P35090 (LHA2_RHOAC) Reviewed, UniProtKB/Swiss-Prot

Names and origin

Protein names	Recommended name: Light-harvesting protein B-800/820 alpha chain Alternative name(s): Antenna pigment protein alpha chain
Organism	Rhodopseudomonas acidophila (Rhodoblastus acidophilus)
Taxonomic identifier	1074 [NCBI]
Taxonomic lineage	cellular organisms › Bacteria › Proteobacteria › Alphaproteobacteria › Rhizobiales › Bradyrhizobiaceae › Rhodoblastus

Protein attributes

Sequence length	53 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 – 53	53	Light-harvesting protein B-800/820 alpha chain		PRO_0000099785
Regions
	Topological domain	1 – 14	14	Cytoplasmic Potential
	Transmembrane	15 – 35	21	Helical; Potential
	Topological domain	36 – 53	18	Periplasmic Potential
Sites
	Metal binding	31	1	Magnesium (bacteriochlorophyll axial ligand) Potential

Sequences

	Sequence		Length	Mass (Da)
	P35090 [UniParc]. Last modified February 1, 1994. Version 1. Checksum: 9B7A159269F66759	FASTA	53	5,567
	10 20 30 40 50 MNQGKIWTVV NPAVGLPLLL GSVAITALLV HLAVLTHTTW FPAFTQGGLK KAA

References

[1]	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.

Cross-references

3D structure databases
ProteinModelPortal	P35090.
SMR	P35090. Positions 2-53.
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_RHOAC

Accession

Primary (citable) accession number: P35090

Entry history

Integrated into UniProtKB/Swiss-Prot:	February 1, 1994
Last sequence update:	February 1, 1994
Last modified:	April 5, 2011
This is version 58 of the entry and version 1 of the sequence. [Complete history]

Entry status

Reviewed (UniProtKB/Swiss-Prot)

Annotation program

Prokaryotic Protein Annotation Program