NCBI Accession #
NP_001319163.1
NCBI GenBank Nucleotide #
NM_001333231.1
NCBI Official Full Name
Chlorophyll A-B binding family protein
NCBI Official Symbol
NPQ4
NCBI Official Synonym Symbols
CP22; NONPHOTOCHEMICAL QUENCHING 4; PHOTOSYSTEM II SUBUNIT S; PSBS; PSII-S; T18F15.3; T18F15_3
NCBI Protein Information
Chlorophyll A-B binding family protein
NCBI Summary
Encoding PSII-S (CP22), a ubiquitous pigment-binding protein associated with photosystem II (PSII) of higher plants. Involved in nonphotochemical quenching rather than in photosynthesis. Mutant has a normal violaxanthin cycle but has a limited capacity of quenching singlet excited chlorophylls and is tolerant to lipid peroxidation.
UniProt Protein Name
Photosystem II 22 kDa protein, chloroplastic
UniProt Synonym Protein Names
CP22
UniProt Primary Accession #
Q9XF91
UniProt Secondary Accession #
Q56XH2; Q94EI1; Q9ST34
UniProt Related Accession #
Q9XF91
UniProt Comments
Plays an important role in non-photochemical quenching, a process maintains the balance between dissipation and utilization of light energy to minimize generation of oxidizing molecules, thereby protecting the plant against photo-oxidative damage. Is not necessary for efficient light harvesting and photosynthesis.