skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Fluorescent Probes for Tracking the Transfer of Iron–Sulfur Cluster and Other Metal Cofactors in Biosynthetic Reaction Pathways

Journal Article · · Journal of the American Chemical Society
DOI:https://doi.org/10.1021/ja510998s· OSTI ID:1167284
 [1];  [1];  [1];  [1];  [1];  [1]
  1. Department of Biochemistry and Biophysics and ‡Department of Chemistry, Texas A&M University, College Station, Texas 77842-3012, United States

Iron–sulfur (Fe–S) clusters are protein cofactors that are constructed and delivered to target proteins by elaborate biosynthetic machinery. Mechanistic insights into these processes have been limited by the lack of sensitive probes for tracking Fe–S cluster synthesis and transfer reactions. Here we present fusion protein- and intein-based fluorescent labeling strategies that can probe Fe–S cluster binding. The fluorescence is sensitive to different cluster types ([2Fe–2S] and [4Fe–4S] clusters), ligand environments ([2Fe–2S] clusters on Rieske, ferredoxin (Fdx), and glutaredoxin), and cluster oxidation states. The power of this approach is highlighted with an extreme example in which the kinetics of Fe–S cluster transfer reactions are monitored between two Fdx molecules that have identical Fe–S spectroscopic properties. This exchange reaction between labeled and unlabeled Fdx is catalyzed by dithiothreitol (DTT), a result that was confirmed by mass spectrometry. DTT likely functions in a ligand substitution reaction that generates a [2Fe–2S]–DTT species, which can transfer the cluster to either labeled or unlabeled Fdx. The ability to monitor this challenging cluster exchange reaction indicates that real-time Fe–S cluster incorporation can be tracked for a specific labeled protein in multicomponent assays that include several unlabeled Fe–S binding proteins or other chromophores. Such advanced kinetic experiments are required to untangle the intricate networks of transfer pathways and the factors affecting flux through branch points. High sensitivity and suitability with high-throughput methodology are additional benefits of this approach. Lastly, we anticipate that this cluster detection methodology will transform the study of Fe–S cluster pathways and potentially other metal cofactor biosynthetic pathways.

Research Organization:
Texas A&M Univ., College Station, TX (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-04ER15520
OSTI ID:
1167284
Alternate ID(s):
OSTI ID: 1346169
Journal Information:
Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Vol. 137 Journal Issue: 1; ISSN 0002-7863
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 19 works
Citation information provided by
Web of Science

References (53)

Estimation of labile sulfide in iron-sulfur proteins journal October 1975
Building Fe–S proteins: bacterial strategies journal June 2010
Ferrozine---a new spectrophotometric reagent for iron journal June 1970
Determination of quality of pyridoxal-5′-phosphate enzyme preparations by spectroscopic methods journal April 2005
Structure, Function, and Formation of Biological Iron-Sulfur Clusters journal June 2005
Redox Control of Human Mitochondrial Outer Membrane Protein MitoNEET [2Fe-2S] Clusters by Biological Thiols and Hydrogen Peroxide journal January 2014
Physical and genetic map of the major nif gene cluster from Azotobacter vinelandii. journal February 1989
Molecular Mechanism of the Redox-dependent Interaction between NADH-dependent Ferredoxin Reductase and Rieske-type [2Fe-2S] Ferredoxin journal October 2007
Circular Dichroism and X-ray Spectroscopies of Azotobacter vinelandii Nitrogenase Iron Protein : MgATP AND MgADP INDUCED PROTEIN CONFORMATIONAL CHANGES AFFECTING THE [4Fe-4S] CLUSTER AND CHARACTERIZATION OF A [2Fe-2S] FORM journal January 1996
A Third Bacterial System for the Assembly of Iron-Sulfur Clusters with Homologs in Archaea and Plastids journal June 2002
Spectroscopic and Functional Characterization of Iron-Bound Forms of Azotobacter vinelandii Nif IscA journal October 2012
Arabidopsis thaliana Nfu2 Accommodates [2Fe-2S] or [4Fe-4S] Clusters and Is Competent for in Vitro Maturation of Chloroplast [2Fe-2S] and [4Fe-4S] Cluster-Containing Proteins journal September 2013
The x-ray crystal structure of lysine-2,3-aminomutase from Clostridium subterminale journal September 2005
Studies on the Mechanism of Catalysis of Iron−Sulfur Cluster Transfer from IscU[2Fe2S] by HscA/HscB Chaperones journal November 2008
Redox Sensing: Novel Avenues and Paradigms journal April 2012
A dimer of the FeS cluster biosynthesis protein IscA from cyanobacteria binds a [2Fe2S] cluster between two protomers and transfers it to [2Fe2S] and [4Fe4S] apo proteins journal April 2003
Crystal Structure of Escherichia coli Fdx, an Adrenodoxin-Type Ferredoxin Involved in the Assembly of Iron−Sulfur Clusters journal August 2001
Metal trafficking: from maintaining the metal homeostasis to future drug design journal January 2009
Maturation of Iron-Sulfur Proteins in Eukaryotes: Mechanisms, Connected Processes, and Diseases journal June 2008
Molecular organization, biochemical function, cellular role and evolution of NfuA, an atypical Fe-S carrier: Role of NfuA in Fe-S biosynthesis journal September 2012
Fluorescent indicators for Ca2+based on green fluorescent proteins and calmodulin journal August 1997
IscA/SufA paralogues are required for the [4Fe-4S] cluster assembly in enzymes of multiple physiological pathways in Escherichia coli under aerobic growth conditions journal May 2009
Synthetic fluorescent sensors for studying the cell biology of metals journal February 2008
Fluorescence Detection of a Protein-Bound 2Fe2S Cluster journal January 2009
Facilitated Transfer of IscU–[2Fe2S] Clusters by Chaperone-Mediated Ligand Exchange journal November 2011
Monothiol Glutaredoxins Function in Storing and Transporting [Fe 2 S 2 ] Clusters Assembled on IscU Scaffold Proteins journal September 2012
Cochaperone Binding to LYR Motifs Confers Specificity of Iron Sulfur Cluster Delivery journal March 2014
Native Escherichia coli SufA, Coexpressed with SufBCDSE, Purifies as a [2Fe−2S] Protein and Acts as an Fe−S Transporter to Fe−S Target Enzymes journal April 2009
Human Ind1, an Iron-Sulfur Cluster Assembly Factor for Respiratory Complex I journal November 2009
Assembly of Iron-Sulfur Clusters: IDENTIFICATION OF AN journal May 1998
IscU as a Scaffold for Iron−Sulfur Cluster Biosynthesis:  Sequential Assembly of [2Fe-2S] and [4Fe-4S] Clusters in IscU journal July 2000
Fluorescence of a Histidine-Modified Enhanced Green Fluorescent Protein (EGFP) Effectively Quenched by Copper(II) Ions journal November 2012
Reagent for the Detection of Protein Thiocarboxylates in the Bacterial Proteome: Lissamine Rhodamine B Sulfonyl Azide journal August 2010
Specialized Function of Yeast Isa1 and Isa2 Proteins in the Maturation of Mitochondrial [4Fe-4S] Proteins journal December 2011
In Vitro Activation of Apo-Aconitase Using a [4Fe-4S] Cluster-Loaded Form of the IscU [Fe−S] Cluster Scaffolding Protein journal June 2007
Single-Molecule Analysis Reveals Differential Effect of ssDNA-Binding Proteins on DNA Translocation by XPD Helicase journal September 2009
Iron–sulfur cluster biogenesis and human disease journal August 2008
Iron–sulfur proteins in health and disease journal May 2010
Characteristics of self-quenching of the fluorescence of lipid-conjugated rhodamine in membranes. journal August 1990
The role of mitochondria in cellular iron–sulfur protein biogenesis and iron metabolism journal September 2012
A Proposed Role for the Azotobacter vinelandii NfuA Protein as an Intermediate Iron-Sulfur Cluster Carrier journal May 2008
Mechanism of glutaredoxin—ISU [2Fe–2S] cluster exchange journal January 2011
Inborn errors of copper metabolism book April 2013
Two Rapid Catalyst-Free Click Reactions for In Vivo Protein Labeling of Genetically Encoded Strained Alkene/Alkyne Functionalities journal August 2014
Glutathione Complexed Fe–S Centers journal June 2012
Subcellular compartmentalization of human Nfu, an iron-sulfur cluster scaffold protein, and its ability to assemble a [4Fe-4S] cluster journal July 2003
Structural Basis for Delivery of the Intact [Fe2S2] Cluster by Monothiol Glutaredoxin journal June 2009
Mechanism and energetics of green fluorescent protein chromophore synthesis revealed by trapped intermediate structures journal October 2003
IscA, an Alternate Scaffold for Fe−S Cluster Biosynthesis journal October 2001
Extrusion of iron-sulfide (Fe2S2* and Fe4S4*) cores from the active sites of ferredoxin proteins journal January 1975
Charting the travels of copper in eukaryotes from yeast to mammals journal September 2012
HscA and HscB Stimulate [2Fe-2S] Cluster Transfer from IscU to Apoferredoxin in an ATP-Dependent Reaction journal September 2006
Monothiol glutaredoxins and A-type proteins: partners in Fe–S cluster trafficking journal January 2013