P80102 (LHA1_ECTHL) Reviewed, UniProtKB/Swiss-Prot

Names and origin

Protein names	Recommended name: Light-harvesting protein B800/830/1020 alpha-1 chain Alternative name(s): Antenna pigment protein alpha-1 chain EHS-alpha-1
Organism	Ectothiorhodospira halochloris
Taxonomic identifier	1052 [NCBI]
Taxonomic lineage	cellular organisms › Bacteria › Proteobacteria › Gammaproteobacteria › Chromatiales › Ectothiorhodospiraceae › Halorhodospira

Protein attributes

Sequence length	52 AA.
Sequence status	Fragment.
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 – ›52	›52	Light-harvesting protein B800/830/1020 alpha-1 chain		PRO_0000099781
Regions
	Topological domain	1 – 12	12	Cytoplasmic Potential
	Transmembrane	13 – 33	21	Helical; Potential
	Topological domain	34 – ›52	›19	Periplasmic Potential
Sites
	Metal binding	29	1	Magnesium (bacteriochlorophyll axial ligand) Potential
Experimental info
	Non-terminal residue	52	1

Sequences

	Sequence		Length	Mass (Da)
	P80102 [UniParc]. Last modified February 1, 1994. Version 1. Checksum: 85E1D99B23CE6E0F	FASTA	52	6,191
	10 20 30 40 50 MWRIWKVFDP RRILIATAIW LIIIALTIHV ILMTTERFNW LEGAPAAEYY SS

References

[1]

"The primary structure of the antenna polypeptides of Ectothiorhodospira halochloris and Ectothiorhodospira halophila. Four core-type antenna polypeptides in E. halochloris and E. halophila." Wagner-Huber R., Brunisholz R.A., Bissig I., Frank G., Suter F., Zuber H. Eur. J. Biochem. 205:917-925(1992) [PubMed] [Europe PMC] [Abstract] Cited for: PROTEIN SEQUENCE. Strain: DSM 1059.

Cross-references

Sequence databases
PIR	S23285.
3D structure databases
ProteinModelPortal	P80102.
SMR	P80102. Positions 1-44.
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

LHA1_ECTHL

Accession

Primary (citable) accession number: P80102

Entry history

Integrated into UniProtKB/Swiss-Prot:	February 1, 1994
Last sequence update:	February 1, 1994
Last modified:	April 3, 2013
This is version 59 of the entry and version 1 of the sequence. [Complete history]

Entry status

Reviewed (UniProtKB/Swiss-Prot)

Annotation program

Prokaryotic Protein Annotation Program