Affinity chromatography of pig heart malate dehydrogenase on the Remazol Brilliant Blue R derivative of hydroxyethyl methacrylate gel

Konečný, Přemysl; Smrž, M.; Borák, J.; Slováková, S.

doi:10.1016/s0021-9673(01)96532-x

Cited by 5 publications

(1 citation statement)

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“…1-10 mM [6][7][8]. Previous procedures for purifying mMDH from bovine heart, involved multi-step protocols, combining ammonium sulfate and ethanol fractionation [22][23][24][25][26], with ion-exchange [22,24,25], hydrophobic chromatography [25] and dye-ligand chromatography [26]. The present procedure has only two chromatography steps, leading to mMDH preparation suitable for analytical purposes.…”

Section: Resultsmentioning

confidence: 99%

Simultaneous purification of L-malate dehydrogenase and L-lactate dehydrogenase from bovine heart by biomimetic-dye affinity chromatography

Labrou¹,

Clonis²

1997

Bioprocess Engineering

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Two commercially important enzymes, L-lactate dehydrogenase (LDH) and L-malate dehydrogenase (MDH) were purified simultaneously from bovine heart, on an agarose affinity adsorbent. This adsorbent bears a dye-ligand composed of an anthraquinone chlorotriazine chromophore linked to a biomimetic terminal 4-aminophenyloxanylic acid moiety. The purification protocol exploited the biomimetic affinity adsorbent, in combination with a cross-linked agarose DEAE anion-exchanger. The procedure comprised a preliminary anion-exchange first step, for the separation of the three enzyme activities, mMDH, cMDH and LDH. In the second step, that of affinity chromatography, the unbound mMDH obtained from the first step, was purified by specific elution with NAD>/sulphite (22.5-fold purification, 55% step-yield). The procedure afforded mMDH preparation of specific activity approx. 1,300 u/mg (25°C) at 45% overall yield, free of cytoplasmic MDH, glutamic-oxaloacetic transaminase (GOT) and fumarase. The LDH activity, which, bound to the anion-exchanger during the first step, was recovered from the adsorbent in 200 mM KCl, and finally purified by biomimeticdye affinity chromatography (NAD>/sulphite elution) and a second ion-exchange chromatography step (elution with 200 mM KCl). The LDH preparation exhibited specific activity approx. 500 u/mg at 25°C (content of impurities: pyruvate kinase and GOT were not detected; MDH, 0.01%).

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