https://wikimd.org/index.php?action=history&feed=atom&title=Pyrin_domainPyrin domain - Revision history2026-04-28T07:20:52ZRevision history for this page on the wikiMediaWiki 1.44.2https://wikimd.org/index.php?title=Pyrin_domain&diff=5658857&oldid=prevPrab: CSV import2024-04-24T22:29:00Z<p>CSV import</p>
<p><b>New page</b></p><div>[[File:PDB_1pn5_EBI.jpg|thumb]] [[File:2KM6NLRP7NMR.png|left|thumb]] [[File:AIM2sidetopdown.png|left|thumb]] '''Pyrin domain''' (also known as '''PYD''') is a protein domain found in a range of [[protein]]s involved in the regulation of [[inflammatory]] processes and [[apoptosis]]. The domain is named after the [[protein]] Pyrin, which was first identified in patients with [[Familial Mediterranean Fever]] (FMF), a hereditary [[inflammatory disorder]]. The Pyrin domain is critical for protein-protein interactions, particularly in the formation of inflammasomes, which are multi-protein complexes that play a key role in the immune system's response to infection and cellular damage.<br />
<br />
==Structure and Function==<br />
The Pyrin domain consists of approximately 90 amino acids and is characterized by a six-helix bundle fold. This structural motif facilitates the homotypic interaction between Pyrin domains of different proteins, enabling the assembly of inflammasome complexes. Through these interactions, Pyrin domain-containing proteins can regulate the activation of [[caspase-1]], an enzyme essential for the maturation of pro-inflammatory cytokines such as [[interleukin-1β]] (IL-1β) and interleukin-18 (IL-18).<br />
<br />
==Role in Disease==<br />
Mutations in the Pyrin domain or in Pyrin domain-containing proteins are associated with several autoinflammatory diseases. The most well-known of these is Familial Mediterranean Fever, where mutations in the MEFV gene, which encodes the Pyrin protein, lead to uncontrolled inflammation. Other diseases linked to mutations in Pyrin domain-containing proteins include Cryopyrin-associated periodic syndromes (CAPS) and Pyogenic arthritis, Pyoderma gangrenosum, and Acne (PAPA) syndrome. These conditions are characterized by episodes of fever, rash, joint pain, and other inflammatory symptoms.<br />
<br />
==Inflammasome Activation==<br />
The Pyrin domain plays a crucial role in the activation of the inflammasome, particularly the NLRP3 inflammasome. Upon detection of pathogen-associated molecular patterns (PAMPs) or damage-associated molecular patterns (DAMPs), Pyrin domain-containing proteins can oligomerize and recruit [[apoptosis]]-associated speck-like protein containing a CARD (ASC) through Pyrin-Pyrin domain interactions. This recruitment then leads to the assembly of the inflammasome complex, culminating in caspase-1 activation, cytokine maturation, and in some cases, a form of cell death known as pyroptosis.<br />
<br />
==Research and Therapeutics==<br />
Understanding the molecular mechanisms by which the Pyrin domain and Pyrin domain-containing proteins regulate inflammation and apoptosis has significant implications for the development of new therapeutic strategies. Inhibitors targeting specific components of the inflammasome pathway, including Pyrin domain-containing proteins, are being explored as potential treatments for autoinflammatory diseases, as well as conditions with an inflammatory component, such as [[atherosclerosis]], [[Alzheimer's disease]], and [[type 2 diabetes]].<br />
<br />
[[Category:Protein domains]]<br />
[[Category:Immunology]]<br />
[[Category:Cell biology]]<br />
<br />
{{stub}}</div>Prab