5BXF

Apo FcRn Structure at pH 4.5

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A, C (A, C)	IgG receptor FcRn large subunit p51	polymer	300	33393.6	2	UniProt (P55899) Pfam (PF00129) Pfam (PF07654)	Homo sapiens (Human)	FcRn,IgG Fc fragment receptor transporter alpha chain,Neonatal Fc receptor
2	B, D (B, D)	Beta-2-microglobulin	polymer	119	13732.5	2	UniProt (P61769) Pfam (PF07654)	Homo sapiens (Human)
3	E (C)	water	water		18.0	1	Chemie (HOH)

Sequence modifications

A, C: -22 - 267 (UniProt: P55899)

PDB	External Database	Details
Val 268	-	expression tag
Asp 269	-	expression tag
His 270	-	expression tag
His 271	-	expression tag
His 272	-	expression tag
His 273	-	expression tag
His 274	-	expression tag
His 275	-	expression tag
Val 276	-	expression tag
Asp 277	-	expression tag

Contents of the asymmetric unit

Polymers	Number of chains	4
	Total formula weight	94252.3
All*	Total formula weight	94252.3

*Water molecules are not included.