scholarly journals Sensing mechanisms of iron-sulfur cluster regulatory proteins elucidated using native mass spectrometry

2021 ◽  
Author(s):  
Jason C Crack ◽  
Elizabeth Gray ◽  
Nick Le Brun
Keyword(s):  
Mass Spectrometry ◽  
Native Mass Spectrometry ◽  
Regulatory Proteins ◽  
Environmental Cues ◽  
Iron Sulfur Cluster ◽  
Sulfur Cluster ◽  
Iron Sulfur ◽  
Sense And Respond

The ability to sense and respond to various key environmental cues is important for the survival and adaptability of many bacteria, including pathogens. The particular sensitivity of iron-sulfur (Fe-S) clusters...

scholarly journals Multiple Sense and Antisense Promoters Contribute to the Regulated Expression of the isc-suf Operon for Iron-Sulfur Cluster Assembly in Rhodobacter

2019 ◽  
Vol 7 (12) ◽  
pp. 671 ◽  
Author(s):  
Xin Nie ◽  
Bernhard Remes ◽  
Gabriele Klug
Keyword(s):  
Rhodobacter Sphaeroides ◽  
Photosynthetic Electron Transport ◽  
Regulatory Proteins ◽  
Cluster Assembly ◽  
Iron Sulfur Cluster ◽  
Iron Sulfur Clusters ◽  
Sulfur Cluster ◽  
Iron Sulfur ◽  
Photosynthetic Complexes ◽  
The One

A multitude of biological functions relies on iron-sulfur clusters. The formation of photosynthetic complexes goes along with an additional demand for iron-sulfur clusters for bacteriochlorophyll synthesis and photosynthetic electron transport. However, photooxidative stress leads to the destruction of iron-sulfur clusters, and the released iron promotes the formation of further reactive oxygen species. A balanced regulation of iron-sulfur cluster synthesis is required to guarantee the supply of this cofactor, on the one hand, but also to limit stress, on the other hand. The phototrophic alpha-proteobacterium Rhodobacter sphaeroides harbors a large operon for iron-sulfur cluster assembly comprising the iscRS and suf genes. IscR (iron-sulfur cluster regulator) is an iron-dependent regulator of isc-suf genes and other genes with a role in iron metabolism. We applied reporter gene fusions to identify promoters of the isc-suf operon and studied their activity alone or in combination under different conditions. Gel-retardation assays showed the binding of regulatory proteins to individual promoters. Our results demonstrated that several promoters in a sense and antisense direction influenced isc-suf expression and the binding of the IscR, Irr, and OxyR regulatory proteins to individual promoters. These findings demonstrated a complex regulatory network of several promoters and regulatory proteins that helped to adjust iron-sulfur cluster assembly to changing conditions in Rhodobacter sphaeroides.

scholarly journals Bacterial iron–sulfur cluster sensors in mammalian pathogens

Metallomics ◽  
2015 ◽  
Vol 7 (6) ◽  
pp. 943-956 ◽  
Author(s):  
Halie K. Miller ◽  
Victoria Auerbuch
Keyword(s):  
Gene Expression ◽  
Bacterial Pathogenesis ◽  
Environmental Cues ◽  
Iron Sulfur Cluster ◽  
Control Of Gene Expression ◽  
Sulfur Cluster ◽  
Iron Sulfur

We review how iron–sulfur cluster-containing regulators contribute to bacterial pathogenesis through control of gene expression in response to environmental cues.

scholarly journals An Iron-Sulfur Cluster in the C-terminal Domain of the p58 Subunit of Human DNA Primase

2007 ◽  
Vol 282 (46) ◽  
pp. 33444-33451 ◽  
Author(s):  
Brian E. Weiner ◽  
Hao Huang ◽  
Brian M. Dattilo ◽  
Mark J. Nilges ◽  
Ellen Fanning ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Dna Replication ◽  
Enzymatic Activity ◽  
Limited Proteolysis ◽  
High Potential ◽  
Multiple Sequence ◽  
Iron Sulfur Cluster ◽  
Sulfur Cluster ◽  
Dna Primase ◽  
Iron Sulfur

DNA primase synthesizes short RNA primers that are required to initiate DNA synthesis on the parental template strands during DNA replication. Eukaryotic primase contains two subunits, p48 and p58, and is normally tightly associated with DNA polymerase α. Despite the fundamental importance of primase in DNA replication, structural data on eukaryotic DNA primase are lacking. The p48/p58 dimer was subjected to limited proteolysis, which produced two stable structural domains: one containing the bulk of p48 and the other corresponding to the C-terminal fragment of p58. These domains were identified by mass spectrometry and N-terminal sequencing. The C-terminal p58 domain (p58C) was expressed, purified, and characterized. CD and NMR spectroscopy experiments demonstrated that p58C forms a well folded structure. The protein has a distinctive brownish color, and evidence from inductively coupled plasma mass spectrometry, UV-visible spectrophotometry, and EPR spectroscopy revealed characteristics consistent with the presence of a [4Fe-4S] high potential iron protein cluster. Four putative cysteine ligands were identified using a multiple sequence alignment, and substitution of just one was sufficient to cause loss of the iron-sulfur cluster and a reduction in primase enzymatic activity relative to the wild-type protein. The discovery of an iron-sulfur cluster in DNA primase that contributes to enzymatic activity provides the first suggestion that the DNA replication machinery may have redox-sensitive activities. Our results offer new horizons in which to investigate the function of high potential [4Fe-4S] clusters in DNA-processing machinery.

Observation of the Iron-Sulfur Cluster inEscherichiacoliBiotin Synthase by Nanoflow Electrospray Mass Spectrometry

2001 ◽  
Vol 73 (17) ◽  
pp. 4154-4161 ◽  
Author(s):  
H. Hernández ◽  
K. S. Hewitson ◽  
P. Roach ◽  
N. M. Shaw ◽  
J. E. Baldwin ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Electrospray Mass Spectrometry ◽  
Iron Sulfur Cluster ◽  
Sulfur Cluster ◽  
Iron Sulfur
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