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Conditions of optimal PKAR-IA Enzyme performance should be determined experimentally by the investigator.
Price/availability/specifications subject to change without notice. Unless otherwise indicated, our catalog and customized products are for research use only and not intended for human or animal diagnostic or therapeutic use.
Phone: 1-617-401-8149
Fax: 1-617-606-5019
Email: message@sydlabs.com
Or leave a message with a formal purchase
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Introduction
The Regulatory (R) subunit of Protein Kinase A (PKA) inhibits its kinase activity by shielding the Catalytic (C) subunit from physiological substrates. This inhibition is reversed in response to extra-cellular signals that increase cAMP levels in the cytoplasm. Upon cAMP binding to R, C is allosterically released from R, activating a spectrum of downstream signaling cascades. Crystallographic data indicated that a series of distinct conformational changes within CBD-A must occur to relay the cAMP signal from the cAMP binding site to the R:C interaction interface. One critical cAMP relay site within the CBD-A of R has been identified as Asp170 because the D170A mutation selectively reduces the negative cooperativity between the cAMP- and C-recognition sites (i.e. the KD for the R:C complex in the presence of cAMP is reduced by more than 12-fold), without significantly compromising the high affinity of R for both binding partners.
BP000813-PKA-202: Recombinant (cAMP free) Protein Kinase A regulatory subunit-I A
Source: E. coli-derived.
Recombinant Human PKA regulatory subunit I a is a dimeric 86 kDa protein (the monomer is 381 aa 43 kDa). PKAR-I alpha is purified by proprietary chromatographic techniques.
The cAMP-dependent protein kinase, regulatory subunit RIa reversibly inhibits the catalytic subunit Ca of the cAMP-dependent protein kinase PKA. The inhibition of the catalytic subunit can be reversed by the addition of the second messenger cAMP.
Purity > 95%, by SDS-PAGE.
Formulation: PKA regulatory subunit-I alpha is supplied at a concentration of 1.3 mg/ml in 20 mM MOPS (pH 7.0), 150 mM NaCl, 1 mM ?-mercaptoethanol and 50% glycerol.
Shipping: The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below.
Stability & Storage: Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
12 months from date of receipt, -20 to -70°C as supplied.
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