P80589 (LHA2_RHOTE) Reviewed, UniProtKB/Swiss-Prot

Names and origin

Protein names	Recommended name: Light-harvesting polypeptide B-885 alpha-2 chain Alternative name(s): Antenna pigment polypeptide alpha-2 chain LH-1
Organism	Rhodocyclus tenuis (Rhodospirillum tenue)
Taxonomic identifier	1066 [NCBI]
Taxonomic lineage	cellular organisms › Bacteria › Proteobacteria › Betaproteobacteria › Rhodocyclales › Rhodocyclaceae › Rhodocyclus

Protein attributes

Sequence length	60 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 alpha 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	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 organelle inner membrane Inferred from electronic annotation. Source: InterPro 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 – 60	60	Light-harvesting polypeptide B-885 alpha-2 chain		PRO_0000099808
Regions
	Topological domain	1 – 16	16	Cytoplasmic Potential
	Transmembrane	17 – 37	21	Helical; Potential
	Topological domain	38 – 60	23	Periplasmic Potential
Sites
	Metal binding	33	1	Magnesium (bacteriochlorophyll axial ligand) Potential

Sequences

	Sequence		Length	Mass (Da)
	P80589 [UniParc]. Last modified October 1, 1996. Version 1. Checksum: B2C9130EE2B2E387	FASTA	60	6,635
	10 20 30 40 50 60 SAPAQWKLWL VMDPRTVMIG TAAWLGVLAL LIHFLLLGTE RFNWIDTGLK EQKATAAAQA

References

[1]	"The antenna complexes of the purple non-sulfur photosynthetic bacterium Rhodocyclus tenuis. Structural and spectral characterization." Hu Q., Brunisholz R.A., Frank G., Zuber H. Eur. J. Biochem. 238:381-390(1996) [PubMed] [Europe PMC] [Abstract] Cited for: PROTEIN SEQUENCE. Strain: DSM 109.

Cross-references

3D structure databases
ProteinModelPortal	P80589.
ModBase	Search...
Protocols and materials databases
StructuralBiologyKnowledgebase	Search...
Family and domain databases
InterPro	IPR000066. Antenna_a/b. IPR018332. Antenna_alpha. IPR002361. Antenna_alpha_CS. [Graphical view]
Pfam	PF00556. LHC. 1 hit. [Graphical view]
PRINTS	PR00673. LIGHTHARVSTA.
SUPFAM	SSF56918. Antenna_a/b. 1 hit.
PROSITE	PS00968. ANTENNA_COMP_ALPHA. 1 hit. [Graphical view]
ProtoNet	Search...

Entry information

Entry name

LHA2_RHOTE

Accession

Primary (citable) accession number: P80589

Entry history

Integrated into UniProtKB/Swiss-Prot:	October 1, 1996
Last sequence update:	October 1, 1996
Last modified:	April 3, 2013
This is version 60 of the entry and version 1 of the sequence. [Complete history]

Entry status

Reviewed (UniProtKB/Swiss-Prot)

Annotation program

Prokaryotic Protein Annotation Program