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Recovery of Red Fluorescent Protein Chromophore Maturation Deficiency through Rational Design

Journal Article · · PLoS ONE
 [1];  [2];  [2];  [3];  [4]
  1. California Institute of Technology (CalTech), Pasadena, CA (United States). Division of Biology; DOE/OSTI
  2. Univ. of Ottawa, ON (Canada). Dept. of Chemistry
  3. 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
  4. 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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Cited By (5)

A far-red fluorescent protein evolved from a cyanobacterial phycobiliprotein journal August 2016
Rational design of ultrastable and reversibly photoswitchable fluorescent proteins for super-resolution imaging of the bacterial periplasm journal January 2016
Monomerization of far-red fluorescent proteins journal November 2018
Sensitive red protein calcium indicators for imaging neural activity posted_content February 2016
Sensitive red protein calcium indicators for imaging neural activity journal March 2016

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