2FKW: Light-harvesting protein B-800/850, alpha chain

Structure of LH2 from Rps. acidophila crystallized in lipidic mesophases. Determined by X-ray diffraction at 2.45 Å resolution. Released 28 Mar 2006.

Method: X-ray diffraction
Resolution: 2.45 Å
Organism: Rhodoblastus acidophilus
Chains: 18
Atoms: 9,829
Mol. weight: 129.6 kDa
Ligands: LDA, RG1, BCL
Released: 28 Mar 2006

Explore 2FKW in 3D Show helices and sheets RCSB PDB PDBe

Secondary structure: helices and β-sheets

2FKW contains 36 α-helices and 0 β-strands across 18 chains. Residue ranges use author residue numbering, as in the PDB file, from PDBe. To see them in 3D, choose the Cartoon representation with Secondary structure coloring: helices, sheets and coils get different colors.

Chains A, C, E, G, I, K, O and R: 3 helices, 0 β-strands

Element	Residues	Length
α-helix	6-8	3
α-helix	12-37	26
α-helix	40-46	7

Chains B, D, F, H, J, L, N, P and S: 1 helix, 0 β-strands

Element	Residues	Length	Sheet
α-helix	5-36	32

Chain M: 3 helices, 0 β-strands

Element	Residues	Length
α-helix	6-8	3
α-helix	12-36	25
α-helix	40-46	7

Molecules and chains

Molecule	Chains	Type	Length	Organism	UniProt
Light-harvesting protein B-800/850, alpha chain	A, C, E, G, I, K, M, O, R	protein	53	Rhodoblastus acidophilus	P26789 (AlphaFold model)
Light-harvesting protein B-800/850, beta chain	B, D, F, H, J, L, N, P, S	protein	41	Rhodoblastus acidophilus	P26790 (AlphaFold model)

Sequence of entity 1 (A, C, E, G, I, K, M, O, R), FASTA

>2FKW_1 Light-harvesting protein B-800/850, alpha chain (chains A, C, E, G, I, K, M, O, R)
MNQGKIWTVVNPAIGIPALLGSVTVIAILVHLAILSHTTWFPAYWQGGVKKAA

Sequence of entity 2 (B, D, F, H, J, L, N, P, S), FASTA

>2FKW_2 Light-harvesting protein B-800/850, beta chain (chains B, D, F, H, J, L, N, P, S)
ATLTAEQSEELHKYVIDGTRVFLGLALVAHFLAFSATPWLH

Ligands and cofactors

ID	Name	Formula	Copies
LDA	Lauryl dimethylamine-N-oxide	C14 H31 N O	27
RG1	Rhodopin b-D-glucoside	C46 H66 O6	9
BCL	Bacteriochlorophyll a	C55 H74 Mg N4 O6	27

Primary citation

Room to Move: Crystallizing Membrane Proteins in Swollen Lipidic Mesophases. Cherezov, V., Clogston, J., Papiz, M.Z. et al. J Mol Biol (2006) 357:1605-1618. DOI 10.1016/j.jmb.2006.01.049 · PubMed

Other PDB entries of the same protein (UniProt P26789 (AlphaFold model), which also has an AlphaFold model), best resolution first:

1NKZ 2.0 Å, Crystal structure of LH2 B800-850 from Rps. acidophila at 2.0 Angstrom resolution
9EK8 2.35 Å, Light Harvesting complex 2 (LH2), B800-B850, of Rhodoblastus (Rbl.) acidophilus strain…
1KZU 2.5 Å, Integral membrane peripheral light harvesting complex from rhodopseudomonas acidophila…

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