4MRM

Crystal structure of the extracellular domain of human GABA(B) receptor bound to the antagonist phaclofen

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A (A)	Gamma-aminobutyric acid type B receptor subunit 1	polymer	420	47645.6	1	UniProt (Q9UBS5) Pfam (PF01094)	Homo sapiens (human)	GABA-B receptor 1, GABA-B-R1, GABA-BR1, GABABR1, Gb1
2	B (B)	Gamma-aminobutyric acid type B receptor subunit 2	polymer	433	49127.5	1	UniProt (O75899) Pfam (PF01094)	Homo sapiens (human)	GABA-B receptor 2, GABA-B-R2, GABA-BR2, GABABR2, Gb2, G-protein coupled receptor 51, HG20
3	C (C)	beta-D-mannopyranose-(1-3)-alpha-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose	branched		748.7	1	In PDB GlyTouCan (G24199JF)
4	D (D)	2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose	branched		424.4	1	In PDB GlyTouCan (G42666HT)
5	E (A)	phaclofen	non-polymer		249.6	1	Chemie (2BY)
6	F (A)	2-acetamido-2-deoxy-beta-D-glucopyranose	non-polymer		221.2	1	Chemie (NAG)
7	G, H (A, B)	water	water		18.0	186	Chemie (HOH)

Sequence modifications

A: 48 - 459 (UniProt: Q9UBS5)

PDB	External Database	Details
Asp 460	-	expression tag
Tyr 461	-	expression tag
Lys 462	-	expression tag
Asp 463	-	expression tag
Asp 464	-	expression tag
Asp 465	-	expression tag
Asp 466	-	expression tag
Lys 467	-	expression tag

B: 42 - 466 (UniProt: O75899)

PDB	External Database	Details
Asp 467	-	expression tag
Tyr 468	-	expression tag
Lys 469	-	expression tag
Asp 470	-	expression tag
Asp 471	-	expression tag
Asp 472	-	expression tag
Asp 473	-	expression tag
Lys 474	-	expression tag

Contents of the asymmetric unit

Polymers	Number of chains	2
	Total formula weight	96773.1
Branched	Number of molecules	2
	Total formula weight	1173.1
Non-Polymers*	Number of molecules	2
	Total formula weight	470.8
All*	Total formula weight	98417.1

*Water molecules are not included.