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PubMed1978

Controlling the highest lactate dehydrogenase activity known in nature.

In the shipjack, Euthynnus pelamis, white muscle appears to possess a powerful anaerobic capacity as well as a significant carbohydrate based aerobic potential. Lactate dehydrogenase occurs at higher activities than found thus far anywhere else in nature and clearly functions in anaerobic glycolysis. Alpha-glycerophosphate dehydrogenase also occurs in unusually high activities and appears to play a role in aerobic glycolysis. Regulation of these two reactions is accomplished by temperature, pH, and creatine phosphate levels. High temperature, low pH, and low creatine phosphate levels all appear to favor lactate dehydrogenase over alpha-glycerophosphate dehydrogenase; low temperature, high pH, and high creatine-phosphate levels, all expected during the quiescent state in this species, and when metabolism in aerobic, all favor alpha-glycerophosphate dehydrogenase activity.

Adenosine Triphosphate↗
PubMed2003

Transfer of pro-R hydrogen from NADH to dihydroxyacetonephosphate by sn-glycerol-1-phosphate dehydrogenase from the archaeon Methanothermobacter thermautotrophicus.

sn-Glycerol-1-phosphate dehydrogenase is responsible for the formation of the sn-glycerol-1-phosphate backbone of archaeal lipids. [4-3H]NADH that had 3H at the R side was produced from [4-3H]NAD and glucose with glucose dehydrogenase (a pro-S type enzyme). The 3H of this [4-3H]NADH was transferred to dihydroxyacetonephosphate during the sn-glycerol-1-phosphate dehydrogenase reaction. On the contrary, in a similar reaction using alcohol dehydrogenase (a pro-R type enzyme), 3H was not incorporated into glycerophosphate. These results confirmed a prediction of the tertiary structure of sn-glycerol-1-phosphate dehydrogenase by homology modeling.

Dihydroxyacetone Phosphate↗
PubMed1977

[Functional interrelations between isozymes of dehydrogenases in the intact and denervated rabbit muscles].

A correlation is shown to exist between malate dehydrogenase (MDH), lactate dehydrogenase (LDH) and glycerol-3-phosphate dehydrogenase (glycerol-3-PDH activity values, lactate/pyruvate and malate/oxaloacetate coefficients, MDH and LDH isozyme spectra and kinetic properties of LDH isozymes in soluble fractions of cytoplasm from intact rabbit m. soleus (red), m. gastrocnemius (mixed) and m. quadratus lumborum (white). In denervated soleus and gastrocnemius the cytoplasmic MDH/LDH, mitochondrial MDH/LDH, MDH mitochondrial/MDH cytoplasmic activity ratios, concentrations of substrates and isozyme spectra of MDH and LDH tend to equalize. The obtained results indicate the importance of isozyme composition and total activity ratios of the dehydrogenases for regulation of pyruvate and NADH metabolic pathways.

Animals↗