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A dual microwave and optical spectroscopic study of a capped cysteine amino acid isolated in a supersonic expansion, combined with quantum chemistry modelling, enabled us to characterize the conformational preferences of Cys embedded in a protein chain. IR/UV double resonance spectroscopy provided evidence for the coexistence of two conformers, assigned to folded and extended backbones (with classical C7 and C5 backbone H-bonding respectively), each of them additionally stabilized by specific main-chain/side-chain H-bonding, where the su
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