In this work, we characterize genes in Mycobacterium tuberculosis that are regulated by IdeR (iron-dependent regulator), an iron-responsive DNA-binding protein of the DtxR family that has been shown to regulate iron acquisition in Mycobacterium smegmatis. To identify some of the genes that constitute the IdeR regulon, we searched the M. tuberculosis genome for promoter regions containing the co...

The iron-dependent regulator IdeR is a key transcriptional regulator of iron uptake in Mycobacterium tuberculosis. In order to increase our insight into the role of the SH3-like third domain of this essential regulator, the metal-binding and DNA-binding properties of two-domain IdeR (2D-IdeR) whose SH3-like domain has been truncated were characterized. The equilibrium dissociation constants for...

The iron-dependent regulator (IdeR) is a 230-amino acid transcriptional repressor that regulates iron homeostasis, oxidative stress response and virulence in Mycobacterium tuberculosis. The natural ligand for IdeR is Fe(II), but Ni(II), Co(II), Cd(II), Mn(II), and Zn(II) also bind to and activate the protein in vitro. Protein activation by metal is a complex process involving metal-induced fold...

Isochromosome of the long arm of the derivative chromosome 17, originating from the translocation t(15;17) [ider(17)(q10)t(15;17) or ider(17q)] in acute promyelocytic leukemia (APL), is a rare chromosome aberration which has been associated with a poor prognosis. In the present study, we report on 4 male APL patients with ider(17q) and review the clinical, cytogenetic and molecular characterist...

The mycobacterial IdeR protein is a metal-dependent regulator of the DtxR (diphtheria toxin repressor) family. In the presence of iron, it binds to a specific DNA sequence in the promoter regions of the genes that it regulates, thus controlling their transcription. In this study, we provide evidence that ideR is an essential gene in Mycobacterium tuberculosis. ideR cannot normally be disrupted ...

The iron-dependent regulator (IdeR) is a metal ion-activated transcriptional repressor that regulates the expression of genes encoding proteins involved in iron uptake to maintain metal-ion homeostasis. IdeR is a functional homologue of the diphtheria toxin repressor (DtxR), and both belong to the DtxR/MntR family of metalloregulators. The structure of Fe(2+)-bound IdeR (TA0872) from Themoplasm...

Exochelin is the primary extracellular siderophore of Mycobacterium smegmatis, and the iron-regulated fxbA gene encodes a putative formyltransferase, an essential enzyme in the exochelin biosynthetic pathway (E. H. Fiss, Y. Yu, and W. R. Jacobs, Jr., Mol. Microbiol. 14:557-569, 1994). We investigated the regulation of fxbA by the mycobacterial IdeR, a homolog of the Corynebacterium diphtheriae ...

Metalloproteins form a major class of enzymes in the living system that are involved in crucial biological functions such as catalysis, redox reactions and as 'switches' in signal transductions. Iron dependent repressor (IdeR) is a metal-sensing transcription factor that regulates free iron concentration in Mycobacterium tuberculosis. IdeR is also known to promote bacterial virulence, making it...

The iron-dependent regulator (IdeR) protein in Mycobacterium tuberculosis, and its better characterized homologue, the diphtheria toxin repressor (DtxR) from Corynebacterium diphtheriae, are iron-dependent regulatory proteins that control gene expression in response to iron availability in bacteria. IdeR regulates several genes required for iron uptake and storage including those involved in th...

We present a rare case of microgranular variant acute promyelocytic leukemia (APL) associated with ider(17)(q10)t(15;17)(q22;q12) of an old-age patient. The initial chromosome study showed a 46,XX,del(6)(?q21q25),der(15)t(15;17)(q22;q12),ider(17)(q10)t(15;17)[10]/47,sl,+ider(17)(q10)t(15;17)[3]/46,XX[16]. FISH signals from a dual color dual fusion translocation PML-RARA probe were consistent wi...