Recovery of Red Fluorescent Protein Chromophore Maturation Deficiency through Rational Design
- California Institute of Technology (CalTech), Pasadena, CA (United States). Division of Biology; DOE/OSTI
- Univ. of Ottawa, ON (Canada). Dept. of Chemistry
- California Institute of Technology (CalTech), Pasadena, CA (United States). Division of Biology; California Institute of Technology (CalTech), Pasadena, CA (United States). Division of Chemistry and Chemical Engineering
- Univ. of Ottawa, ON (Canada). Dept. of Chemistry; Univ. of Ottawa, ON (Canada). Centre for Catalysis Research and Innovation
Red fluorescent proteins (RFPs) derived from organisms in the class Anthozoa have found widespread application as imaging tools in biological research. For most imaging experiments, RFPs that mature quickly to the red chromophore and produce little or no green chromophore are most useful. In this study, we used rational design to convert a yellow fluorescent mPlum mutant to a red-emitting RFP without reverting any of the mutations causing the maturation deficiency and without altering the red chromophore’s covalent structure. We also created an optimized mPlum mutant (mPlum-E16P) that matures almost exclusively to the red chromophore. Analysis of the structure/function relationships in these proteins revealed two structural characteristics that are important for efficient red chromophore maturation in DsRed-derived RFPs. The first is the presence of a lysine residue at position 70 that is able to interact directly with the chromophore. The second is an absence of non-bonding interactions limiting the conformational flexibility at the peptide backbone that is oxidized during red chromophore formation. Satisfying or improving these structural features in other maturation-deficient RFPs may result in RFPs with faster and more complete maturation to the red chromophore.
- Research Organization:
- SLAC National Accelerator Laboratory, Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
- Sponsoring Organization:
- USDOE Office of Science (SC), Biological and Environmental Research (BER); Gordon and Betty Moore Foundation
- Grant/Contract Number:
- AC02-76SF00515
- OSTI ID:
- 1627573
- Journal Information:
- PLoS ONE, Journal Name: PLoS ONE Journal Issue: 12 Vol. 7; ISSN 1932-6203
- Publisher:
- Public Library of ScienceCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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