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)
4	F, H, J, L (A, B, I, Q)	MAGNESIUM ION	non-polymer		24.3	4	Chemie (MG)
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.