Plant/Algal cell antibodies / Photosynthesis / PSII (Photosystem II)

product information

The 22 kDa PsbS protein of photosystem II functions in the regulation of photosynthetic light harvesting. Along with a low thylakoid lumen pH and the presence of de-epoxidized xanthophylls, PsbS is necessary for photoprotective thermal dissipation of excess absorbed light energy in plants, measured as non-photochemical quenching of chlorophyll fluorescence.

KLH-conjugated synthetic peptide derived from available di and monocot PsbS sequences, including Arabidopsis thaliana (At1g44575). This sequence is even conserved in conifers.

store at 4°C; make aliquots to avoid working with a stock. Please, remember to spin tubes briefly prior to opening them to avoid any losses that might occur from liquid material adhering to the cap or sides of the tubes.

western blot (WB)

AS09 533 | anti-PsbS rabbit antibody

PSII  available antibodies against Photosystem II proteins

to be added when available

application information

1: 2000 - 1 : 4000 (WB)

28 | 22 kDa for Arabidopsis thaliana

Arabidopsis thaliana, Avena sativa, Brassica napus, Hordeum vulgare, Oryza sativa, Pinus sylvestris, Populus tremula, Spinacia oleracea

dicots and monocots, conifers

Chlamydomonas reinhardtii, Chlorella sp.

to be added when available

Hubbart et al. (2012). The photoprotective protein PsbS exerts control over CO₂ assimilation rate in fluctuating light in rice. The Plant J. March 2012.

application example

15 µg of Arabidopsis thaliana thylakoids from (1) PsbS-overexpressing line, (2) PsbS-deficient npq4-line, and (3) wt (col) together with (4) total leaf protein from Arabidopsis thaliana wt extracted with PEB (AS08 300) were separated on 4-12% NuPage (Invitrogen) LDS-PAGE and blotted 1h to nitrocellulose. Filters were blocked 1h with 2% low-fat milk powder in TBS-T (0.1% TWEEN 20) and probed with anti-PsbS (AS03 032, 1:2000, 1h) and secondary anti-rabbit (1:20000, 1 h) antibody (HRP conjugated, Abcam) in TBS-T containing 2% low fat milk powder.  Antibody incubations were followed by washings in TBS-T (15, +5, +5, +5 min). All steps were performed at RT with agitation. Signal was detected with standard ECL (GE Healthcare) using a Fuji LAS-3000 CCD (300s, standard sensitivity). Technical note(s): (a) This IgY shows reactivity to both markers loaded in lane M (MagicMark and NovexSharp, both Invitrogen), for comparison a marker lane from same filter (probed seperately with a IgG-antiserum) is shown to the right.  (b) the IgY reacts with 2 bands in leafs and thylakoids that both are absent in the PsbS-deficient npq4 line and therefore both might represent PsbS-forms with a difference in molecular weight of ~1 kDa.