Thermal behavior of a lactate dehydrogenase purified from the heterothermic and sympatric vertebrate species brook lamprey (Lampetra planeri), tench (Tenca tenca), smooth (Triturus vulgaris) and alpine newt (Triturus alpestris)

Alessandro Ferracin, Margherita Annicchiarico, Annamaria Coscarella, Angela Teichner, Massimo Dell'Agata

Research output: Contribution to journalArticle

Abstract

1. 1. The A4 lactate dehydrogenase isozyme was purified to homogeneity from the tissues of Brook lamprey (Lampetra planeri) tench (Tenca tenca), smooth newt (Triturus vulgaris) and alpine newt (T. alpestris). 2. 2. These four species share their geographical distribution in the same freshwater habitats, often live together in the same station and two of them are congeneric. Steady-state kinetic investigations have shown that: 3. 3. Km (apparent) for pyruvate vs. temperature and (apparent) product Ki (Pyruvate) and Ki (Lactate) are fairly similar among species; 4. 4. kcat/Km decreases with temperature in the case of the newts but increases in the case of both lamprey and tench; 5. 5. Thermostability does not correlate to preferred ambient temperature and, in particular, tench LDH starts being inactivated up to 65°C. 6. 6. Thermostability does not correlate with activation energy either; 7. 7. No clear relationships can be demonstrated either between activation energy and conformational transitions in the molecule (these latter indicated by breaks in the Arrhenius plots) nor between activation energy and molecular flexibility, investigated by melting experiments.

Original languageEnglish
Pages (from-to)435-443
Number of pages9
JournalComparative Biochemistry and Physiology - B Biochemistry and Molecular Biology
Volume94
Issue number3
DOIs
Publication statusPublished - 1989

ASJC Scopus subject areas

  • Medicine(all)

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