scholarly journals Two Iron-Responsive Promoter Elements Control Expression of FOX1 in Chlamydomonas reinhardtii

2007 ◽  
Vol 6 (11) ◽  
pp. 2163-2167 ◽  
Author(s):  
Xiaodong Deng ◽  
Mats Eriksson
Keyword(s):  
Iron Deficiency ◽  
Chlamydomonas Reinhardtii ◽  
Iron Uptake ◽  
Uptake System ◽  
Promoter Elements ◽  
High Affinity ◽  
Iron Uptake System ◽  
Iron Responsive Elements

ABSTRACT FOX1 encodes an iron deficiency-induced ferroxidase involved in a high-affinity iron uptake system. Mutagenesis analysis of the FOX1 promoter identified two separate iron-responsive elements, FeRE1 (CACACG) and FeRE2 (CACGCG), between positions −87 and −82 and between positions −65 and −60, respectively, and both are needed for induced FOX1 expression under conditions of iron deficiency.

scholarly journals Yeast protective response to arsenate involves the repression of the high affinity iron uptake system

2013 ◽  
Vol 1833 (5) ◽  
pp. 997-1005 ◽  
Author(s):  
Liliana Batista-Nascimento ◽  
Michel B. Toledano ◽  
Dennis J. Thiele ◽  
Claudina Rodrigues-Pousada
Keyword(s):  
Iron Uptake ◽  
Uptake System ◽  
Protective Response ◽  
High Affinity ◽  
Iron Uptake System

scholarly journals Dual Regulation of the Arabidopsis High-Affinity Root Iron Uptake System by Local and Long-Distance Signals

2003 ◽  
Vol 132 (2) ◽  
pp. 796-804 ◽  
Author(s):  
Grégory A. Vert ◽  
Jean-François Briat ◽  
Catherine Curie
Keyword(s):  
Iron Uptake ◽  
Uptake System ◽  
Long Distance ◽  
High Affinity ◽  
Iron Uptake System

Cloning of Pichia pastoris Fet3: Insights into the High Affinity Iron Uptake System

2001 ◽  
Vol 392 (1) ◽  
pp. 162-167 ◽  
Author(s):  
Maria Paola Paronetto ◽  
Rossella Miele ◽  
Antonella Maugliani ◽  
Marina Borro ◽  
Maria Carmela Bonaccorsi di Patti
Keyword(s):  
Pichia Pastoris ◽  
Iron Uptake ◽  
Uptake System ◽  
High Affinity ◽  
Iron Uptake System

scholarly journals Biosynthesis and Uptake of Siderophores Is Controlled by the PacC-Mediated Ambient-pH Regulatory System in Aspergillus nidulans

2004 ◽  
Vol 3 (2) ◽  
pp. 561-563 ◽  
Author(s):  
Martin Eisendle ◽  
Harald Oberegger ◽  
Rudolf Buttinger ◽  
Paul Illmer ◽  
Hubertus Haas
Keyword(s):  
Aspergillus Nidulans ◽  
Iron Uptake ◽  
Regulatory System ◽  
Transcriptional Regulator ◽  
Uptake System ◽  
Iron Availability ◽  
High Affinity ◽  
Iron Uptake System

ABSTRACT Biosynthesis and uptake of siderophores in Aspergillus nidulans are regulated not only by iron availability but also by ambient pH: expression of this high-affinity iron uptake system is elevated by an increase in the ambient pH. Mediation of this regulation by the transcriptional regulator PacC has been confirmed via acidity- and alkalinity-mimicking mutants.

scholarly journals Iron restriction and the growth ofSalmonella enteritidis

1993 ◽  
Vol 110 (1) ◽  
pp. 41-47 ◽  
Author(s):  
H. Chart ◽  
B. Rowe
Keyword(s):  
Iron Uptake ◽  
Salmonella Enteritidis ◽  
Outer Membrane Proteins ◽  
Phage Type ◽  
Iron Chelator ◽  
Virulence Plasmid ◽  
Uptake System ◽  
Iron Restriction ◽  
High Affinity ◽  
Iron Uptake System

SUMMARYStrains ofSalmonella enteritidiswere examined for their ability to remove ferricions from the iron chelating agents ovotransferrin, Desferal and EDDA. Growth ofS. enteritidisphage type (PT) 4 (SE4) in trypticase soy broth containing ovotransferrin resulted in the expression of iron regulated outer membrane proteins (OMPs) of 74. 78 and 81 kDa. and unexpectedly the repression of expression of OMP C. The 38 MDa ‘mouse virulence’ plasmid was not required for the expression of the iron-regulated OMPs (IROMPs). SE4 was able to obtain iron bound to the iron chelator Desferal and EDDA without expressing a high-affinity iron uptake system. Strains ofS. enteritidisbelonging to PTs 7. 8, 13a, 23. 24 and 30 were also able to remove ferric ions from Desferal and EDDA without expressing a high-affinity iron uptake system. We conclude that strains of SE4 possess a high-affinity iron sequestering mechanism that can readily remove iron from ovotransferrin. It is likely that iron limitation, and not iron restriction, is responsible for the bacteriostatic properties of fresh egg whites.

scholarly journals Evidence thatYersinia ruckeripossesses a high affinity iron uptake system

1991 ◽  
Vol 80 (2-3) ◽  
pp. 121-126 ◽  
Author(s):  
Jesús L. Romalde ◽  
Ramón F. Conchas ◽  
Alicia E. Toranzo
Keyword(s):  
Iron Uptake ◽  
Uptake System ◽  
High Affinity ◽  
Iron Uptake System

Arabidopsis IRT2 cooperates with the high-affinity iron uptake system to maintain iron homeostasis in root epidermal cells

Planta ◽  
2009 ◽  
Vol 229 (6) ◽  
pp. 1171-1179 ◽  
Author(s):  
Grégory Vert ◽  
Marie Barberon ◽  
Enric Zelazny ◽  
Mathilde Séguéla ◽  
Jean-François Briat ◽  
...  
Keyword(s):  
Iron Uptake ◽  
Iron Homeostasis ◽  
Epidermal Cells ◽  
Uptake System ◽  
High Affinity ◽  
Iron Uptake System

scholarly journals FEA1, FEA2, and FRE1, Encoding Two Homologous Secreted Proteins and a Candidate Ferrireductase, Are Expressed Coordinately with FOX1 and FTR1 in Iron-Deficient Chlamydomonas reinhardtii

2007 ◽  
Vol 6 (10) ◽  
pp. 1841-1852 ◽  
Author(s):  
Michael D. Allen ◽  
José A. del Campo ◽  
Janette Kropat ◽  
Sabeeha S. Merchant
Keyword(s):  
Iron Deficiency ◽  
Chlamydomonas Reinhardtii ◽  
Iron Uptake ◽  
Secreted Proteins ◽  
Nutrition Status ◽  
Iron Nutrition ◽  
High Affinity ◽  
Iron Deficient ◽  
Zip Family ◽  
Iron Assimilation

ABSTRACT Previously, we had identified FOX1 and FTR1 as iron deficiency-inducible components of a high-affinity copper-dependent iron uptake pathway in Chlamydomonas. In this work, we survey the version 3.0 draft genome to identify a ferrireductase, FRE1, and two ZIP family proteins, IRT1 and IRT2, as candidate ferrous transporters based on their increased expression in iron-deficient versus iron-replete cells. In a parallel proteomic approach, we identified FEA1 and FEA2 as the major proteins secreted by iron-deficient Chlamydomonas reinhardtii. The recovery of FEA1 and FEA2 from the medium of Chlamydomonas strain CC425 cultures is strictly correlated with iron nutrition status, and the accumulation of the corresponding mRNAs parallels that of the Chlamydomonas FOX1 and FTR1 mRNAs, although the magnitude of regulation is more dramatic for the FEA genes. Like the FOX1 and FTR1 genes, the FEA genes do not respond to copper, zinc, or manganese deficiency. The 5′ flanking untranscribed sequences from the FEA1, FTR1, and FOX1 genes confer iron deficiency-dependent expression of ARS2, suggesting that the iron assimilation pathway is under transcriptional control by iron nutrition. Genetic analysis suggests that the secreted proteins FEA1 and FEA2 facilitate high-affinity iron uptake, perhaps by concentrating iron in the vicinity of the cell. Homologues of FEA1 and FRE1 were identified previously as high-CO2-responsive genes, HCR1 and HCR2, in Chlorococcum littorale, suggesting that components of the iron assimilation pathway are responsive to carbon nutrition. These iron response components are placed in a proposed iron assimilation pathway for Chlamydomonas.

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