Correction to: Diagnostic utility of a targeted next-generation sequencing gene panel in the clinical suspicion of systemic autoinflammatory diseases: a multi-center study

The second affiliation of the corresponding author Eda Tahir Turanlı was incorrectly published as İstanbul Medeniyet University instead of Istanbul Technical University.

NADP-linked isocitrate dehydrogenase from beef liver: a new method of purification and the effect of metal ion cofactor on its stability

1. A more rapid and efficient method of purification of beef liver NADP-linked isocitrate dehydrogenase is reported. The method involves gel filtration, ion-exchange, and affinity chromatography techniques. The enzyme is obtained in pure form with a recovery of 33%. The specific activity is 43 U/mg at 25 degrees C in the presence of Mn2+ ions and 31 U/mg under previously reported conditions and assuming a specific absorption coefficient of 1.29 cm2/mg at 280 nm. Both the yield and the specific activity are higher than the previously reported values. The apparent Km values for isocitrate and NADP+ are 1.7 and 7.3 microM, respectively, in the presence of 0.2 mM MnCl2, from the initial rate data obtained with a sensitive fluorimeter. 2. The stability of the enzyme at 25 degrees C is investigated. The enzyme is rapidly inactivated when preincubated with isocitrate and NADP+, in the absence of metal ion, and it cannot use free isocitrate as substrate.

The effects of inorganic salts on the stability of isocitrate dehydrogenase from beef (Bos taurus) heart and liver

1. Distinct differences are established between the two isozymes of NADP+-dependent isocitrate dehydrogenase, purified from beef (BOS taurus) heart and liver, with respect to their net electrical charges and stabilization properties in the presence of inorganic salts. 2. Inorganic salts also inhibit the isozymes with different apparent Ki values. 3. Both isozymes are found to be heat labile in the absence and cold labile in the presence of salts. 4. The results indicate that different mechanisms of heat stabilization exist due to different conformational states which are less active but more stable.