3UG9

Crystal Structure of the Closed State of Channelrhodopsin

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A (A)	Archaeal-type opsin 1, Archaeal-type opsin 2	polymer	333	37442.0	1	UniProt (Q93WP2) UniProt (Q8RUT8) Pfam (PF01036)	Chlamydomonas reinhardtii	Channelopsin-1, Chlamyopsin 4 light-gated ion channel, Retinal binding protein, Sensory opsin B
2	B (A)	RETINAL	non-polymer		284.4	1	Chemie (RET)
3	C, D, E, F, G... (A)	OLEIC ACID	non-polymer		282.5	6	Chemie (OLA)
4	I (A)	water	water		18.0	43	Chemie (HOH)

Sequence modifications

A: 24 - 245 (UniProt: Q93WP2)
A: 246 - 348 (UniProt: Q8RUT8)

PDB	External Database	Details
Ser 349	-	expression tag
Ser 350	-	expression tag
Glu 351	-	expression tag
Asp 352	-	expression tag
Leu 353	-	expression tag
Tyr 354	-	expression tag
Phe 355	-	expression tag
Gln 356	-	expression tag

Contents of the asymmetric unit

Polymers	Number of chains	1
	Total formula weight	37442.0
Non-Polymers*	Number of molecules	7
	Total formula weight	1979.2
All*	Total formula weight	39421.2

*Water molecules are not included.