Q8LCQ4 · LHCA6_ARATH

Function

function

The light-harvesting complex (LHC) functions as a light receptor, it captures and delivers excitation energy to photosystems with which it is closely associated. Seems involved in the function of the photosystem I in low light conditions, when other LHCA proteins are less abundant. Required, together with LHCA5, for the formation of a full-size NAD(P)H dehydrogenase-photosystem I supercomplex (NDH-PSI) that triggers cyclic and chlororespiratory electron transport in chloroplast thylakoids, especially under stress conditions (e.g. increased light intensity).

Cofactor

Note: Binds at least 14 chlorophylls (8 Chl-a and 6 Chl-b) and carotenoids such as lutein and neoxanthin.

Features

Showing features for binding site.

127020406080100120140160180200220240260
TypeIDPosition(s)Description
Binding site68Mg (UniProtKB | ChEBI) of chlorophyll b 1 (UniProtKB | ChEBI); axial binding residue
Binding site88chlorophyll a 1 (UniProtKB | ChEBI)
Binding site107Mg (UniProtKB | ChEBI) of chlorophyll a 1 (UniProtKB | ChEBI); axial binding residue
Binding site112chlorophyll b 2 (UniProtKB | ChEBI)
Binding site165Mg (UniProtKB | ChEBI) of chlorophyll b 3 (UniProtKB | ChEBI); axial binding residue
Binding site168chlorophyll b 4 (UniProtKB | ChEBI)
Binding site221chlorophyll a 5 (UniProtKB | ChEBI)
Binding site222Mg (UniProtKB | ChEBI) of chlorophyll a 3 (UniProtKB | ChEBI); axial binding residue
Binding site225Mg (UniProtKB | ChEBI) of chlorophyll a 4 (UniProtKB | ChEBI); axial binding residue
Binding site227chlorophyll a 1 (UniProtKB | ChEBI)
Binding site239Mg (UniProtKB | ChEBI) of chlorophyll a 5 (UniProtKB | ChEBI); axial binding residue
Binding site254Mg (UniProtKB | ChEBI) of chlorophyll a 6 (UniProtKB | ChEBI); axial binding residue

GO annotations

AspectTerm
Cellular Componentchloroplast
Cellular Componentchloroplast thylakoid membrane
Cellular Componentphotosystem I
Molecular Functionchlorophyll binding
Molecular Functionmetal ion binding
Biological Processphotosynthesis, light harvesting in photosystem I

Keywords

Names & Taxonomy

Protein names

  • Recommended name
    Photosystem I chlorophyll a/b-binding protein 6, chloroplastic
  • Alternative names
    • LHCI type III LHCA6

Gene names

    • Name
      LHCA6
    • ORF names
      T29M8.2
    • Ordered locus names
      At1g19150

Organism names

  • Taxonomic identifier
  • Strain
    • cv. Columbia
  • Taxonomic lineage
    Eukaryota > Viridiplantae > Streptophyta > Embryophyta > Tracheophyta > Spermatophyta > Magnoliopsida > eudicotyledons > Gunneridae > Pentapetalae > rosids > malvids > Brassicales > Brassicaceae > Camelineae > Arabidopsis

Accessions

  • Primary accession
    Q8LCQ4
  • Secondary accessions
    • Q43382
    • Q84WT1
    • Q9LMB1

Proteomes

Organism-specific databases

Genome annotation databases

Subcellular Location

Features

Showing features for transmembrane.

TypeIDPosition(s)Description
Transmembrane146-164Helical
Transmembrane228-244Helical

Keywords

Phenotypes & Variants

Disruption phenotype

Slightly lower NDH activity in immature leaves. No chlorophyll fluorescence increase in mature leaves. Smaller version of the NAD(P)H dehydrogenase-photosystem I supercomplex (NDH-PSI) supercomplex (PubMed:19903870).
In the double mutant lhca5 lhca6, drastic reduction of NDH subunits accumulation upon increased light intensity (PubMed:21278308).

Variants

We now provide the "Disease & Variants" viewer in its own tab.

The viewer provides 16 variants from UniProt as well as other sources including ClinVar and dbSNP.

Go to variant viewer

PTM/Processing

Features

Showing features for transit peptide, chain.

Type
IDPosition(s)Description
Transit peptide1-33Chloroplast
ChainPRO_000043545034-270Photosystem I chlorophyll a/b-binding protein 6, chloroplastic

Post-translational modification

Photoregulated by reversible phosphorylation of its threonine residues.

Proteomic databases

PTM databases

Expression

Gene expression databases

Interaction

Subunit

The LHC complex consists of chlorophyll a-b binding proteins (PubMed:19903870).
Homodimer. Binds pigments (By similarity).
Element of the NAD(P)H dehydrogenase-photosystem I supercomplex (NDH-PSI) (PubMed:19903870).

Protein-protein interaction databases

Family & Domains

Features

Showing features for region, compositional bias.

Type
IDPosition(s)Description
Region16-36Disordered
Compositional bias19-36Polar residues

Domain

The N-terminus of the protein extends into the stroma where it is involved with adhesion of granal membranes and post-translational modifications; both are believed to mediate the distribution of excitation energy between photosystems I and II.

Sequence similarities

Keywords

Phylogenomic databases

Family and domain databases

Sequence

  • Sequence status
    Complete
  • Sequence processing
    The displayed sequence is further processed into a mature form.
  • Length
    270
  • Mass (Da)
    29,939
  • Last updated
    2002-10-01 v1
  • MD5 Checksum
    5AFF21C30AD39C6B83133420D9E9E672
MAFAIASALTSTLTLSTSRVQNPTQRRPHVASTSSTGGRLMRERLVVVRAGKEVSSVCEPLPPDRPLWFPGSSPPEWLDGSLPGDFGFDPLGLGSDPDTLKWFAQAELIHSRWAMLAVTGIIIPECLERLGFIENFSWYDAGSREYFADSTTLFVAQMVLMGWAEGRRWADLIKPGSVDIEPKYPHKVNPKPDVGYPGGLWFDFMMWGRGSPEPVMVLRTKEIKNGRLAMLAFLGFCFQATYTSQDPIENLMAHLADPGHCNVFSAFTSH

Sequence caution

The sequence AAF82226.1 differs from that shown. Reason: Erroneous gene model prediction

Features

Showing features for compositional bias, sequence conflict.

Type
IDPosition(s)Description
Compositional bias19-36Polar residues
Sequence conflict21in Ref. 4; AAO22627
Sequence conflict29in Ref. 1; AAA57542
Sequence conflict67-76in Ref. 1; AAA57542
Sequence conflict91in Ref. 1; AAA57542
Sequence conflict194in Ref. 1; AAA57542

Keywords

Sequence databases

Nucleotide SequenceProtein SequenceMolecule TypeStatus
U03395
EMBL· GenBank· DDBJ
AAA57542.1
EMBL· GenBank· DDBJ
mRNA
AC069143
EMBL· GenBank· DDBJ
AAF82226.1
EMBL· GenBank· DDBJ
Genomic DNA Sequence problems.
CP002684
EMBL· GenBank· DDBJ
AEE29811.1
EMBL· GenBank· DDBJ
Genomic DNA
BT002807
EMBL· GenBank· DDBJ
AAO22627.1
EMBL· GenBank· DDBJ
mRNA
BT020322
EMBL· GenBank· DDBJ
AAV85677.1
EMBL· GenBank· DDBJ
mRNA
BT020554
EMBL· GenBank· DDBJ
AAW70400.1
EMBL· GenBank· DDBJ
mRNA
AY086461
EMBL· GenBank· DDBJ
AAM63464.1
EMBL· GenBank· DDBJ
mRNA

Genome annotation databases

Similar Proteins

Disclaimer

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