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MetaCyc Protein: LHCI-705

Species: Chlamydomonas reinhardtii

Component of: PS I-LHCI supercomplex (summary available)

Subunit composition of LHCI-705 = [LHCA4][LHCA1]
         Light-harvesting protein of photosystem I = LHCA4 (summary available)
         Light-harvesting protein of photosystem I = LHCA1 (summary available)

Summary:
Heterodimer of Lhca1 and Lhac4 subunits with characteristic 77K fluorescence peaks at 705 nm

Citations: [Knoetzel92, Bassi92]

Locations: chloroplast

Gene-Reaction Schematic: ?

GO Terms:

Cellular Component: GO:0009507 - chloroplast

Credits:
Created 12-Jan-2010 by May P , MPI-MP


Subunit of: PS I-LHCI supercomplex

Species: Chlamydomonas reinhardtii

Subunit composition of PS I-LHCI supercomplex = [(LHCA3)(LHCA2)][(LHCA4)(LHCA1)][(PsaO)(PsaN)(PsaL)(PsaK)(PsaJ)(PsaI)(PsaH)(PsaG)(PsaF)(PsaE)(PsaD)(PsaC)(PsaB)(PsaA)]
         LHCI-680 = (LHCA3)(LHCA2) (summary available)
                 Light-harvesting chlorophyll-a/b protein of photosystem I = LHCA3 (summary available)
                 Light-harvesting protein of photosystem I = LHCA2 (summary available)
         LHCI-705 = (LHCA4)(LHCA1) (summary available)
                 Light-harvesting protein of photosystem I = LHCA4 (summary available)
                 Light-harvesting protein of photosystem I = LHCA1 (summary available)
         photosystem I = (PsaO)(PsaN)(PsaL)(PsaK)(PsaJ)(PsaI)(PsaH)(PsaG)(PsaF)(PsaE)(PsaD)(PsaC)(PsaB)(PsaA) (extended summary available)
                 Photosystem I subunit O = PsaO (summary available)
                 Photosystem I reaction center subunit N = PsaN (summary available)
                 Photosystem I reaction center subunit XI = PsaL (summary available)
                 Photosystem I reaction center subunit psaK = PsaK (summary available)
                 Photosystem I reaction center subunit IX = PsaJ (summary available)
                 Photosystem I reaction centre, subunit VIII = PsaI (summary available)
                 Photosystem I reaction center subunit VI = PsaH (summary available)
                 Photosystem I reaction center subunit V = PsaG (summary available)
                 Photosystem I reaction center subunit III = PsaF (summary available)
                 Photosystem I reaction center subunit IV = PsaE (summary available)
                 Photosystem I reaction center subunit II = PsaD (summary available)
                 Photosystem I iron-sulfur center = PsaC (summary available)
                 Photosystem I P700 chlorophyll a apoprotein A2 = PsaB (summary available)
                 Photosystem I P700 chlorophyll a apoprotein A1 = PsaA (summary available)

Summary:
The core of the PS I-LHCI supercomplex is formed by the PsaA/B heterodimer with a few small subunits surrounding it, and this core contains all the components necessary for plastocyanin-ferredoxin oxidoreductase activity. All eukaryotic PSI cores characterized so far are monomers [Amunts07]. Except for a few chlorophylls required for the photochemistry, all chlorophylls bound in the core subunits function as light-harvesting pigments. Attached to the core are peripheral light-harvesting antennae composed of several LHCI proteins. Light energy captured by these light-harvesting chlorophylls is delivered to the P700 chlorophyll, where it is trapped as a stable charge separation. Chlamydomonas antenna is composed of LHCI-705 and LHCI-680 subcomplexes formed by Lhca1-4 polypeptides [Bassi92].

Citations: [Jun09]

Locations: chloroplast

GO Terms:

Cellular Component: GO:0009507 - chloroplast

Credits:
Created 12-Jan-2010 by May P , MPI-MP


Subunit of LHCI-705: Light-harvesting protein of photosystem I

Gene: LHCA4 Accession Number: CHLREDRAFT_168073 (MetaCyc)

Locations: chloroplast

Molecular Weight: 28.43 kD (from nucleotide sequence)

GO Terms:

Cellular Component: GO:0009507 - chloroplast

MultiFun Terms: metabolism energy production/transport

Unification Links: Pride:A8I000 , Protein Model Portal:A8I000 , String:3055.JGI168073 , UniProt:A8I000

Relationship Links: InterPro:IN-FAMILY:IPR001344 , InterPro:IN-FAMILY:IPR022796 , InterPro:IN-FAMILY:IPR023329 , Panther:IN-FAMILY:PTHR21649 , Pfam:IN-FAMILY:PF00504

Summary:
LHC-IThe light harvesting antenna proteins LHC are pigment proteins that bind chlorophyll. They are adept at capturing light energy at different wavelengths and transferring it to the reaction centre of PSI. The PSI core uses this excitation energy for charge separation [Wientjes11].


Subunit of LHCI-705: Light-harvesting protein of photosystem I

Gene: LHCA1 Accession Number: CHLREDRAFT_184471 (MetaCyc)

Locations: chloroplast

Molecular Weight: 24.91 kD (from nucleotide sequence)

GO Terms:

Cellular Component: GO:0009507 - chloroplast

MultiFun Terms: metabolism energy production/transport

Unification Links: Pride:A8J249 , Protein Model Portal:A8J249 , String:3055.JGI184471 , UniProt:A8J249

Relationship Links: InterPro:IN-FAMILY:IPR001344 , InterPro:IN-FAMILY:IPR022796 , InterPro:IN-FAMILY:IPR023329 , Panther:IN-FAMILY:PTHR21649 , Pfam:IN-FAMILY:PF00504

Summary:
The light harvesting antenna proteins LHC are pigment proteins that bind chlorophyll. They are adept at capturing light energy at different wavelengths and transferring it to the reaction centre of PSI. The PSI core uses this excitation energy for charge separation [Wientjes11].


References

Amunts07: Amunts A, Drory O, Nelson N (2007). "The structure of a plant photosystem I supercomplex at 3.4 A resolution." Nature 447(7140);58-63. PMID: 17476261

Bassi92: Bassi R, Soen SY, Frank G, Zuber H, Rochaix JD (1992). "Characterization of chlorophyll a/b proteins of photosystem I from Chlamydomonas reinhardtii." J Biol Chem 267(36);25714-21. PMID: 1464588

Jun09: Jun Minagawa (2009). "Light-Harvesting Proteins." Chapter 14. In: The Chlamydomonas Sourcebook. Second Edition.

Knoetzel92: Knoetzel J, Svendsen I, Simpson DJ (1992). "Identification of the photosystem I antenna polypeptides in barley. Isolation of three pigment-binding antenna complexes." Eur J Biochem 206(1);209-15. PMID: 1587270

Wientjes11: Wientjes E, van Stokkum IH, van Amerongen H, Croce R (2011). "The role of the individual Lhcas in photosystem I excitation energy trapping." Biophys J 101(3);745-54. PMID: 21806943


Report Errors or Provide Feedback
Please cite the following article in publications resulting from the use of MetaCyc: Caspi et al, Nucleic Acids Research 42:D459-D471 2014
Page generated by SRI International Pathway Tools version 18.5 on Fri Nov 28, 2014, BIOCYC13B.