Q3J1A3 (LHB1_RHOS4) Reviewed, UniProtKB/Swiss-Prot

Names and origin

Protein names

Recommended name:
Light-harvesting protein B-875 beta chain

Alternative name(s):
Antenna pigment protein beta chain
LH-3A

Gene names

Name:	pufB
Ordered Locus Names:	RHOS4_18630
ORF Names:	RSP_6108

Organism

Rhodobacter sphaeroides (strain ATCC 17023 / 2.4.1 / NCIB 8253 / DSM 158) [Reference proteome] [HAMAP]

Taxonomic identifier

272943 [NCBI]

Taxonomic lineage

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

Protein attributes

Sequence length	49 AA.
Sequence status	Complete.
Sequence processing	The displayed sequence is further processed into a mature form.
Protein existence	Inferred from homology

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	Signal-anchor Transmembrane Transmembrane helix
Ligand	Bacteriochlorophyll Chlorophyll Chromophore Magnesium Metal-binding
Molecular function	Light-harvesting polypeptide
Technical term	Complete proteome Reference proteome
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
	Initiator methionine	1	1	Removed By similarity
	Chain	2 – 49	48	Light-harvesting protein B-875 beta chain		PRO_0000099834
Regions
	Topological domain	2 – 27	26	Cytoplasmic By similarity
	Transmembrane	28 – 45	18	Helical; Signal-anchor for type II membrane protein; By similarity
	Topological domain	46 – 49	4	Periplasmic By similarity
Sites
	Metal binding	21	1	Magnesium (bacteriochlorophyll axial ligand) By similarity
	Metal binding	39	1	Magnesium (bacteriochlorophyll axial ligand) By similarity

Sequences

	Sequence		Length	Mass (Da)
	Q3J1A3 [UniParc]. Last modified January 23, 2007. Version 3. Checksum: 8C5B2F707B557582	FASTA	49	5,588
	10 20 30 40 MADKSDLGYT GLTDEQAQEL HSVYMSGLWL FSAVAIVAHL AVYIWRPWF

References

	« Hide 'large scale' referencesShow 'large scale' references »
[1]	"DNA sequence and in vitro expression of the B875 light-harvesting polypeptides of Rhodobacter sphaeroides." Kiley P.J., Donohue T.J., Havelka W.A., Kaplan S. J. Bacteriol. 169:742-750(1987) [PubMed] [Europe PMC] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [GENOMIC DNA].
[2]	"DNA sequence analysis of the photosynthesis region of Rhodobacter sphaeroides 2.4.1." Choudhary M., Kaplan S. Nucleic Acids Res. 28:862-867(2000) [PubMed] [Europe PMC] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [GENOMIC DNA].
[3]	"Complete sequence of chromosome 1 of Rhodobacter sphaeroides 2.4.1." Copeland A., Lucas S., Lapidus A., Barry K., Detter J.C., Glavina T., Hammon N., Israni S., Pitluck S., Richardson P., Mackenzie C., Choudhary M., Larimer F., Hauser L.J., Land M., Donohue T.J., Kaplan S. Submitted (SEP-2005) to the EMBL/GenBank/DDBJ databases Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA]. Strain: ATCC 17023 / 2.4.1 / NCIB 8253 / DSM 158.

Cross-references

Sequence databases
EMBL GenBank DDBJ	M15105 Genomic DNA. Translation: AAA26166.1. AF195122 Genomic DNA. Translation: AAF24302.1. CP000143 Genomic DNA. Translation: ABA79431.1.
PIR	LBRFAS. B27760.
RefSeq	YP_353332.1. NC_007493.1.
3D structure databases
ProteinModelPortal	Q3J1A3.
SMR	Q3J1A3. Positions 2-49.
ModBase	Search...
Protein-protein interaction databases
STRING	272943.RSP_6108.
Protocols and materials databases
StructuralBiologyKnowledgebase	Search...
Genome annotation databases
GeneID	3719401.
KEGG	rsp:RSP_6108.
PATRIC	23153654. VBIRhoSph57909_2202.
Phylogenomic databases
eggNOG	NOG84229.
HOGENOM	HOG000230332.
KO	K08927.
ProtClustDB	CLSK940828.
Enzyme and pathway databases
BioCyc	RSPH272943:GJAS-1915-MONOMER.
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

LHB1_RHOS4

Accession

Primary (citable) accession number: Q3J1A3
Secondary accession number(s): P02951

Entry history

Integrated into UniProtKB/Swiss-Prot:	July 21, 1986
Last sequence update:	January 23, 2007
Last modified:	May 1, 2013
This is version 53 of the entry and version 3 of the sequence. [Complete history]

Entry status

Reviewed (UniProtKB/Swiss-Prot)

Annotation program

Prokaryotic Protein Annotation Program