PsbC | CP43 protein of PSII

KLH-conjugated synthetic peptide chosen from known sequences of PsbC including  Arabidopsis thaliana PsbC, UniProt: P56778, TAIR: AtCg00280

45 | 43 kDa

Asimina parviflora, Borago officinalis, Cannabis sativa, Carthamus persicus, Casimirella guaranitica , Catalpa bungei, Calatola mollis, Citron x limon, Cunninghamia lanceolata, Deeringothamnus rugelii, Gonystylus bancanus, Ipomopsis aggregata, Leretia cordata, Lobatiriccardia lobata, Myricaria germanica , Nostoc sp. PCC7120, Nannochloropsis sp., Natsiatum herpeticum, Nicotiana benthamiana, Nothapodytes montana , Nerium oleander, Ottoschulzia rhodoxylon, Oxandra lanceolata,Solanum tuberosum, Oryza sativa, Panax quinquefolius, Prosopidastrum angusticarpum, Prosopis glandulosa, Rollinia mucosa, Rosmarinus officinalis, Saxifraga rivularis, Spinacia oleracea, Zelkova serrata, Zinnia violacea, Vachellia caven, Vitis vinifera, Zosteria marina,  Xerocladia viridiramis

Application example

5 µg of total protein from (1) Arabidopsis thaliana leaf extracted with Protein Extration Buffer, PEB (AS08 300), (2) Hordeum vulgare leaf extracted with PEB, (3) Chlamydomonas reinhardtii total cell extracted with PEB, (4) Synechococcus sp. 7942 total cell extracted with PEB,  extracted with PEB were separated on  4-12% NuPage (Invitrogen) LDS-PAGE and blotted 1h to PVDF. Blots were blocked immediately following transfer in 2% blocking reagent in 20 mM Tris, 137 mM sodium chloride pH 7.6 with 0.1% (v/v) Tween-20 (TBS-T) for 1h at room temperature with agitation. Blots were incubated in the primary antibody at a dilution of 1: 10 000 for 1h at room temperature with agitation. The antibody solution was decanted and the blot was rinsed briefly twice, then washed once for 15 min and 3 times for 5 min in TBS-T at room temperature with agitation. Blots were incubated in secondary antibody (anti-rabbit IgG horse radish peroxidase conjugated, recommended secondary antibody AS09 602) diluted to 1:25 000 in 2% blocking solution for 1h at room temperature with agitation. The blots were washed as above and developed for 5 min with chemiluminescent detection reagent according the manufacturers instructions. Images of the blots were obtained using a CCD imager (FluorSMax, Bio-Rad) and Quantity One software (Bio-Rad). Exposure time was 75 seconds.

PsbC (CP43) acts as an antenna to the PSII core and its presence seem to be also necessary for maintaining water splitting activity. This protein is more weakly associated with the PSII reaction centre and can be removed from the isolated core.