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Publications 2000 - 2004

Probing the Role of Tryptophans in Aequorea victoria Green Fluorescent Proteins with an Expanded Genetic Code
Citation key 028.2004.budisa
Author Budisa, N. and Pal, P. P. and Alefelder, S. and Birle, P. and Krywcun, T. and Rubini, M. and Wenger, W. and Bae, J. H. and Steiner, S.
Pages 191-202
Year 2004
DOI 10.1515/BC.2004.038
Journal Biol. Chem.
Volume 385
Number 2
Abstract The expanded genetic code in combination with site-directed mutagenesis was used to probe spectroscopic and structural roles of tryptophan (Trp) residues in Aequorea victoria green fluorescent proteins (avGFPs). Nine different halogen-, chalcogen-, and methyl-containing Trp isosteric analogues and surrogates were incorporated into avGFPs containing indole moieties in, and outside of, the chromophore, by the use of the selective pressure incorporation method. Such isosteric replacements introduced minimal local geometry changes in indole moieties, often to the level of single atomic exchange ('atomic mutation') and do not affect three-dimensional structures of avGFPs but induce changes in spectral properties. Our approach offers a new platform to re-evaluate issues like resonance transfer, mechanisms of chromophore formation and maturation, as well as the importance of local geometry and weak sulphur-aromatic interactions for avGFP spectral properties and structural stability. The library of novel tailor-made avGFP mutants and variants generated in this work has demonstrated not only the potentials of the expanded genetic code to study spectroscopic functions, but also a new approach to generate tailor-made proteins with interesting and useful spectral properties.
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