Search results for FTH1

Showing 11 results out of 11

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Species

Types

Compartments

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Protein (5 results from a total of 5)

Identifier: R-HSA-434212
Species: Homo sapiens
Compartment: cytosol
Primary external reference: UniProt: FTH1: P02794
Identifier: R-HSA-6801531
Species: Homo sapiens
Compartment: ficolin-1-rich granule lumen
Primary external reference: UniProt: FTH1: P02794
Identifier: R-HSA-2187212
Species: Homo sapiens
Compartment: extracellular region
Primary external reference: UniProt: FTH1: P02794
Identifier: R-HSA-6801508
Species: Homo sapiens
Compartment: tertiary granule lumen
Primary external reference: UniProt: FTH1: P02794
Identifier: R-HSA-2299670
Species: Homo sapiens
Compartment: endocytic vesicle lumen
Primary external reference: UniProt: FTH1: P02794

RNA Sequence (1 results from a total of 1)

Identifier: R-HSA-5690896
Species: Homo sapiens
Compartment: cytosol
Primary external reference: ENSEMBL: ENSEMBL:ENST00000273550

Interactor (1 results from a total of 1)

Identifier: Q6NZ44
Species: Homo sapiens
Primary external reference: UniProt: Q6NZ44

Set (2 results from a total of 2)

Identifier: R-HSA-5690884
Species: Homo sapiens
Compartment: cytosol
Identifier: R-HSA-434356
Species: Homo sapiens
Compartment: cytosol

Complex (1 results from a total of 1)

Identifier: R-HSA-5690882
Species: Homo sapiens
Compartment: cytosol

Reaction (1 results from a total of 1)

Identifier: R-HSA-5690886
Species: Homo sapiens
Compartment: cytosol
Iron and citrate are essential for the metabolism of most organisms so their regulation is critical for normal physiology and survival. Depending on cellular conditions, cytoplasmic aconitate hydratase (ACO1 aka iron regulatory protein 1, IRP1) can assume two different functions. During iron scarcity or oxidative stress, ACO1 functions as IRP1, binding to iron responsive elements (IREs) to modulate the translation of iron metabolism genes. In iron-rich conditions, IRP1 binds an iron-sulfur cluster (4Fe-4S) to function as a cytosolic aconitase. This functional duality of IRP1 connects the translational control of iron metabolising proteins to cellular iron levels.

During iron scarcity, ACO1 and iron-responsive element-binding protein 2 (IREB2) bind with high affinity to RNA stem-loops known as iron-responsive elements (IREs) present in the 5' untranslated region of the mRNAs of ferritin (composed of heavy and light subunits, FTH1 and FTL) and the erythroid form of aminolevulinic acid synthase (ALAD) and in the 3' untranslated region of the mRNA of the transferrin receptor (TFRC). Binding of ACO1 or IREB2 prevents translation of FTH1:FTL and ALAD and protects the mRNA of TFRC from degradation. ACO1 and IREB2 perform an important metabolic function in response to low intracellular iron levels by interacting with iron protein mRNAs to increase net iron uptake (via TFRC) and decrease sequestration (via FT) and utilisation (via ALAD) of iron (Kaptain et al. 1991, Philpott et al. 1994, Samaniego et al. 1994).

Glutaredoxin-3 (GLRX3) is essential for both transcriptional iron regulation and intracellular iron distribution. Silencing of human Grx3 expression in HeLa cells decreases the activities of several cytosolic Fe-S proteins, for example, iron-regulatory protein 1 (ACO1), a major component of posttranscriptional iron regulation. As a consequence, Grx3-depleted cells show decreased levels of ferritin and increased levels of transferrin receptor, features characteristic of cellular iron starvation (Haunhorst et al. 2013).
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