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Protein

Chlorophyll a-b binding protein 50, chloroplastic

Gene

CAB50

Organism
Nicotiana tabacum (Common tobacco)
Status
Reviewed-Annotation score: -Experimental evidence at transcript leveli

Functioni

The light-harvesting complex (LHC) functions as a light receptor, it captures and delivers excitation energy to photosystems with which it is closely associated.

Cofactori

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

Sites

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Metal bindingi59Magnesium (chlorophyll-b 1 axial ligand); via carbonyl oxygenBy similarity1
Binding sitei81Chlorophyll-a 1; via amide nitrogenBy similarity1
Binding sitei87Chlorophyll-a 1By similarity1
Metal bindingi100Magnesium (chlorophyll-a 1 axial ligand)By similarity1
Metal bindingi103Magnesium (chlorophyll-a 2 axial ligand)By similarity1
Binding sitei105Chlorophyll-b 2By similarity1
Metal bindingi154Magnesium (chlorophyll-b 2 axial ligand); via carbonyl oxygenBy similarity1
Binding sitei158Chlorophyll-b 3By similarity1
Binding sitei166Chlorophyll-b 4 or chlorophyll-b 5By similarity1
Metal bindingi174Magnesium (chlorophyll-b 3 axial ligand)By similarity1
Binding sitei177Chlorophyll-b 4By similarity1
Binding sitei183Chlorophyll-b 2; via amide nitrogenBy similarity1
Binding sitei214Chlorophyll-a 5By similarity1
Metal bindingi218Magnesium (chlorophyll-a 4 axial ligand)By similarity1
Binding sitei220Chlorophyll-a 1By similarity1
Metal bindingi232Magnesium (chlorophyll-a 5 axial ligand)By similarity1
Metal bindingi247Magnesium (chlorophyll-a 6 axial ligand)By similarity1
Binding sitei256Chlorophyll-a 6; via amide nitrogenBy similarity1
Binding sitei263Chlorophyll-b 5; via carbonyl oxygenBy similarity1

GO - Molecular functioni

GO - Biological processi

Keywordsi

Biological processPhotosynthesis
LigandChlorophyll, Chromophore, Magnesium, Metal-binding

Names & Taxonomyi

Protein namesi
Recommended name:
Chlorophyll a-b binding protein 50, chloroplastic
Alternative name(s):
LHCII type I CAB-50
Short name:
LHCP
Gene namesi
Name:CAB50
OrganismiNicotiana tabacum (Common tobacco)
Taxonomic identifieri4097 [NCBI]
Taxonomic lineageiEukaryotaViridiplantaeStreptophytaEmbryophytaTracheophytaSpermatophytaMagnoliophytaeudicotyledonsGunneridaePentapetalaeasteridslamiidsSolanalesSolanaceaeNicotianoideaeNicotianeaeNicotiana
Proteomesi
  • UP000084051 Componenti: Genome assembly

Subcellular locationi

Extracellular region or secreted Cytosol Plasma membrane Cell wall Cytoskeleton Vacuole Chloroplast Endosome Peroxisome ER Golgi apparatus Nucleus Mitochondrion Manual annotation Automatic computational assertion Graphics by Christian Stolte; Source: COMPARTMENTS

Topology

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Transmembranei101 – 121HelicalSequence analysisAdd BLAST21
Transmembranei153 – 173HelicalSequence analysisAdd BLAST21
Transmembranei221 – 241HelicalSequence analysisAdd BLAST21

Keywords - Cellular componenti

Chloroplast, Membrane, Photosystem I, Photosystem II, Plastid, Thylakoid

PTM / Processingi

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Transit peptidei1 – 35ChloroplastSequence analysisAdd BLAST35
ChainiPRO_000000370636 – 267Chlorophyll a-b binding protein 50, chloroplasticAdd BLAST232

Amino acid modifications

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Modified residuei36N2-acetylarginineBy similarity1
Modified residuei38PhosphothreonineBy similarity1

Post-translational modificationi

Photoregulated by reversible phosphorylation of its threonine residues.By similarity

Keywords - PTMi

Acetylation, Phosphoprotein

Proteomic databases

PRIDEiP27496

Interactioni

Subunit structurei

The LHC complex consists of chlorophyll a-b binding proteins.

Structurei

3D structure databases

ProteinModelPortaliP27496
SMRiP27496
ModBaseiSearch...
MobiDBiSearch...

Family & Domainsi

Domaini

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 similaritiesi

Keywords - Domaini

Transit peptide, Transmembrane, Transmembrane helix

Family and domain databases

Gene3Di1.10.3460.10, 1 hit
InterProiView protein in InterPro
IPR001344 Chloro_AB-bd_pln
IPR022796 Chloroa_b-bind
IPR023329 Chlorophyll_a/b-bd_dom_sf
PANTHERiPTHR21649 PTHR21649, 1 hit
PfamiView protein in Pfam
PF00504 Chloroa_b-bind, 1 hit

Sequencei

Sequence statusi: Complete.

Sequence processingi: The displayed sequence is further processed into a mature form.

P27496-1 [UniParc]FASTAAdd to basket
« Hide
        10         20         30         40         50
MAAATMALSS SSFAGKAVKL SPSSSEITGN GKVTMRKTVT KAKPLSSGSP
60 70 80 90 100
WYGPDRVKYL GPFSGESPSY LTGEFPGDYG WDTAGLSADP ETFAKNRELE
110 120 130 140 150
VIHCRWAMLG ALGCVFPELL ARNGVKFGEA VWFKAGSQIF SEGGLDYLGN
160 170 180 190 200
PSLVHAQSIL AIWACQVVLM GAVEGYRVAG GPLGEVVDPL YPGGSFDPLG
210 220 230 240 250
LAEDPEAFAE LKVKHIKNGR LAMFSMFGFF VQAIVTGKGP LENLADHLAD
260
PVNNNAWSYA TNFVPGK
Length:267
Mass (Da):28,347
Last modified:August 1, 1992 - v1
Checksum:i6F459B2051C4707E
GO

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
X52742 mRNA Translation: CAA36956.1
PIRiS11720 CDNT50

Similar proteinsi

Cross-referencesi

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
X52742 mRNA Translation: CAA36956.1
PIRiS11720 CDNT50

3D structure databases

ProteinModelPortaliP27496
SMRiP27496
ModBaseiSearch...
MobiDBiSearch...

Proteomic databases

PRIDEiP27496

Protocols and materials databases

Structural Biology KnowledgebaseSearch...

Family and domain databases

Gene3Di1.10.3460.10, 1 hit
InterProiView protein in InterPro
IPR001344 Chloro_AB-bd_pln
IPR022796 Chloroa_b-bind
IPR023329 Chlorophyll_a/b-bd_dom_sf
PANTHERiPTHR21649 PTHR21649, 1 hit
PfamiView protein in Pfam
PF00504 Chloroa_b-bind, 1 hit
ProtoNetiSearch...

Entry informationi

Entry nameiCB25_TOBAC
AccessioniPrimary (citable) accession number: P27496
Entry historyiIntegrated into UniProtKB/Swiss-Prot: August 1, 1992
Last sequence update: August 1, 1992
Last modified: February 28, 2018
This is version 86 of the entry and version 1 of the sequence. See complete history.
Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programPlant Protein Annotation Program

Miscellaneousi

Keywords - Technical termi

Complete proteome, Reference proteome

Documents

  1. SIMILARITY comments
    Index of protein domains and families
UniProt is an ELIXIR core data resource
Main funding by: National Institutes of Health

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