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• W2090550241 endingPage "72" @default.
• W2090550241 startingPage "61" @default.
• W2090550241 abstract "We cloned, expressed, and purified a chimeric fusion between a soluble green fluorescent protein (smGFP) and the calmodulin binding protein calspermin. We have shown that the fusion protein, labeled smGN, has a K(i) in the calmodulin-dependent cyclic nucleotide phosphodiesterase activity assay of 1.97 nM, i.e., 3800 times smaller than that of the commonly used calmodulin inhibitor W7. Association and dissociation rate constants (k(a) and k(d)) and the dissociation equilibrium constant (K(D)) of smGN for calmodulin were determined using surface plasmon resonance (SPR). The k(a)=1.24 x 10(6)M(-1)s(-1), the k(d)=5.49 x 10(-3)s(-1), and the K(D)=4.42 x 10(-9)M. We also found that the GFP moiety was important for successfully binding calspermin to the surface of the CM5 flow cell at a sufficiently high concentration for SPR, and that this procedure may be used for SPR analysis of other acidic polypeptides, whose pI< or =4. To determine whether smGN might also bind to other calmodulin-like proteins in a heterologous system, we purified proteins from a plant total cell extract or a plant total protein extract by affinity chromatography against smGN. The purified proteins were identified as calmodulins by sodium dodecyl sulfate-polyacrylamide gel electrophoresis and liquid chromatography-tandem mass spectrometry, indicating a high level of specificity. We conclude that the high affinity and specific binding between smGN and calmodulin make it an easily localized recombinant alternative to chemical calmodulin inhibitors." @default.
• W2090550241 created "2016-06-24" @default.
• W2090550241 creator A5011671405 @default.
• W2090550241 creator A5066149991 @default.
• W2090550241 creator A5075712626 @default.
• W2090550241 date "2008-05-01" @default.
• W2090550241 modified "2023-10-09" @default.
• W2090550241 title "Surface plasmon resonance characterization of calspermin–calmodulin binding kinetics" @default.
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• W2090550241 doi "https://doi.org/10.1016/j.ab.2008.01.023" @default.
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