Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

Structural and Biophysical Properties of a [4Fe-4S] Ferredoxin-Like Protein from Synechocystis sp. PCC 6803 with a Unique Two Domain Structure

Journal Article · · Journal of Inorganic Biochemistry

Electron carrier proteins (ECPs), binding iron-sulfur clusters, are vital components within the intricate network of metabolic and photosynthetic reactions. They play a crucial role in the distribution of reducing equivalents. In Synechocystis sp. PCC 6803, the ECP network includes at least nine ferredoxins. Previous research, including global expression analyses and protein binding studies, has offered initial insights into the functional roles of individual ferredoxins within this network. This study primarily focuses on Ferredoxin 9 (slr2059). Through sequence analysis and computational modeling, Ferredoxin 9 emerges as a unique ECP with a distinctive two-domain architecture. It consists of a C-terminal iron-sulfur binding domain and an N-terminal domain with homology to Nil-domain proteins, connected by a structurally rigid 4-amino acid linker. Notably, in contrast to canonical [2Fe-2S] ferredoxins exemplified by PetF (ssl0020), which feature highly acidic surfaces facilitating electron transfer with photosystem I reaction centers, models of Ferredoxin 9 reveal a more neutral to basic protein surface. Using a combination of electron paramagnetic resonance spectroscopy and square-wave voltammetry on heterologously produced Ferredoxin 9, this study demonstrates that the protein coordinates 2x[4Fe-4S]2+/1+ redox-active and magnetically interacting clusters, with measured redox potentials of -420 +/- 9 mV and -516 +/- 10 mV vs SHE. A more in-depth analysis of Fdx9's unique structure and protein sequence suggests that this type of Nil-2[4Fe-4S] multi-domain ferredoxin is well conserved in cyanobacteria, bearing structural similarities to proteins involved in homocysteine synthesis in methanogens.

Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division
DOE Contract Number:
AC36-08GO28308
OSTI ID:
2280799
Report Number(s):
NREL/JA-2700-87453; MainId:88228; UUID:23788bd9-dd2c-496b-8503-c1b164bfe8cc; MainAdminID:71491
Journal Information:
Journal of Inorganic Biochemistry, Journal Name: Journal of Inorganic Biochemistry Vol. 251
Country of Publication:
United States
Language:
English

References (56)

Discovery of a Novel Ferredoxin from Azotobacter vinelandii Containing Two [4Fe-4S] Clusters with Widely Differing and Very Negative Reduction Potentials journal March 1998
Metabolic effects of vitamin B12 on physiology, stress resistance, growth rate and biomass productivity of Cyanobacterium stanieri planktonic and biofilm cultures journal September 2019
Cysteine and Cysteine-Related Signaling Pathways in Arabidopsis thaliana journal February 2014
Responses to Oxidative and Heavy Metal Stresses in Cyanobacteria: Recent Advances journal December 2014
Characterization of Two 2[4Fe4S] Ferredoxins from Clostridium acetobutylicum journal December 2007
Function and Regulation of Ferredoxins in the Cyanobacterium, Synechocystis PCC6803: Recent Advances journal November 2014
Diversification of Ferredoxins across Living Organisms journal September 2021
EPR-detectable redox centers of the periplasmic hydrogenase from Desulfovibrio vulgaris. journal December 1988
Cellular Assays for Ferredoxins: A Strategy for Understanding Electron Flow through Protein Carriers That Link Metabolic Pathways journal December 2016
A unique ferredoxin acts as a player in the low-iron response of photosynthetic organisms journal December 2018
On the Nature of the Spin Coupling between the Iron-Sulfur Clusters in the Eight-Iron Ferredoxins journal July 1974
New additions to the ClusPro server motivated by CAPRI: Development of the ClusPro Server journal January 2017
Redox Potentials of Iron–Sulfur Clusters in Type I Photosynthetic Reaction Centers journal May 2023
EasySpin, a comprehensive software package for spectral simulation and analysis in EPR journal January 2006
NMR of Chromatium vinosum ferredoxin: evidence for structural inequivalence and impeded electron transfer between the two [4Fe-4S] clusters journal January 1995
Spin concentration measurements of high-spin (g′ = 4.3) rhombic iron(III) ions in biological samples: theory and application journal October 2007
Novel proteins for homocysteine biosynthesis in anaerobic microorganisms journal November 2014
Natural engineering principles of electron tunnelling in biological oxidation–reduction journal November 1999
EPR spectroscopy of complex biological iron–sulfur systems journal February 2018
Characterization of the Unbound 2[Fe4S4]-Ferredoxin-Like Photosystem I Subunit PsaC from the Cyanobacterium Synechococcus elongatus journal November 1997
Reduction Potentials of [FeFe]-Hydrogenase Accessory Iron–Sulfur Clusters Provide Insights into the Energetics of Proton Reduction Catalysis journal July 2017
Oxidation-reduction properties of the two Fe4S4 clusters in Clostridium pasteurianum ferredoxin. journal April 1987
Electron paramagnetic resonance and other properties of hydrogenases isolated from Desulfovibrio vulgaris (strain Hildenborough) and Megasphaera elsdenii journal October 1983
Functional analysis of Rossmann-like domains reveals convergent evolution of topology and reaction pathways journal December 2019
Protein-Repairing Methionine Sulfoxide Reductases in Photosynthetic Organisms: Gene Organization, Reduction Mechanisms, and Physiological Roles journal March 2009
The bacterial-type [4Fe–4S] ferredoxin 7 has a regulatory function under photooxidative stress conditions in the cyanobacterium Synechocystis sp. PCC 6803 journal August 2014
Parsing redox potentials of five ferredoxins found within Thermotoga maritima: T. maritima ferredoxin redox potentials journal December 2018
The High-Affinity E. coli Methionine ABC Transporter: Structure and Allosteric Regulation journal July 2008
Homocysteine Is Biosynthesized from Aspartate Semialdehyde and Hydrogen Sulfide in Methanogenic Archaea journal May 2015
Metalloproteins Containing Cytochrome, Iron–Sulfur, or Copper Redox Centers journal March 2014
Plant type ferredoxins and ferredoxin-dependent metabolism: Chloroplast ferredoxins journal January 2013
Electron spin relaxation of iron-sulphur proteins studied by microwave power saturation journal December 1978
An alternative plant-like cyanobacterial ferredoxin with unprecedented structural and functional properties journal November 2019
[27] Rapid colorimetric micromethod for the quantitation of complexed iron in biological samples book January 1988
Persulfide Formation Mediates Cysteine and Homocysteine Biosynthesis in Methanosarcina acetivorans journal February 2017
Characterization and determination of the redox properties of the 2[4Fe-4S] ferredoxin from Methanosarcina barkeri strain MS journal December 1994
Ferrodoxin and flavodoxin from the cyanobacterium Synechocystis sp PCC 6803 journal July 1992
Integrative analysis of large scale expression profiles reveals core transcriptional response and coordination between multiple cellular processes in a cyanobacterium journal August 2010
Electronic Structure Investigation and Parametrization of Biologically Relevant Iron–Sulfur Clusters journal February 2014
What is the probability of a chance prediction of a protein structure with an rmsd of 6 å? journal April 1998
Expression and regulation of the crucial plant-like ferredoxin of cyanobacteria journal July 2003
Highly accurate protein structure prediction with AlphaFold journal July 2021
Structural snapshots along the reaction pathway of ferredoxin–thioredoxin reductase journal July 2007
Characterization of Ferredoxin:Thioredoxin Reductase Modified by Site-directed Mutagenesis journal February 2004
General magnetic dipolar interaction of spin-spin coupled molecular dimers. Application to an EPR spectrum of xanthine oxidase journal September 1979
CyanoBase, a www database containing the complete nucleotide sequence of the genome of Synechocystis sp. strain PCC6803 journal January 1998
Performance and Its Limits in Rigid Body Protein-Protein Docking journal September 2020
The Two [4Fe-4S] Clusters in Chromatium vinosumFerredoxin Have Largely Different Reduction Potentials journal June 1998
The Bidirectional NiFe-hydrogenase in Synechocystis sp. PCC 6803 Is Reduced by Flavodoxin and Ferredoxin and Is Essential under Mixotrophic, Nitrate-limiting Conditions journal December 2013
Determination of cooperative interaction between clusters in Clostridium pasteurianum 2 (4Fe-4S) ferredoxin. journal June 1979
Electrostatics of nanosystems: Application to microtubules and the ribosome journal August 2001
A screen for potential ferredoxin electron transfer partners uncovers new, redox dependent interactions journal February 2011
Elucidating the mechanisms of coupled electron transfer and catalytic reactions by protein film voltammetry journal April 2006
Iron–sulfur clusters in type I reaction centers journal October 2001
Targeted deletion and mutational analysis of the essential (2Fe–2S) plant‐like ferredoxin in Synechocystis PCC6803 by plasmid shuffling journal May 1998
Proteomic analysis of Synechocystis sp. PCC6803 responses to low-temperature and high light conditions journal July 2014

Similar Records

Functional roles of the [2Fe-2S] clusters in Synechocystis PCC 6803 Hox [NiFe]-hydrogenase reactivity with ferredoxins
Journal Article · Sun Oct 27 20:00:00 EDT 2024 · Journal of Biological Chemistry · OSTI ID:2561249

The [4Fe-4S] Cluster of HydF Is Essential for [FeFe]-Hydrogenase Maturation
Journal Article · Tue Dec 09 19:00:00 EST 2025 · Journal of the American Chemical Society · OSTI ID:3010489

Structure and Function of a Bacterial Microcompartment Shell Protein Engineered to Bind a [4Fe-4S] Cluster
Journal Article · Wed Dec 23 19:00:00 EST 2015 · Journal of the American Chemical Society · OSTI ID:1713208