9BP6

Structure of alpha1B and betaI/IVb microtubule bound to GMPCPP

Replaces:  8V2I

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, I)	Tubulin alpha-1B chain	polymer	451	50204.4	2	UniProt (P68363) Pfam (PF00091) Pfam (PF03953)	Homo sapiens (human)	Alpha-tubulin ubiquitous,Tubulin K-alpha-1,Tubulin alpha-ubiquitous chain
2	B, D (B, Q)	Tubulin beta chain	polymer	444	49717.6	2	UniProt (P07437) Pfam (PF00091) Pfam (PF03953)	Homo sapiens (human)	Tubulin beta-5 chain
3	E, I (A, I)	GUANOSINE-5'-TRIPHOSPHATE	non-polymer		523.2	2	Chemie (GTP) PubChem (177679032) PubChem (135400627) PubChem (135487750) PubChem (136088935) PubChem (136803486) PubChem (135398633) PubChem (135544356) PubChem (135547949) PubChem (135600366) PubChem (135749822) PubChem (136005188) PubChem (136073923) PubChem (136240914) PubChem (136664747) PubChem (136772743) PubChem (136772744) PubChem (136803487) PubChem (137286749) PubChem (164715984) PubChem (171699466)
4	F, H, J, L (A, B, I, Q)	MAGNESIUM ION	non-polymer		24.3	4	Chemie (MG) PubChem (888)
5	G, K (B, Q)	PHOSPHOMETHYLPHOSPHONIC ACID GUANYLATE ESTER	non-polymer		521.2	2	Chemie (G2P)

Contents of the asymmetric unit

Polymers	Number of chains	4
	Total formula weight	199844.1
Non-Polymers*	Number of molecules	8
	Total formula weight	2186.0
All*	Total formula weight	202030.1

*Water molecules are not included.