ABA3	cysteine desulfurase enzyme encoded by the ABA3 gene (ABSCISIC ACID3). The enzyme is required for sulfuration of Moco in aldehyde oxidases and xanthine dehydrogenases. Aldehyde oxidase 3 carries out the final step in the biosynthesis of abscisic acid, an important plant hormone.
ABC	ATP-binding cassette
ABCB7	ATP-binding cassette transporter, B group, number 7
ACO	aconitase
AO	aldehyde oxidase
At	as prefix to gene and protein names, meaning Arabidopsis thaliana
Atm1	ATP-binding cassette (ABC) transporter of the mitochondria in Saccharomyces cerevisiae
ATM3	ATP-binding cassette (ABC) transporter of the mitochondria in Arabidopsis thaliana
ATR1, ATR2 or ATR3	Arabidopsis thaliana P450 reductase
CFD1	cytosolic Fe–S cluster deficient
CIA genes	genes identified based on their requirement for the assembly of Fe–S clusters on cytosolic and nuclear proteins, but not on mitochondrial Fe–S proteins
CIA pathway	cytosolic iron–sulfur protein assembly pathway
CIAPIN1	cytokine-induced apoptosis inhibitor 1; human homologue of DRE2
CpNifS	chloroplast NifS-like (nitrogenase fixation S-like) protein, the cysteine desulfurase enzyme localized in chloroplasts
CxxC	cysteine-x-x-cysteine amino acid sequence, with x denoting any amino acid
DRE2	Fe–S binding protein encoded by the DRE2 gene, derepressed for ribosomal protein S14 expression
EPR	electron paramagnetic resonance
Fe–S	iron–sulfur
Gal	galactose; in this text used as an abbreviation for galactose-inducible promoter
GFP	green fluorescent protein
HEAT repeat	tandemly repeated, 37–47 amino acid long-module occurring in a number of cytoplasmic proteins, including the four name-giving proteins huntingtin, elongation factor 3, alpha regulatory subunit of protein phosphatase 2A and TOR1
isc gene cluster	cluster of seven genes in bacteria required for iron–sulfur cluster assembly
ISC pathway	iron–sulfur cluster (assembly) pathway
ISCS	human homologue of the bacterial IscS protein, a type-I cysteine desulfurase
MET25	yeast gene involved in methionine synthesis. The promoter is used in this study to drive constitutive expression of transgenes
Moco	molybdenum cofactor
NFS1	NifS-like gene encoding a cysteine desulfurase
NFU2	NifU-like protein 2
NP	natural promoter
Sc	as prefix to gene and protein names, meaning Saccharomyces cerevisiae
SiR	sulfite reductase
sir3-3	sirtinol resistant allele 3–3 (not to be confused with sulfite reductase!)
suf operon	bacterial operon of six genes involved in sulfur mobilization for the biosynthesis of Fe–S clusters under oxidative stress and iron limitation.
SUF pathway	sulfur mobilization pathway
TAH18	gene that was first identified in a mutant screen for Top1T722A Hypersensitivity.
TDH	yeast gene encoding a Triose-phosphate DeHydrogenase. The promoter is used in this study to drive the expression of transgenes at very high levels.
T-DNA	transfer DNA; large segment of DNA transferred by Agrobacterium into the plant genome
WT	wild-type
XDH	xanthine dehydrogenase