PsaC | PSI-C core subunit of photosystem I

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AS10 939 | clonality: polyclonal | host: rabbit | reactivity: [global antibody] for higher plants, algae, cyanobacteria, diatoms


52 st
Item No:
AS10 939

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product information

PsaC is a conserved, chloroplast-encoded, Fe-S binding protein of approximately 10kDa, present in all known Photosystem I complexes. It is located on the stromal side of the thylacoid membranes. PsaC coordinates the Fe–S clusters FA and FB through two cysteine-rich domains.


KLH-conjugated synthetic peptide conserved in all known PsaC proteins includingArabidopsis thaliana AtCg01060, Hordeum vulgare P69416, Oryza sativa P0C360, Chlamydomonas reinhardtii Q00914, Synechococcus elongatus Q31QV2

Host Rabbit
Clonality Polyclonal
Purity Serum
Format Lyophilized
Quantity 50 ĩl
Reconstitution For reconstitution add 50 ĩl of sterile water.

store lyophilized/reconstituted at -20°C; once reconstituted make aliquots to avoid repeated freeze-thaw cycles. Please, remember to spin tubes briefly prior to opening them to avoid any losses that might occur from lyophilized material adhering to the cap or sides of the tubes.

Tested applications western blot (WB)
Related products

AS10 939-10 | PsaC | PSI-C core subunit of photosystem I
AS04 042P | PsaC | PSI-C core subunit of photosystem I (PsaC antibody + PsaC protein positive control )
AS04 042S
| PsaC protein standard for quantitation or positive control
collection of antibodies to PSI proteins

Plant and algal protein extraction buffer

Secondary antibodies

Additional information

Peptide target used to elicit this antibody is well conserved in all photoautotrophs except some cyanobacteria, some red algae and Cyanophora paradoxa, which contain a conserved substitution of a valine to an isoleucine. The performance of the antibodies has been confirmed against taxa containing both the valine and isoleucine variants.

Example of a simulataneous western blot detection with RbcL, PsbA and PsaC antibodies.

More information about quantitative western blot using PsaC antibody can be found here.

application information
Recommended dilution

1: 1000 with ECL (WB)

Expected | apparent MW

9 kDa

Confirmed reactivity

Arabidopsis thaliana, Chlamydomonas reinhardtii, Dactylis glomerata, Horderum vulgare, Mesembryanthemum sp.,Spinacia oleracea, Synechococcus PCC 7942, Cyanophora paradoxa, Flaveria sp. , Heterosigma akashiwo, Thalassiosira pseudonan, Euglena gracilis, Micromonas pusilla, Chlamydomonas reinhardtii, Porphyra sp., Gonyaulax polyedra, Emiliania huxleyi, symbiotic dinoflagellates of Stylophora pistillata and Turbinaria reniformis; Phaeodactylum tricornutum, Thalassiosira pseudonana

Predicted reactivity Chromera velia, Glycine max, Nicotiana tabacum, Spinacia oleraceaPhyscomitrella patens, algae and cyanobacteria, Nannochloropsis sp., Prochlorococcus sp. (surface and a deep water ecotype), Synechococcus PCC 8801, Thermosynechococcus elongatus (BP-1)
Not reactive in

no confirmed exceptions from predicted reactivity known in the moment

Additional information

In some species minor cross reactions with some larger proteins are seen. These may contain related iron-sulfur binding motifs. Therefore size verification of the reacting band is required. Due to the small size of the protein, care should be taken to differentiate between chemiluminescent signal from PsaC and non-specific signals from chlotophylls or lipids if pigment is retained near the bottom of the blot.

For the most optimal results use:thylakoid membranes or PSI particles,  solubilized in a SDS sample buffer (final concentrations: 63 mM Tris HCl, 10% glycerol, 2% SDS, 0.0025% bromophenol blue) with 2.5% beta-mercaptoethanol at 85C for 2 minutes. The samples were spun softly, then the supernatant loaded. 

Selected references Heinnickel et al. (2016). Tetratricopeptide repeat protein protects photosystem I from oxidative disruption during assembly. Proc Natl Acad Sci U S A. 2016 Mar 8;113(10):2774-9. doi: 10.1073/pnas.1524040113
Rozpądek et al. (2015). The fungal endophyte Epichloë typhina improves photosynthesis efficiency of its host orchard grass (Dactylis glomerata). Planta. 2015 Jun 10.
Subramanyam et al. (2014). Structural and functional changes of PSI-LHCI supercomplexes of Chlamydomonas reinhardtii cells grown under high salt conditions. Planta. 2010 Mar;231(4):913-22.
 et al. (2014). Combined Increases in Mitochondrial Cooperation and Oxygen Photoreduction Compensate for Deficiency in Cyclic Electron Flow in Chlamydomonas reinhardtii. Plant Cell. 2014 Jul 2. pii: tpc.114.126375.

application example

western blot using anti-PsaC antibodies
5 µg of total protein from samples such as (1) Arabidopsis thaliana leaf, (2) Hordeum vulgare leaf,  (3) Chlamydomonas reinhardtii total cell, (4) Synechococcus sp. 7942 total cell, (5) PsaC protein standard (AS04 042S), total protein from all the samples were extracted with Protein Extraction Buffer PEB (AS08 300). Samples were diluted with 1X sample buffer (NuPAGE LDS sample buffer (Invitrogen) supplemented with 50 mM DTT and heat at 70°C for 5 min and kept on ice before loading. Protein samples were separated on NuPAGE 4-12% Tris-Bis gel (Invitrogen) LDS-PAGE and blotted for 1h to 1.5h on PVDF using tank transfer. Blots were blocked immediately following transfer in 2% ECL Advance blocking reagent for 1h at RT with agitation. Blots were incubated with PsaC antibody at a dilution of 1: 10 000 (in blocking reagent) for 1h at RT with agitation. The antibody solution was decanted and the blot was rinsed briefly twice, and then washed 1x15 min and 3x5 min with TBS-T at RT with agitation. Blots were incubated in secondary antibody (anti-rabbit IgG HRP conjugated, AS09 602) diluted to 1:50 000 in blocking reagent for 1h at RT with agitation. The blots were washed as above. The blot was developed for 5 min with ECL Advance (GE Healthcare). Images of the blots were obtained using a CCD imager (FluorSMax, Bio-Rad) and Quantity One software (Bio-Rad).

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