Annotations: 2M5K

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B, C, D, E A, B, C, D, E, F, G, H	PF00576	HIUase/Transthyretin family (Transthyretin)	HIUase/Transthyretin family	This family includes transthyretin that is a thyroid hormone-binding protein that transports thyroxine from the bloodstream to the brain. However, most of the sequences listed in this family do not bind thyroid hormones. They are actually enzymes of ...	This family includes transthyretin that is a thyroid hormone-binding protein that transports thyroxine from the bloodstream to the brain. However, most of the sequences listed in this family do not bind thyroid hormones. They are actually enzymes of the purine catabolism that catalyse the conversion of 5-hydroxyisourate (HIU) to OHCU [2,3]. HIU hydrolysis is the original function of the family and is conserved from bacteria to mammals; transthyretins arose by gene duplications in the vertebrate lineage [4]. HIUases are distinguished in the alignment from the conserved C-terminal YRGS sequence.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B, C, D, E A, B, C, D, E, F, G, H	Transthyretin	hormone activity protein binding binding molecular function activator activity signaling receptor binding molecular function regulator activity signaling receptor regulator activity receptor ligand activity signaling receptor activator activity protein-containing complex binding thyroid hormone binding hormone binding identical protein binding	organonitrogen compound metabolic process purine nucleobase metabolic process primary metabolic process purine-containing compound metabolic process nucleobase-containing compound metabolic process organic cyclic compound metabolic process organic substance metabolic process nucleobase-containing small molecule metabolic process nucleobase metabolic process small molecule metabolic process metabolic process regulation of hormone levels organic hydroxy compound metabolic process cellular metabolic process organonitrogen compound metabolic process purine nucleobase metabolic process primary metabolic process purine-containing compound metabolic process nucleobase-containing compound metabolic process organic cyclic compound metabolic process organic substance metabolic process nucleobase-containing small molecule metabolic process nucleobase metabolic process small molecule metabolic process metabolic process regulation of hormone levels organic hydroxy compound metabolic process cellular metabolic process biological regulation hormone metabolic process cellular modified amino acid metabolic process thyroid hormone metabolic process phenol-containing compound metabolic process cellular process regulation of biological quality	extracellular region extracellular space cellular anatomical entity protein-containing complex

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B, C, D, E A, B, C, D, E, F, G, H	IPR036817	Transthyretin/hydroxyisourate hydrolase domain superfamily	Homologous Superfamily
A, B, C, D, E A, B, C, D, E, F, G, H	IPR023418	Transthyretin, thyroxine binding site	Binding Site
A, B, C, D, E A, B, C, D, E, F, G, H	IPR023419	Transthyretin, conserved site	Conserved Site
A, B, C, D, E A, B, C, D, E, F, G, H	IPR023416	Transthyretin/hydroxyisourate hydrolase domain	Domain
A, B, C, D, E A, B, C, D, E, F, G, H	IPR000895	Transthyretin/hydroxyisourate hydrolase	Family

RCSB PDB Core Operations are funded by the National Science Foundation (DBI-1832184), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM133198.