1QKP

HIGH RESOLUTION X-RAY STRUCTURE OF AN EARLY INTERMEDIATE IN THE BACTERIORHODOPSIN PHOTOCYCLE

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A	BACTERIORHODOPSIN	polymer	248	26814.4	1	UniProt (P02945) Pfam (PF01036) In PDB	HALOBACTERIUM SALINARIUM
2	A	RETINAL	non-polymer		284.4	1	Chemie (RET)
3		water	water		18.0	27	Chemie (HOH)

Contents of the asymmetric unit

Polymers	Number of chains	1
	Total formula weight	26814.4
Non-Polymers*	Number of molecules	1
	Total formula weight	284.4
All*	Total formula weight	27098.8

*Water molecules are not included.