The ERRs are orphan
nuclear receptors
In the field of molecular biology, nuclear receptors are a class of proteins responsible for sensing steroids, thyroid hormones, vitamins, and certain other molecules. These receptors work with other proteins to regulate the expression of specif ...
, meaning the identity of their endogenous ligand has yet to be unambiguously determined. They are named because of
sequence homology
Sequence homology is the biological homology between DNA, RNA, or protein sequences, defined in terms of shared ancestry in the evolutionary history of life. Two segments of DNA can have shared ancestry because of three phenomena: either a spe ...
with estrogen receptors, but do not appear to bind estrogens or other tested steroid hormones.
There are three human
estrogen related receptors:
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ERRα
Estrogen-related receptor alpha (ERRα), also known as NR3B1 (nuclear receptor subfamily 3, group B, member 1), is a nuclear receptor that in humans is encoded by the ''ESRRA'' (Estrogen Related Receptor Alpha) gene. ERRα was originally cloned b ...
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ERRβ
Estrogen-related receptor beta (ERR-β), also known as ESRRB or NR3B2 (nuclear receptor subfamily 3, group B, member 2), is a nuclear receptor that in humans is encoded by the ''ESRRB'' (Estrogen Related Receptor Beta) gene
In biology, th ...
()
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ERRγ ()
ERRs bind enhancers throughout the genome where they exert effects on gene regulation. The ERR family exhibit varying transcriptional activation capabilities and physically interact with the transcriptional co-activators
PGC1-alpha and PGC1-beta,
via their AF-2 domains and the leucine-rich nuclear receptor interacting motifs (LxxLL) present in the PGC-1 proteins,
The ERR family have been demonstrated to control energy homeostasis,
oxidative metabolism,
and mitochondrial biogenesis,
while effecting mammalian physiology in the heart, brown adipose tissue, white adipose tissue, placenta,
macrophages,
and demonstrated additional roles in diabetes and
cancer.
The contributions of individual ERRs to physiology continue to be elucidated through the generation of sophisticated tissue-specific gene knockout mouse models.
References
External links
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{{Estrogen-related receptor modulators
Human female endocrine system
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