Structure of PDB 3ia3 Chain B

Receptor sequence

>3ia3B (length=135) Species: 9606 (Homo sapiens)

LSPADKTNVKAAWGKVGAHAGEYGAEALERMFLSFPTTKTYFPHFDLSHG
SAQVKGHGKKVADALTNAVAHVDDMPNALSALSDLHAHKLRVDPVNFKLL
SHCLLVTLAAHLPAEFTPAVHASLDKFLASVSTVL

3D structure

• PDB: 3ia3 A cis-proline in alpha-hemoglobin stabilizing protein directs the structural reorganization of alpha-hemoglobin.
• Chain: B
• Resolution: 3.2 Å

Interaction with ligand

Site #	Ligand	Ligand chain	Binding residues on receptor (original residue number in PDB)	Binding residues on receptor (residue number reindexed from 1)	Binding affinity
BS01	HEM	B	F43 H45 F46 H58 K61 V62 L83 H87 L91 V93 N97 F98 L101 S102	F42 H44 F45 H57 K60 V61 L82 H86 L90 V92 N96 F97 L100 S101
BS02	HEM	B	M76 P77 N78	M75 P76 N77

Gene Ontology

Molecular Function

• GO:0004601 peroxidase activity
• GO:0005344 oxygen carrier activity
• GO:0005506 iron ion binding
• GO:0005515 protein binding
• GO:0019825 oxygen binding
• GO:0020037 heme binding
• GO:0031720 haptoglobin binding
• GO:0043177 organic acid binding
• GO:0046872 metal ion binding

Biological Process

• GO:0015670 carbon dioxide transport
• GO:0015671 oxygen transport
• GO:0030185 nitric oxide transport
• GO:0042542 response to hydrogen peroxide
• GO:0042744 hydrogen peroxide catabolic process
• GO:0098869 cellular oxidant detoxification

Cellular Component

• GO:0005576 extracellular region
• GO:0005615 extracellular space
• GO:0005829 cytosol
• GO:0005833 hemoglobin complex
• GO:0016020 membrane
• GO:0031838 haptoglobin-hemoglobin complex
• GO:0070062 extracellular exosome
• GO:0071682 endocytic vesicle lumen
• GO:0072562 blood microparticle

External links

• PDB: RCSB:3ia3, PDBe:3ia3, PDBj:3ia3
• PDBsum: 3ia3
• PubMed: 19706593
• UniProt: P69905|HBA_HUMAN Hemoglobin subunit alpha (Gene Name=HBA1)