PsbI | Small subunit I of PSII (cyanobacterial)

KLH-conjugated synthetic peptide derived from Synechocystis sp. PCC 6803 PsbI sequence UniProt: Q54697

4.3 kDa

Application example

Membrane fraction (0.5 µg chl), prepared from Synechocystis sp. PCC 6803, was separated on 12% SDS-PAGE and blotted in 2 hours at RT to PVDF membrane. Membrane was blocked for 1h using 0.2% tween 20 in TBS, probed with anti-PsbI (1:10 000) antibody in TTBS overnight at 8ºC and secondary anti-rabbit in TTBS (1:10000,1h, room temperature). Blot was developed for 5 min in West pico substrate and image of the blot was obtained using Fuji LAS 4000.

The PsbI protein, previously named the 4.8-kDa protein, is encoded by the plastome. PsbI is a universal component of PSII and is highly conserved (e.g. there is 71% amino acid identicality between the Arabidopsis and Synechocystis 6803 proteins). The protein contains 36 to 38 amino acids in most species, with molecular masses ranging between 4.1 and 4.5 kDa. Synonymes: PSII-I, PSII 4.8 kDa protein