Summary: Androgen receptor
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Androgen receptor Edit Wikipedia article
|, AIS, 8, DHTR, HUMA, HYSP1, KD, NR3C4, SBMA, SMAX1, TFM|
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crystal structure of the human androgen receptor ligand binding domain bound with an androgen receptor nh2-terminal peptide, ar20-30, and r1881
The androgen receptor (AR), also known as NR3C4 (nuclear receptor subfamily 3, group C, member 4), is a type of nuclear receptor that is activated by binding either of the androgenic hormones, testosterone, or dihydrotestosterone  in the cytoplasm and then translocating into the nucleus. The androgen receptor is most closely related to the progesterone receptor, and progestins in higher dosages can block the androgen receptor.
The main function of the androgen receptor is as a DNA-binding transcription factor that regulates gene expression; however, the androgen receptor has other functions as well. Androgen regulated genes are critical for the development and maintenance of the male sexual phenotype.
- 1 Function
- 2 Genetics
- 3 Structure
- 4 As a drug target
- 5 Interactions
- 6 See also
- 7 References
- 8 External links
Effect on development
In some cell types, testosterone interacts directly with androgen receptors, whereas, in others, testosterone is converted by 5-alpha-reductase to dihydrotestosterone, an even more potent agonist for androgen receptor activation. Testosterone appears to be the primary androgen receptor-activating hormone in the Wolffian duct, whereas dihydrotestosterone is the main androgenic hormone in the urogenital sinus, urogenital tubercle, and hair follicles. Hence, testosterone is responsible primarily for the development of male primary sexual characteristics, whereas dihydrotestosterone is responsible for secondary male characteristics.
Androgens cause slow epiphysis, or maturation of the bones, but more of the potent epiphysis effect comes from the estrogen produced by aromatization of androgens. Steroid users of teen age may find that their growth had been stunted by androgen and/or estrogen excess. People with too little sex hormones can be short during puberty but end up taller as adults as in androgen insensitivity syndrome or estrogen insensitivity syndrome.
Also, AR knockout-mice studies have shown that AR is essential for normal female fertility, being required for development and full functionality of the ovarian follicles and ovulation, working through both intra-ovarian and neuroendocrine mechanisms.
Maintenance of male skeletal integrity
Via the Androgen receptor, androgens play a key role in the maintenance of male skeletal integrity. The regulation of this integrity by androgen receptor (AR) signaling can be attributed to both osteoblasts and osteocytes.
Mechanism of action
The primary mechanism of action for androgen receptors is direct regulation of gene transcription. The binding of an androgen to the androgen receptor results in a conformational change in the receptor that, in turn, causes dissociation of heat shock proteins, transport from the cytosol into the cell nucleus, and dimerization. The androgen receptor dimer binds to a specific sequence of DNA known as a hormone response element. Androgen receptors interact with other proteins in the nucleus, resulting in up- or down-regulation of specific gene transcription. Up-regulation or activation of transcription results in increased synthesis of messenger RNA, which, in turn, is translated by ribosomes to produce specific proteins. One of the known target genes of androgen receptor activation is the insulin-like growth factor I receptor (IGF-1R). Thus, changes in levels of specific proteins in cells is one way that androgen receptors control cell behavior.
One function of androgen receptor that is independent of direct binding to its target DNA sequence, is facilitated by recruitment via other DNA-binding proteins. One example is serum response factor, a protein that activates several genes that cause muscle growth.
Androgen receptor is modified by acetylation, which directly promotes contact independent growth of prostate cancer cells.
More recently, androgen receptors have been shown to have a second mode of action. As has been also found for other steroid hormone receptors such as estrogen receptors, androgen receptors can have actions that are independent of their interactions with DNA. Androgen receptors interact with certain signal transduction proteins in the cytoplasm. Androgen binding to cytoplasmic androgen receptors can cause rapid changes in cell function independent of changes in gene transcription, such as changes in ion transport. Regulation of signal transduction pathways by cytoplasmic androgen receptors can indirectly lead to changes in gene transcription, for example, by leading to phosphorylation of other transcription factors.
The androgen insensitivity syndrome, formerly known as testicular feminization, is caused by a mutation of the androgen receptor gene located on the X chromosome (locus:Xq11-Xq12). The androgen receptor seems to affect neuron physiology and is defective in Kennedy's disease. In addition, point mutations and trinucleotide repeat polymorphisms has been linked to a number of additional disorders.
- AR-A - 87 kDa - N-terminus truncated (lacks the first 187 amino acids), which results from in vitro proteolysis.
- AR-B - 110 kDa - full length
- A/B) - N-terminal regulatory domain contains:
- activation function 1 (AF-1) between residues 101 and 370 required for full ligand activated transcriptional activity
- activation function 5 (AF-5) between residues 360-485 is responsible for the constitutive activity (activity without bound ligand)
- dimerization surface involving residues 1-36 (containing the FXXLF motif where F = phenylalanine, L = leucine, and X = any amino acid residue) and 370-494, both of which interact with the LBD in an intramolecular head-to-tail interaction
- C) - DNA binding domain (DBD)
- D) - Hinge region - flexible region that connects the DBD with the LBD; along with the DBD, contains a ligand dependent nuclear localization signal
- E) - Ligand binding domain (LBD) containing
- F) - C-terminal domain
As a drug target
AR antagonists: flutamide, nilutamide, bicalutamide, enzalutamide, apalutamide, cyproterone acetate, megestrol acetate, chlormadinone acetate, spironolactone, canrenone, drospirenone, ketoconazole, topilutamide (fluridil), cimetidine.
Androgen receptor has been shown to interact with:
- Calmodulin 1,
- Caveolin 1,
- CREB-binding protein,
- Cyclin D1,
- Cyclin-dependent kinase 7,
- Death associated protein 6,
- Epidermal growth factor receptor,
- Retinoblastoma protein,
- Small heterodimer partner,
- Testicular receptor 2,
- Testicular receptor 4,
- UXT, and
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|Wikimedia Commons has media related to Androgen receptor.|
- GeneReviews/NCBI/NIH/UW entry on Androgen Insensitivity Syndrome
- OMIM entries on Androgen Insensitivity Syndrome
- GeneReviews/NIH/NCBI/UW entry on Spinal and Bulbar Muscular Atrophy, Kennedy's Disease, SBMA, X-Linked Spinal and Bulbar Muscular Atrophy
- OMIM entries on Spinal and Bulbar Muscular Atrophy, Kennedy's Disease, SBMA, X-Linked Spinal and Bulbar Muscular Atrophy
- Androgen Receptors at the US National Library of Medicine Medical Subject Headings (MeSH)
- Brinkmann AO. "Androgen physiology: receptor and metabolic disorders" (PDF). In Robert McLachlan, editor. Endocrinology of Male Reproduction. Endotext.org. Retrieved 2008-04-29.
- Gottlieb B (2007-07-24). "The Androgen Receptor Gene Mutations Database Server". McGill University. Archived from the original on 22 April 2008. Retrieved 2008-04-29.
- Thompson J (2006-09-30). "Molecular Mechanisms of Androgen Receptor Interactions" (PDF). Helsinki University Biomedical Dissertations No. 80. University of Helsinki. Archived (PDF) from the original on 6 April 2008. Retrieved 2008-04-29.
This tab holds the annotation information that is stored in the Pfam database. As we move to using Wikipedia as our main source of annotation, the contents of this tab will be gradually replaced by the Wikipedia tab.
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This tab holds annotation information from the InterPro database.
InterPro entry IPR001103
Steroid or nuclear hormone receptors (NRs) constitute an important super-family of transcription regulators that are involved in diverse physiological functions, including control of embryonic development, cell differentiation and homeostasis. Members include the steroid hormone receptors and receptors for thyroid hormone, retinoids and 1,25-dihydroxy-vitamin D3. The proteins function as dimeric molecules in the nucleus to regulate the transcription of target genes in a ligand-responsive manner [PUBMED:7899080, PUBMED:8165128].
NRs are extremely important in medical research, a large number of them being implicated in diseases such as cancer, diabetes and hormone resistance syndromes. Many do not yet have a defined ligand and are accordingly termed "orphan" receptors. More than 300 NRs have been described to date and a new system has recently been introduced in an attempt to rationalise the increasingly complex set of names used to describe superfamily members.
The androgen receptor (AR) consists of 3 functional and structural domains: an N-terminal (modulatory) domain; a DNA binding domain (INTERPRO) that mediates specific binding to target DNA sequences (ligand-responsive elements); and a hormone binding domain. The N-terminal domain (NTD) is unique to the androgen receptors and spans approximately the first 530 residues; the highly-conserved DNA-binding domain is smaller (around 65 residues) and occupies the central portion of the protein; and the hormone ligand binding domain (LBD) lies at the receptor C terminus. In the absence of ligand, steroid hormone receptors are thought to be weakly associated with nuclear components; hormone binding greatly increases receptor affinity.
The LBDs of steroid hormone receptors fold into 12 helices that form a ligand-binding pocket. When an agonist is bound, helix 12 folds over the pocket to enclose the ligand [PUBMED:12089231]. When an antagonist is unbound, helix 12 is positioned away from the pocket in a way that interferes with the binding of coactivators to a groove in the hormone-binding domain formed after ligand binding. In AR, ligand binding that induces folding of helix 12 to overlie the pocket discloses a groove that binds a region of the NTD. Coactivator molecules can also bind to this groove, but the predominant site for coactivator binding to AR is in the NTD. AR ligand resides in a pocket and primarily contacts helices 4, 5, and 10. The DNA-binding region includes eight cysteine residues that form two coordination complexes, each composed of four cysteines and a Zn2+ ion. These two zinc fingers form the structure that binds to the major groove of DNA. The second zinc finger stabilises the binding complex by hydrophobic interactions with the first finger and contributes to specificity of receptor DNA binding. It is also necessary for receptor dimerisation that occurs during DNA binding
Defects in the androgen receptor cause testicular feminisation syndrome, androgen insensibility syndrome (AIS) [PUBMED:1307250, PUBMED:1569163]. AIS may be complete (CAIS), where external genitalia are phenotypically female; partial (PAIS), where genitalia are substantively ambiguous; or mild (MAIS), where external genitalia are normal male, or nearly so. Defects in the receptor also cause X-linked spinal and bulbar muscular atrophy (also known as Kennedy's disease).
The mapping between Pfam and Gene Ontology is provided by InterPro. If you use this data please cite InterPro.
|Cellular component||nucleus (GO:0005634)|
|Molecular function||DNA binding (GO:0003677)|
|androgen receptor activity (GO:0004882)|
|steroid binding (GO:0005496)|
|Biological process||regulation of transcription, DNA-templated (GO:0006355)|
|androgen receptor signaling pathway (GO:0030521)|
Below is a listing of the unique domain organisations or architectures in which this domain is found. More...
The graphic that is shown by default represents the longest sequence with a given architecture. Each row contains the following information:
- the number of sequences which exhibit this architecture
a textual description of the architecture, e.g. Gla, EGF x 2, Trypsin.
This example describes an architecture with one
Gladomain, followed by two consecutive
EGFdomains, and finally a single
- a link to the page in the Pfam site showing information about the sequence that the graphic describes
- the UniProt description of the protein sequence
- the number of residues in the sequence
- the Pfam graphic itself.
Note that you can see the family page for a particular domain by clicking on the graphic. You can also choose to see all sequences which have a given architecture by clicking on the Show link in each row.
Finally, because some families can be found in a very large number of architectures, we load only the first fifty architectures by default. If you want to see more architectures, click the button at the bottom of the page to load the next set.
Loading domain graphics...
We store a range of different sequence alignments for families. As well as the seed alignment from which the family is built, we provide the full alignment, generated by searching the sequence database (reference proteomes) using the family HMM. We also generate alignments using four representative proteomes (RP) sets, the UniProtKB sequence database, the NCBI sequence database, and our metagenomics sequence database. More...
There are various ways to view or download the sequence alignments that we store. We provide several sequence viewers and a plain-text Stockholm-format file for download.
We make a range of alignments for each Pfam-A family:
- the curated alignment from which the HMM for the family is built
- the alignment generated by searching the sequence database using the HMM
- Representative Proteomes (RPs) at 15%, 35%, 55% and 75% co-membership thresholds
- alignment generated by searching the UniProtKB sequence database using the family HMM
- alignment generated by searching the NCBI sequence database using the family HMM
- alignment generated by searching the metagenomics sequence database using the family HMM
You can see the alignments as HTML or in three different sequence viewers:
- a Java applet developed at the University of Dundee. You will need Java installed before running jalview
- an HTML page showing the whole alignment.Please note: full Pfam alignments can be very large. These HTML views are extremely large and often cause problems for browsers. Please use either jalview or the Pfam viewer if you have trouble viewing the HTML version
- an HTML-based representation of the alignment, coloured according to the posterior-probability (PP) values from the HMM. As for the standard HTML view, heatmap alignments can also be very large and slow to render.
You can download (or view in your browser) a text representation of a Pfam alignment in various formats:
You can also change the order in which sequences are listed in the alignment, change how insertions are represented, alter the characters that are used to represent gaps in sequences and, finally, choose whether to download the alignment or to view it in your browser directly.
You may find that large alignments cause problems for the viewers and the reformatting tool, so we also provide all alignments in Stockholm format. You can download either the plain text alignment, or a gzipped version of it.
We make a range of alignments for each Pfam-A family. You can see a description of each above. You can view these alignments in various ways but please note that some types of alignment are never generated while others may not be available for all families, most commonly because the alignments are too large to handle.
1Cannot generate PP/Heatmap alignments for seeds; no PP data available
Key: available, not generated, — not available.
Format an alignment
We make all of our alignments available in Stockholm format. You can download them here as raw, plain text files or as gzip-compressed files.
You can also download a FASTA format file containing the full-length sequences for all sequences in the full alignment.
HMM logos is one way of visualising profile HMMs. Logos provide a quick overview of the properties of an HMM in a graphical form. You can see a more detailed description of HMM logos and find out how you can interpret them here. More...
If you find these logos useful in your own work, please consider citing the following article:
This page displays the phylogenetic tree for this family's seed alignment. We use FastTree to calculate neighbour join trees with a local bootstrap based on 100 resamples (shown next to the tree nodes). FastTree calculates approximately-maximum-likelihood phylogenetic trees from our seed alignment.
Note: You can also download the data file for the tree.
Curation and family details
This section shows the detailed information about the Pfam family. You can see the definitions of many of the terms in this section in the glossary and a fuller explanation of the scoring system that we use in the scores section of the help pages.
|Author:||Mian N, Bateman A|
|Number in seed:||2|
|Number in full:||66|
|Average length of the domain:||320.60 aa|
|Average identity of full alignment:||62 %|
|Average coverage of the sequence by the domain:||48.19 %|
|HMM build commands:||
build method: hmmbuild -o /dev/null HMM SEED
search method: hmmsearch -Z 11927849 -E 1000 --cpu 4 HMM pfamseq
|Family (HMM) version:||13|
|Download:||download the raw HMM for this family|
Weight segments by...
Change the size of the sunburst
selected sequences to HMM
a FASTA-format file
- 0 sequences
- 0 species
This visualisation provides a simple graphical representation of the distribution of this family across species. You can find the original interactive tree in the More....
This chart is a modified "sunburst" visualisation of the species tree for this family. It shows each node in the tree as a separate arc, arranged radially with the superkingdoms at the centre and the species arrayed around the outermost ring.
How the sunburst is generated
The tree is built by considering the taxonomic lineage of each sequence that has a match to this family. For each node in the resulting tree, we draw an arc in the sunburst. The radius of the arc, its distance from the root node at the centre of the sunburst, shows the taxonomic level ("superkingdom", "kingdom", etc). The length of the arc represents either the number of sequences represented at a given level, or the number of species that are found beneath the node in the tree. The weighting scheme can be changed using the sunburst controls.
In order to reduce the complexity of the representation, we reduce the number of taxonomic levels that we show. We consider only the following eight major taxonomic levels:
Colouring and labels
Segments of the tree are coloured approximately according to their superkingdom. For example, archeal branches are coloured with shades of orange, eukaryotes in shades of purple, etc. The colour assignments are shown under the sunburst controls. Where space allows, the name of the taxonomic level will be written on the arc itself.
As you move your mouse across the sunburst, the current node will be highlighted. In the top section of the controls panel we show a summary of the lineage of the currently highlighed node. If you pause over an arc, a tooltip will be shown, giving the name of the taxonomic level in the title and a summary of the number of sequences and species below that node in the tree.
Anomalies in the taxonomy tree
There are some situations that the sunburst tree cannot easily handle and for which we have work-arounds in place.
Missing taxonomic levels
Some species in the taxonomic tree may not have one or more of the main eight levels that we display. For example, Bos taurus is not assigned an order in the NCBI taxonomic tree. In such cases we mark the omitted level with, for example, "No order", in both the tooltip and the lineage summary.
Unmapped species names
The tree is built by looking at each sequence in the full alignment for the family. We take the name of the species given by UniProt and try to map that to the full taxonomic tree from NCBI. In some cases, the name chosen by UniProt does not map to any node in the NCBI tree, perhaps because the chosen name is listed as a synonym or a misspelling in the NCBI taxonomy.
So that these nodes are not simply omitted from the sunburst tree, we group them together in a separate branch (or segment of the sunburst tree). Since we cannot determine the lineage for these unmapped species, we show all levels between the superkingdom and the species as "uncategorised".
Since we reduce the species tree to only the eight main taxonomic levels, sequences that are mapped to the sub-species level in the tree would not normally be shown. Rather than leave out these species, we map them instead to their parent species. So, for example, for sequences belonging to one of the Vibrio cholerae sub-species in the NCBI taxonomy, we show them instead as belonging to the species Vibrio cholerae.
Too many species/sequences
For large species trees, you may see blank regions in the outer layers of the sunburst. These occur when there are large numbers of arcs to be drawn in a small space. If an arc is less than approximately one pixel wide, it will not be drawn and the space will be left blank. You may still be able to get some information about the species in that region by moving your mouse across the area, but since each arc will be very small, it will be difficult to accurately locate a particular species.
The tree shows the occurrence of this domain across different species. More...
We show the species tree in one of two ways. For smaller trees we try to show an interactive representation, which allows you to select specific nodes in the tree and view them as an alignment or as a set of Pfam domain graphics.
Unfortunately we have found that there are problems viewing the interactive tree when the it becomes larger than a certain limit. Furthermore, we have found that Internet Explorer can become unresponsive when viewing some trees, regardless of their size. We therefore show a text representation of the species tree when the size is above a certain limit or if you are using Internet Explorer to view the site.
If you are using IE you can still load the interactive tree by clicking the "Generate interactive tree" button, but please be aware of the potential problems that the interactive species tree can cause.
For all of the domain matches in a full alignment, we count the number that are found on all sequences in the alignment. This total is shown in the purple box.
We also count the number of unique sequences on which each domain is found, which is shown in green. Note that a domain may appear multiple times on the same sequence, leading to the difference between these two numbers.
Finally, we group sequences from the same organism according to the NCBI code that is assigned by UniProt, allowing us to count the number of distinct sequences on which the domain is found. This value is shown in the pink boxes.
We use the NCBI species tree to group organisms according to their taxonomy and this forms the structure of the displayed tree. Note that in some cases the trees are too large (have too many nodes) to allow us to build an interactive tree, but in most cases you can still view the tree in a plain text, non-interactive representation. Those species which are represented in the seed alignment for this domain are highlighted.
You can use the tree controls to manipulate how the interactive tree is displayed:
- show/hide the summary boxes
- highlight species that are represented in the seed alignment
- expand/collapse the tree or expand it to a given depth
- select a sub-tree or a set of species within the tree and view them graphically or as an alignment
- save a plain text representation of the tree
Please note: for large trees this can take some time. While the tree is loading, you can safely switch away from this tab but if you browse away from the family page entirely, the tree will not be loaded.
There is 1 interaction for this family. More...
We determine these interactions using iPfam, which considers the interactions between residues in three-dimensional protein structures and maps those interactions back to Pfam families. You can find more information about the iPfam algorithm in the journal article that accompanies the website.
For those sequences which have a structure in the Protein DataBank, we use the mapping between UniProt, PDB and Pfam coordinate systems from the PDBe group, to allow us to map Pfam domains onto UniProt sequences and three-dimensional protein structures. The table below shows the structures on which the Androgen_recep domain has been found. There are 5 instances of this domain found in the PDB. Note that there may be multiple copies of the domain in a single PDB structure, since many structures contain multiple copies of the same protein seqence.
Loading structure mapping...