activity relationships to enable AuIII-catalyzed reductive elimination in aqueous media.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2019-05-09 |