PsbD | D2 protein of PSII positive control/quantitation standard

AS09 146S | Recombinant protein standard for quantitation and positive control

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product information
Background		D2 protein (PsbD) forms the reaction core of PSII (Photosystem II) as a heterodimer with the D1 protein (PsbA). PsbD is homologous to the D1 protein, with slightly higher molecular mass of about 39,5 kDa. Accumulation of D2 protein is an important step in the assemply of the PSII reaction centre complex. This product is a recombinant protein standard, source Synechocystis strain PCC 6803.
Host
Clonality
Clone
Purity
Format		Lyophilized in glycerol
Quantity		250 µl
Reconstitution		For reconstitution add 225 µl of sterile water. Please notice that this product contains 10% glycerol and might appear as liquid but is provided lyophilized.
Storage		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		Collection of other protein standards AS06 146 \| anti-PsbD \| D2 protein of PSII antibodies Collection of other global antibodies Collection of antibodies to PSII proteins
Additional information		The PsbD protein standard can be used in combination with global anti-PsbD antibodies to quantitate PsbD from a wide range of species. Global antibodies are raised against highly conserved amino acid sequences in the PsbD protein. Quantitative western blot: detailed method description, video tutorial

application information
Recommended dilution		Standard curve: 3 loads are recommended (0.5, 2 and 4μl). For most applications a sample load of 0.2 μg of chlorophyll will give a PsbD signal in this range. Positive control: a 2 μl load per well is optimal for most chemiluminescent detection systems. This standard is stabilized and ready and does not require heating before loading on the gel. Please note that this product contains 10% glycerol and might appear as liquid but is provided lyophilized. Allow the product several minutes to solubilize after adding water. Mix thoroughly but gently Take extra care to mix thoroughly before each use, as the proteins tend to settle with the more dense layer after freezing.
Expected \| apparent MW		In most gel systems PsbD migrates around 28-30 kDa
Confirmed reactivity
Predicted reactivity
Not reactive in
Additional information		Concentration: after adding 225 µl of milliQ water final concentration of the standard is 0.25 pmoles/ul Protein standard buffer composition: Glycerol 10%, Tris Base 141 mM, Tris HCl 106 mM, LDS 2%, EDTA 0.51 mM, SERVA® Blue G250 0.22 mM, Phenol Red 0.175 mM, pH 8.5, 0.1mg/ml PefaBloc protease inhibitor (Roche), 50mM DTT. This standard is ready-to-load and does not require any additions or heating. It needs to be fully thawed and thoroughly mixed prior to using. Avoid vigorous vortexing, as buffers contain detergent. Following mixing, briefly pulse in a microcentrifuge to collect material from cap. This standard is stabilized and ready and does not require heating before loading on the gel. Please note that this product contains 10% glycerol and might appear as liquid but is provided lyophilized. Allow the product several minutes to solubilize after adding water. Mix thoroughly but gently Take extra care to mix thoroughly before each use, as the proteins tend to settle with the more dense layer after freezing.
Selected references		Li et al. (2016). A Hard Day's Night: Diatoms Continue Recycling Photosystem II in the Dark. Front. Mar. Sci., 08 November 2016 Li et al. (2014). The nitrogen costs of photosynthesis in a diatom under current and future pCO2. New Phytol. 2014 Sep 25. doi: 10.1111/nph.13037.

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