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Peroxidase 3

Cycas revoluta (Sago palm)
Reviewed-Annotation score: -Experimental evidence at protein leveli


Removal of H2O2, oxidation of toxic reductants, biosynthesis and degradation of lignin, suberization, auxin catabolism, response to environmental stresses such as wounding, pathogen attack and oxidative stress. These functions might be dependent on each isozyme/isoform in each plant tissue.Curated

Catalytic activityi

2 phenolic donor + H2O2 = 2 phenoxyl radical of the donor + 2 H2O.


Protein has several cofactor binding sites:
  • Ca2+PROSITE-ProRule annotationBy similarityNote: Binds 2 calcium ions per subunit.PROSITE-ProRule annotationBy similarity
  • heme bPROSITE-ProRule annotationBy similarityNote: Binds 1 heme b (iron(II)-protoporphyrin IX) group per subunit.PROSITE-ProRule annotationBy similarity

GO - Molecular functioni

GO - Biological processi


Molecular functionOxidoreductase, Peroxidase
Biological processHydrogen peroxide
LigandCalcium, Heme, Iron, Metal-binding

Names & Taxonomyi

Protein namesi
Recommended name:
Peroxidase 3 (EC:
OrganismiCycas revoluta (Sago palm)
Taxonomic identifieri3396 [NCBI]
Taxonomic lineageiEukaryotaViridiplantaeStreptophytaEmbryophytaTracheophytaSpermatophytaCycadidaeCycadalesCycadaceaeCycas

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

Keywords - Cellular componenti

Cell wall, Secreted

PTM / Processingi

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
ChainiPRO_0000315885‹1 – ›15Peroxidase 3Add BLAST›15

Family & Domainsi

Sequence similaritiesi

Belongs to the peroxidase family. Classical plant (class III) peroxidase subfamily.PROSITE-ProRule annotation


Sequence statusi: Fragment.

Mass (Da):1,603
Last modified:January 15, 2008 - v1

Experimental Info

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Non-terminal residuei11 Publication1
Non-terminal residuei151 Publication1

Similar proteinsi


3D structure databases


Protocols and materials databases

Structural Biology KnowledgebaseSearch...

Family and domain databases


Entry informationi

Entry nameiPER3_CYCRE
AccessioniPrimary (citable) accession number: P85348
Entry historyiIntegrated into UniProtKB/Swiss-Prot: January 15, 2008
Last sequence update: January 15, 2008
Last modified: January 7, 2015
This is version 20 of the entry and version 1 of the sequence. See complete history.
Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programPlant Protein Annotation Program


Keywords - Technical termi

Direct protein sequencing


  1. SIMILARITY comments
    Index of protein domains and families
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Main funding by: National Institutes of Health

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