P26790 (LHB5_RHOAC) Reviewed, UniProtKB/Swiss-Prot

Names and origin

Protein names	Recommended name: Light-harvesting protein B-800/850 beta chain Alternative name(s): Antenna pigment protein beta chain
Organism	Rhodopseudomonas acidophila (Rhodoblastus acidophilus)
Taxonomic identifier	1074 [NCBI]
Taxonomic lineage	cellular organisms › Bacteria › Proteobacteria › Alphaproteobacteria › Rhizobiales › Bradyrhizobiaceae › Rhodoblastus

Protein attributes

Sequence length	41 AA.
Sequence status	Complete.
Protein existence	Evidence at protein level

General annotation (Comments)

Function	Antenna complexes are light-harvesting systems, which transfer the excitation energy to the reaction centers.
Subunit structure	The core complex is formed by different alpha and beta chains, binding bacteriochlorophyll molecules, and arranged most probably in tetrameric structures disposed around the reaction center. The non-pigmented gamma chains may constitute additional components.
Subcellular location	Cell inner membrane; Single-pass type II membrane protein.
Sequence similarities	Belongs to the antena complex beta subunit family.

Ontologies

Keywords
Cellular component	Antenna complex Cell inner membrane Cell membrane Membrane
Domain	Transmembrane Transmembrane helix
Ligand	Bacteriochlorophyll Chlorophyll Chromophore Magnesium Metal-binding
Molecular function	Light-harvesting polypeptide
Technical term	3D-structure Direct protein sequencing
Gene Ontology (GO)
Biological_process	photosynthesis, light reaction Inferred from electronic annotation. Source: InterPro protein-chromophore linkage Inferred from electronic annotation. Source: UniProtKB-KW
Cellular_component	integral to membrane Inferred from electronic annotation. Source: UniProtKB-KW plasma membrane Inferred from electronic annotation. Source: UniProtKB-SubCell plasma membrane light-harvesting complex Inferred from electronic annotation. Source: InterPro
Molecular_function	bacteriochlorophyll binding Inferred from electronic annotation. Source: UniProtKB-KW electron transporter, transferring electrons within the cyclic electron transport pathway of photosynthesis activity Inferred from electronic annotation. Source: InterPro metal ion binding Inferred from electronic annotation. Source: UniProtKB-KW
Complete GO annotation...

Sequence annotation (Features)

Feature key

Position(s)

Length

Description

Graphical view

Feature identifier

Molecule processing

Chain

1 – 41

41

Light-harvesting protein B-800/850 beta chain

PRO_0000099819

Regions

Topological domain

1 – 14

14

Cytoplasmic

Transmembrane

15 – 36

22

Helical

Topological domain

37 – 41

5

Periplasmic

Sites

Metal binding

12

1

Magnesium (bacteriochlorophyll axial ligand) Potential

Metal binding

30

1

Magnesium (bacteriochlorophyll axial ligand) Potential

Secondary structure

1

.

.

.

41

Helix Strand Turn

Details...

Helix

5 – 36

32

Sequences

	Sequence		Length	Mass (Da)
	P26790 [UniParc]. Last modified August 1, 1992. Version 1. Checksum: 60782AF6EA54CFD4	FASTA	41	4,554
	10 20 30 40 ATLTAEQSEE LHKYVIDGTR VFLGLALVAH FLAFSATPWL H

References

[1]	"The complete amino acid sequences of the B800-850 antenna polypeptides from Rhodopseudomonas acidophila strain 7750." Bissig I., Brunisholz R.A., Suter F., Cogdell R.J., Zuber H. Z. Naturforsch. C 43:77-83(1988) [PubMed] [Europe PMC] [Abstract] Cited for: PROTEIN SEQUENCE. Strain: DSM 141 / 7750 / LMG 4302.
[2]	Brunisholz R.A., Bissig I., Niederer E., Suter F., Zuber H. (In) Biggins J. (eds.); Progress in photosynthesis research, pp.II.1:13-16, Martinus Nijhoff, The Hague (1987) Cited for: PROTEIN SEQUENCE. Strain: DSM 141 / 7750 / LMG 4302.
[3]	"Apoprotein structure in the LH2 complex from Rhodopseudomonas acidophila strain 10050: modular assembly and protein pigment interactions." Prince S.M., Papiz M.Z., Freer A.A., McDermott G., Hawthornthwaite-Lawless A.M., Cogdell R.J., Isaacs N.W. J. Mol. Biol. 268:412-423(1997) [PubMed] [Europe PMC] [Abstract] Cited for: X-RAY CRYSTALLOGRAPHY (2.5 ANGSTROMS). Strain: 10050.
+	Additional computationally mapped references.

Cross-references

Sequence databases

PIR

S07673.

3D structure databases

PDBe
RCSB PDB
PDBj

Entry	Method	Resolution (Å)	Chain	Positions	PDBsum
1KZU	X-ray	2.50	B/E/H	1-41	[»]
1NKZ	X-ray	2.00	B/D/F	1-41	[»]
2FKW	X-ray	2.45	B/D/F/H/J/L/N/P/S	1-41	[»]

ProteinModelPortal

P26790.

SMR

P26790. Positions 1-41.

ModBase

Search...

Protocols and materials databases

StructuralBiologyKnowledgebase

Search...

Family and domain databases

InterPro

IPR000066. Antenna_a/b.
IPR002362. Antenna_beta.
IPR023623. Antenna_beta_CS.
[Graphical view]

Pfam

PF00556. LHC. 1 hit.
[Graphical view]

PIRSF

PIRSF002900. Antenna_beta. 1 hit.

PRINTS

PR00674. LIGHTHARVSTB.

SUPFAM

SSF56918. Antenna_a/b. 1 hit.

PROSITE

PS00969. ANTENNA_COMP_BETA. 1 hit.
[Graphical view]

ProtoNet

Search...

Other

EvolutionaryTrace

P26790.

Entry information

Entry name

LHB5_RHOAC

Accession

Primary (citable) accession number: P26790

Entry history

Integrated into UniProtKB/Swiss-Prot:	August 1, 1992
Last sequence update:	August 1, 1992
Last modified:	April 3, 2013
This is version 80 of the entry and version 1 of the sequence. [Complete history]

Entry status

Reviewed (UniProtKB/Swiss-Prot)

Annotation program

Prokaryotic Protein Annotation Program