6WVR

Tubulin dimers from a 13-protofilament, Taxol stabilized microtubule

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A, C	Tubulin alpha-1B chain	polymer	451	50204.4	2	UniProt (P81947) Pfam (PF00091) Pfam (PF03953) In PDB	Bos taurus (Bovine)	Alpha-tubulin ubiquitous, Tubulin K-alpha-1, Tubulin alpha-ubiquitous chain
2	B, D	Tubulin beta chain	polymer	445	49953.8	2	UniProt (E1BJB1) Pfam (PF00091) Pfam (PF03953) UniProt (by SIFTS) (Q6B856) In PDB	Bos taurus (Bovine)
3	A, C	GUANOSINE-5'-TRIPHOSPHATE	non-polymer		523.2	2	Chemie (GTP)
4	A, C	MAGNESIUM ION	non-polymer		24.3	2	Chemie (MG)
5	B, D	GUANOSINE-5'-DIPHOSPHATE	non-polymer		443.2	2	Chemie (GDP)
6	B, D	TAXOL	non-polymer		853.9	2	Chemie (TA1)

Contents of the asymmetric unit

Polymers	Number of chains	4
	Total formula weight	200316.5
Non-Polymers*	Number of molecules	8
	Total formula weight	3689.2
All*	Total formula weight	204005.7

*Water molecules are not included.