Sandbox Reserved 1300
From Proteopedia
| Line 7: | Line 7: | ||
Steroid Hormone receptors overlook and control gene expression, the rate of cellular reproduction, and specialization in eukaryotes. The receptors do so by turning genes controlled by particular promoters on or off as steroid molecules (hormones) bind to them. Steroid hormone receptors therefore serve as transcription factors containing zinc fingers which are repeated structural units. | Steroid Hormone receptors overlook and control gene expression, the rate of cellular reproduction, and specialization in eukaryotes. The receptors do so by turning genes controlled by particular promoters on or off as steroid molecules (hormones) bind to them. Steroid hormone receptors therefore serve as transcription factors containing zinc fingers which are repeated structural units. | ||
| - | The estrogen receptor (ER) is found in the heat shock protein complex found in the nucleus. When the ligand binds to the ER, it undergoes a conformational change which displaces the heat shock protein complex allowing cofactors to bind and facilitate the | + | The estrogen receptor (ER) is found in the heat shock protein complex found in the nucleus. When the ligand binds to the ER, it undergoes a conformational change which displaces the heat shock protein complex allowing cofactors to bind and facilitate the receptor's interaction with desired genes. When the oestrogen ligand is present, the oestrogen receptor regulates gene expression by either recognizing and binding to the DNA palindromic estrogen response element sequence (ERE) or by interacting with other transcription factors. |
In terms of ligand-independent activity, the ER uses many different intracellular signalling pathways which use either the phosphorylation of the ER by protein kinases or regulation of the ER-bound cofactors to produce various cell and tissue specific oestrogenic responses. For example, the activation of the epidermal growth factor (EGF) receptor leads to ERπ phosphorylation through the mitogen-activated protein kinase (MAPK) pathway which enhances the ER interaction with the steroid receptor co activator, thereby affecting ligand binding. Feedback also occurs where oestrogen activates MAPK pathway which activates the ER and amplifies the pathway signal. | In terms of ligand-independent activity, the ER uses many different intracellular signalling pathways which use either the phosphorylation of the ER by protein kinases or regulation of the ER-bound cofactors to produce various cell and tissue specific oestrogenic responses. For example, the activation of the epidermal growth factor (EGF) receptor leads to ERπ phosphorylation through the mitogen-activated protein kinase (MAPK) pathway which enhances the ER interaction with the steroid receptor co activator, thereby affecting ligand binding. Feedback also occurs where oestrogen activates MAPK pathway which activates the ER and amplifies the pathway signal. | ||
== Interactions == | == Interactions == | ||
| - | Steroid hormone receptors regulate gene transcription through various interaction including binding to the hormone, binding to itself to form a homodimer, binding to its response element, or binding to other protein cofactors. Examples of ligand molecules for steroid hormone receptors include aldosterone, estrogen, the thyroid hormone T3, calcitriol, the active form of vitamin D, and retinol. | + | Steroid hormone receptors regulate gene transcription through various interaction including binding to the hormone, binding to itself to form a homodimer, binding to its response element, or binding to other protein cofactors. Examples of <scene name='75/751193/Ligands/1'>ligand</scene> molecules for steroid hormone receptors include aldosterone, estrogen, the thyroid hormone T3, calcitriol, the active form of vitamin D, and retinol. |
Revision as of 04:32, 16 February 2017
|
Contents |
Structure
The steroid hormone receptor has 3 major .
Function
Steroid Hormone receptors overlook and control gene expression, the rate of cellular reproduction, and specialization in eukaryotes. The receptors do so by turning genes controlled by particular promoters on or off as steroid molecules (hormones) bind to them. Steroid hormone receptors therefore serve as transcription factors containing zinc fingers which are repeated structural units.
The estrogen receptor (ER) is found in the heat shock protein complex found in the nucleus. When the ligand binds to the ER, it undergoes a conformational change which displaces the heat shock protein complex allowing cofactors to bind and facilitate the receptor's interaction with desired genes. When the oestrogen ligand is present, the oestrogen receptor regulates gene expression by either recognizing and binding to the DNA palindromic estrogen response element sequence (ERE) or by interacting with other transcription factors.
In terms of ligand-independent activity, the ER uses many different intracellular signalling pathways which use either the phosphorylation of the ER by protein kinases or regulation of the ER-bound cofactors to produce various cell and tissue specific oestrogenic responses. For example, the activation of the epidermal growth factor (EGF) receptor leads to ERπ phosphorylation through the mitogen-activated protein kinase (MAPK) pathway which enhances the ER interaction with the steroid receptor co activator, thereby affecting ligand binding. Feedback also occurs where oestrogen activates MAPK pathway which activates the ER and amplifies the pathway signal.
Interactions
Steroid hormone receptors regulate gene transcription through various interaction including binding to the hormone, binding to itself to form a homodimer, binding to its response element, or binding to other protein cofactors. Examples of molecules for steroid hormone receptors include aldosterone, estrogen, the thyroid hormone T3, calcitriol, the active form of vitamin D, and retinol.
Interaction Location
The receptors perform their interactions within the nucleus independent of the heat shock protein complex in order to control gene expression.
Origin
48 steroid hormone and nuclear receptor genes have been revealed in humans. The highly conserved DNA binding domains and the ligand binding domains indicate that the steroid hormone receptors share a common ancestral molecule.
This is a sample scene created with SAT to by Group, and another to make of the protein. You can make your own scenes on SAT starting from scratch or loading and editing one of these sample scenes.
</StructureSection>
