Engineering of a calcium-ion binding site into the RC-LH1-PufX complex of Rhodobacter sphaeroides to enable ion-dependent spectral red-shifting
Abstract
The reaction centre-light harvesting 1 (RC-LH1) complex of Thermochromatium (Tch.) tepidum has a unique calcium-ion binding site that enhances thermal stability and red-shifts the absorption of LH1 from 880 nm to 915 nm in the presence of calcium-ions. The LH1 antenna of mesophilic species of phototrophic bacteria such as Rhodobacter (Rba.) sphaeroides does not possess such properties. We have engineered calcium-ion binding into the LH1 antenna of Rba. sphaeroides by progressively modifying the native LH1 polypeptides with sequences from Tch. tepidum. We show that acquisition of the C-terminal domains from LH1 α and β of Tch. tepidum is sufficient to activate calcium-ion binding and the extent of red-shifting increases with the proportion of Tch. tepidum sequence incorporated. However, full exchange of the LH1 polypeptides with those of Tch. tepidum results in misassembled core complexes. Isolated α and β polypeptides from our most successful mutant were reconstituted in vitro with BChl a to form an LH1-type complex, which was stabilised 3-fold by calcium-ions. Additionally, carotenoid specificity was changed from spheroidene found in Rba. sphaeroides to spirilloxanthin found in Tch. tepidum, with the latter enhancing in vitro formation of LH1. These data show that the C-terminal LH1 α/β domains of Tch. tepidummore »
- Authors:
- Publication Date:
- Research Org.:
- Northwestern Univ., Evanston, IL (United States); Univ. of Sheffield (United Kingdom); Energy Frontier Research Centers (EFRC) (United States). Photosynthetic Antenna Research Center (PARC)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); Biotechnology and Biological Sciences Research Council (BBSRC); European Research Council (ERC)
- OSTI Identifier:
- 1377998
- Alternate Identifier(s):
- OSTI ID: 1499113
- Grant/Contract Number:
- SC0001035; BB/M000265/1; 338895
- Resource Type:
- Published Article
- Journal Name:
- Biochimica et Biophysica Acta - Bioenergetics
- Additional Journal Information:
- Journal Name: Biochimica et Biophysica Acta - Bioenergetics Journal Volume: 1858 Journal Issue: 11; Journal ID: ISSN 0005-2728
- Publisher:
- Elsevier
- Country of Publication:
- Netherlands
- Language:
- English
- Subject:
- 59 BASIC BIOLOGICAL SCIENCES; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Rhodobacter sphaeroides; Thermochromatium tepidum; protein engineering; reaction centre; antenna complex; calcium-ion binding
Citation Formats
Swainsbury, David J. K., Martin, Elizabeth C., Vasilev, Cvetelin, Parkes-Loach, Pamela S., Loach, Paul A., and Neil Hunter, C. Engineering of a calcium-ion binding site into the RC-LH1-PufX complex of Rhodobacter sphaeroides to enable ion-dependent spectral red-shifting. Netherlands: N. p., 2017.
Web. doi:10.1016/j.bbabio.2017.08.009.
Swainsbury, David J. K., Martin, Elizabeth C., Vasilev, Cvetelin, Parkes-Loach, Pamela S., Loach, Paul A., & Neil Hunter, C. Engineering of a calcium-ion binding site into the RC-LH1-PufX complex of Rhodobacter sphaeroides to enable ion-dependent spectral red-shifting. Netherlands. https://doi.org/10.1016/j.bbabio.2017.08.009
Swainsbury, David J. K., Martin, Elizabeth C., Vasilev, Cvetelin, Parkes-Loach, Pamela S., Loach, Paul A., and Neil Hunter, C. Fri .
"Engineering of a calcium-ion binding site into the RC-LH1-PufX complex of Rhodobacter sphaeroides to enable ion-dependent spectral red-shifting". Netherlands. https://doi.org/10.1016/j.bbabio.2017.08.009.
@article{osti_1377998,
title = {Engineering of a calcium-ion binding site into the RC-LH1-PufX complex of Rhodobacter sphaeroides to enable ion-dependent spectral red-shifting},
author = {Swainsbury, David J. K. and Martin, Elizabeth C. and Vasilev, Cvetelin and Parkes-Loach, Pamela S. and Loach, Paul A. and Neil Hunter, C.},
abstractNote = {The reaction centre-light harvesting 1 (RC-LH1) complex of Thermochromatium (Tch.) tepidum has a unique calcium-ion binding site that enhances thermal stability and red-shifts the absorption of LH1 from 880 nm to 915 nm in the presence of calcium-ions. The LH1 antenna of mesophilic species of phototrophic bacteria such as Rhodobacter (Rba.) sphaeroides does not possess such properties. We have engineered calcium-ion binding into the LH1 antenna of Rba. sphaeroides by progressively modifying the native LH1 polypeptides with sequences from Tch. tepidum. We show that acquisition of the C-terminal domains from LH1 α and β of Tch. tepidum is sufficient to activate calcium-ion binding and the extent of red-shifting increases with the proportion of Tch. tepidum sequence incorporated. However, full exchange of the LH1 polypeptides with those of Tch. tepidum results in misassembled core complexes. Isolated α and β polypeptides from our most successful mutant were reconstituted in vitro with BChl a to form an LH1-type complex, which was stabilised 3-fold by calcium-ions. Additionally, carotenoid specificity was changed from spheroidene found in Rba. sphaeroides to spirilloxanthin found in Tch. tepidum, with the latter enhancing in vitro formation of LH1. These data show that the C-terminal LH1 α/β domains of Tch. tepidum behave autonomously, and are able to transmit calcium-ion induced conformational changes to BChls bound to the rest of a foreign antenna complex. Thus, elements of foreign antenna complexes, such as calcium-ion binding and blue/red switching of absorption, can be ported into Rhodobacter sphaeroides using careful design processes.},
doi = {10.1016/j.bbabio.2017.08.009},
journal = {Biochimica et Biophysica Acta - Bioenergetics},
number = 11,
volume = 1858,
place = {Netherlands},
year = {Fri Aug 18 00:00:00 EDT 2017},
month = {Fri Aug 18 00:00:00 EDT 2017}
}
https://doi.org/10.1016/j.bbabio.2017.08.009
Web of Science
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