P07368 (LHB2_RHOCA) 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
LH-3B

Gene names

Name:

pucB

Organism

Rhodobacter capsulatus (Rhodopseudomonas capsulata)

Taxonomic identifier

1061 [NCBI]

Taxonomic lineage

cellular organisms › Bacteria › Proteobacteria › Alphaproteobacteria › Rhodobacterales › Rhodobacteraceae › Rhodobacter

Protein attributes

Sequence length	49 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
PTM	Formylation
Technical term	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 – 49	49	Light-harvesting protein B-800/850 beta chain		PRO_0000099823
Regions
	Topological domain	1 – 21	21	Cytoplasmic Potential
	Transmembrane	22 – 44	23	Helical; Potential
	Topological domain	45 – 49	5	Periplasmic Potential
Sites
	Metal binding	20	1	Magnesium (bacteriochlorophyll axial ligand) Potential
	Metal binding	38	1	Magnesium (bacteriochlorophyll axial ligand) Potential
Amino acid modifications
	Modified residue	1	1	N-formylmethionine; partial

Sequences

	Sequence		Length	Mass (Da)
	P07368 [UniParc]. Last modified July 1, 1989. Version 2. Checksum: 6CDDDE07B396211B	FASTA	49	5,155
	10 20 30 40 MTDDKAGPSG LSLKEAEEIH SYLIDGTRVF GAMALVAHIL SAIATPWLG

References

[1]	"Light-harvesting II (B800-B850 complex) structural genes from Rhodopseudomonas capsulata." Youvan D.C., Ismail S. Proc. Natl. Acad. Sci. U.S.A. 82:58-62(1985) [PubMed] [Europe PMC] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [GENOMIC DNA].
[2]	"Genes downstream from pucB and pucA are essential for formation of the B800-850 complex of Rhodobacter capsulatus." Tichy H.V., Oberle B., Stiehle H., Schiltz E., Drews G. J. Bacteriol. 171:4914-4922(1989) [PubMed] [Europe PMC] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [GENOMIC DNA].
[3]	"The complete amino-acid sequence of the small bacteriochlorophyll-binding polypeptide B800-850-beta from light-harvesting complex B800-850 of Rhodopseudomonas capsulata." Tadros M.H., Frank R., Drews G. FEBS Lett. 183:91-94(1985) Cited for: PROTEIN SEQUENCE, FORMYLATION AT MET-1.

Cross-references

Sequence databases
EMBL GenBank DDBJ	K02337 Genomic DNA. Translation: AAA26132.1. M28510 Genomic DNA. Translation: AAA26161.1.
PIR	LBRF8C. A21901.
3D structure databases
ProteinModelPortal	P07368.
SMR	P07368. Positions 11-48.
ModBase	Search...
Protocols and materials databases
StructuralBiologyKnowledgebase	Search...
Phylogenomic databases
HOGENOM	HOG000230332.
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...

Entry information

Entry name

LHB2_RHOCA

Accession

Primary (citable) accession number: P07368

Entry history

Integrated into UniProtKB/Swiss-Prot:	April 1, 1988
Last sequence update:	July 1, 1989
Last modified:	April 3, 2013
This is version 81 of the entry and version 2 of the sequence. [Complete history]

Entry status

Reviewed (UniProtKB/Swiss-Prot)

Annotation program

Prokaryotic Protein Annotation Program