High impact information on Tuna

• CONCLUSIONS: Tuna burgers, a relatively new menu item in restaurants, were associated with an increase in histamine poisoning cases in North Carolina. Tuna ground for burgers can be susceptible to both temperature fluctuations and bacterial contamination [1].
• Tuna cytochrome c at 2.0 A resolution. I.Ferricytochrome structure analysis [2].
• The Atlantic northern bluefin and southern bluefin tunas possessed mtDNA sequences very similar to species of yellowfin tuna group and not so similar to albacore and bigeye tunas which were morphologically assigned to the bluefin tuna group [3].
• Conversely, evolutionary (tunas vs. billfishes) differences in CS arise from differences in posttranscriptional regulation, based on relationships between CS enzyme levels and CS mRNA assessed by quantitative competitive RT-PCR [4].
• The differences among Ca2+ uptake and ATP hydrolysis rates do not seem to result from intrinsic differences between the SERCA2 present in the different tunas, as shown by their similar temperature sensitivities and similar values for activation energy [5].

Biological context of Tuna

• Previous studies based on mitochondrial RFLP data have shown that bigeye tunas from the Atlantic Ocean are the most interesting from a genetic point of view [6].
• We hypothesize that a key step in the evolution of high heart rate and high metabolic rate in tunas is increased activity of the SERCA2 enzyme [5].

Anatomical context of Tuna

• In fact, in some fish species (tunas, burbot) the SR of atrial myocytes, under certain circumstances, may act as the major source of systolic Ca(2+) [7].

Associations of Tuna with chemical compounds

• Measurements of oxalate-supported Ca2+ uptake in SR-enriched ventricular vesicles indicated that tunas were capable of sustaining a rate of Ca2+ uptake that was significantly higher than the mackerel [5].
• Tuna oil-in-water emulsion droplets coated by lecithin and chitosan produce cationic emulsion droplets that are more oxidatively stable than emulsions coated by lecithin alone [8].
• Tunas are very active fish with a high aerobic capacity, but they also regularly perform burst swimming with massive production of lactic acid [9].
• 2. Tunas contained high concentrations of histidine, anserine and creatine in white muscle, and of taurine, anserine and creatine in dark muscle [10].
• Potent synthetic analogues of angiotensin-converting enzyme inhibitor derived from Tuna muscle [11].

Gene context of Tuna

• We investigated the origins of variation in the activity of the mitochondrial enzyme citrate synthase (CS), an index of mitochondrial abundance, among fiber types and species of high-performance fish (tunas and billfishes) [4].
• Among tunas, the cold-tolerant bluefin had the highest rates of SR Ca2+ uptake and ATPase activity [5].
• 3) Tuna have much red muscle that contains a high concentration of myoglobin [12].

References