2UUM

Crystal structure of C-phycocyanin from Phormidium, Lyngbya spp. (Marine) and Spirulina sp. (Fresh water) shows two different ways of energy transfer between two hexamers.

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A, C, E, G, I...	C-PHYCOCYANIN ALPHA CHAIN	polymer	162	17602.8	12	UniProt (P72509) Pfam (PF00502) In PDB	SPIRULINA SP.
2	B, D, F, H, J...	C-PHYCOCYANIN BETA CHAIN	polymer	172	18080.5	11	UniProt (P72508) Pfam (PF00502) In PDB	SPIRULINA SP.
3	X	C-PHYCOCYANIN BETA CHAIN	polymer	172	18152.6	1	UniProt (P72508) Pfam (PF00502) In PDB	SPIRULINA SP.
4	C, U, E, W, G...	PHYCOCYANOBILIN	non-polymer		588.7	12	Chemie (CYC)
5	B, T, D, V, F...	BILIVERDINE IX ALPHA	non-polymer		582.6	24	Chemie (BLA)
6		water	water		18.0	163	Chemie (HOH)

Sequence modifications

A, C, E, G, I, K, M, O, Q, S, U, W: 1 - 162 (UniProt: P72509)

PDB	External Database	Details
Val 11	Ile 11	conflict
Val 148	Thr 148	conflict

B, D, F, H, J, L, N, P, R, T, V: 1 - 172 (UniProt: P72508)

PDB	External Database	Details
Val 40	Ala 40	conflict
Thr 77	Arg 77	conflict

X: 1 - 172 (UniProt: P72508)

PDB	External Database	Details
Val 40	Ala 40	conflict
Thr 77	Arg 77	conflict
Lys 132	Gly 132	conflict

Contents of the asymmetric unit

Polymers	Number of chains	24
	Total formula weight	428271.9
Non-Polymers*	Number of molecules	36
	Total formula weight	21047.8
All*	Total formula weight	449319.8

*Water molecules are not included.