4KC3

Cytokine/receptor binary complex

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A	Interleukin-33	polymer	159	18155.9	1	UniProt (O95760) Pfam (PF15095) In PDB	Homo sapiens (human)	IL-33, Interleukin-1 family member 11, IL-1F11, Nuclear factor from high endothelial venules, NF-HEV
2	B	Interleukin-1 receptor-like 1	polymer	309	35056.5	1	UniProt (Q01638) Pfam (PF07679) In PDB	Homo sapiens (human)	Protein ST2
3	B	2-acetamido-2-deoxy-beta-D-glucopyranose	non-polymer		221.2	3	Chemie (NAG)

Sequence modifications

B: 19 - 321 (UniProt: Q01638)

PDB	External Database	Details
His 322	-	expression tag
His 323	-	expression tag
His 324	-	expression tag
His 325	-	expression tag
His 326	-	expression tag
His 327	-	expression tag

Contents of the asymmetric unit

Polymers	Number of chains	2
	Total formula weight	53212.4
Non-Polymers*	Number of molecules	3
	Total formula weight	663.6
All*	Total formula weight	53876.0

*Water molecules are not included.