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- W2067873676 abstract "The interaction of apoconcanavalin A (apo-Con A) with Mn2+ and Ca2+ was studied at 25 degrees C using fluorescence stopped flow. The reaction was monitored using 4-methylumbelliferyl alpha-D-mannopyranoside whose fluorescence is quenched on binding to the metalloproteins. At pH 5.0 entry of Mn2+ into apo is second-order (rate constant = 1.2 x 103 M(-1) s(-1)); at higher pH the rate constant is greater than 104 M(-1) s(-1). Reaction of excess Ca2+ with Mn(Con A) is pseudo-first-order with kobsd = Kk[Ca2+](1 + K[Ca2+])(-1). This is interpreted as rapid formation of unlocked MnCa(Con A), with a formation constant K = 3.5 x 102 M(-1), which transforms (k = 0.026 s(-1)) to a locked form, indistinguishable from native. At pH 6.4 and 7.2, K greater than or equal to 103 M(-1) and k = 0.043 and 0.050 s(-1), respectively. Ca(Con A) and Mn(Con A) precipitate glycogen and bind to 4-methylumbelliferyl alpha-D-mannopyranoside as effectively as native protein at pH 7.2. Treatment of the Ca or Mn forms with EDTA produces an apo form with a small binding capacity, which it loses slowly." @default.
- W2067873676 created "2016-06-24" @default.
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- W2067873676 date "1978-10-01" @default.
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- W2067873676 title "Interaction of calcium and manganese ions with apoconcanavalin A and sugar binding" @default.
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- W2067873676 doi "https://doi.org/10.1021/bi00613a021" @default.
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