8QX5

Helical Carotenoid Protein 4 (HCP4) from Anabaena with bound Canthaxanthin

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A, B (A, B)	Orange carotenoid-binding domain-containing protein	polymer	177	19444.0	2	UniProt (Q8YMJ2) Pfam (PF09150)	Cyanobacteriota (blue-green algae)
2	C, D (A, B)	beta,beta-carotene-4,4'-dione	non-polymer		564.8	2	Chemie (45D)
3	E, F (A, B)	water	water		18.0	186	Chemie (HOH)

Sequence modifications

A, B: 3 - 171 (UniProt: Q8YMJ2)

PDB	External Database	Details
Met 1	-	initiating methionine
Gly 2	-	expression tag
His 172	-	expression tag
His 173	-	expression tag
His 174	-	expression tag
His 175	-	expression tag
His 176	-	expression tag
His 177	-	expression tag

Contents of the asymmetric unit

Polymers	Number of chains	2
	Total formula weight	38888.1
Non-Polymers*	Number of molecules	2
	Total formula weight	1129.7
All*	Total formula weight	40017.7

*Water molecules are not included.