Macromolecule Annotations for the Entities in PDB 1QAB

Protein Family Annotation Pfam Database Homepage

Chains Pfam Accession Pfam Identifier Pfam Description Type Source
E PF00061 Lipocalin Lipocalin / cytosolic fatty-acid binding protein family Domain Lipocalins are transporters for small hydrophobic molecules, such as lipids, steroid hormones, bilins, and retinoids. The family also encompasses the enzyme prostaglandin D synthase (EC: Alignment subsumes both the lipocalin and fatty acid binding protein signatures from PROSITE. This is supported on structural and functional grounds. The structure is an eight-stranded beta barrel. PFAM PF00061
A PF00576 Transthyretin HIUase/Transthyretin family Domain 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. PFAM PF00576

Gene Product Annotation Gene Ontology Consortium Homepage

Chains Polymer Molecular Function Biological Process Cellular Component
A,B,C,D PROTEIN (transthyretin) (1QAB:A,B,C,D)
E,F PROTEIN (retinol binding protein) (1QAB:E,F)

Protein Modification Annotation

Type PDB Residue Nr. Description