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首页> 外文期刊>The Journal of Experimental Biology >Myoglobin oxygen affinity in aquatic and terrestrial birds and mammals
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Myoglobin oxygen affinity in aquatic and terrestrial birds and mammals

机译：对水生和陆生鸟类和哺乳动物的肌红蛋白氧亲和力

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摘要

Myoglobin (Mb) is an oxygen binding protein found in vertebrate skeletal muscle, where it facilitates intracellular transport and storage of oxygen. This protein has evolved to suit unique physiological needs in the muscle of diving vertebrates that express Mb at much greater concentrations than their terrestrial counterparts. In this study, we characterized Mb oxygen affinity (P-50) from 25 species of aquatic and terrestrial birds and mammals. Among diving species, we tested for correlations between Mb P-50 and routine dive duration. Across all species examined, Mb P-50 ranged from 2.40 to 4.85 mmHg. The mean P-50 of Mb from terrestrial ungulates was 3.72 +/- 0.15 mmHg (range 3.70-3.74 mmHg). The P-50 of cetaceans was similar to terrestrial ungulates ranging from 3.54 to 3.82 mmHg, with the exception of the melon-headed whale, which had a significantly higher P-50 of 4.85 mmHg. Among pinnipeds, the P-50 ranged from 3.23 to 3.81 mmHg and showed a trend for higher oxygen affinity in species with longer dive durations. Among diving birds, the P-50 ranged from 2.40 to 3.36 mmHg and also showed a trend of higher affinities in species with longer dive durations. In pinnipeds and birds, low Mb P-50 was associated with species whose muscles are metabolically active under hypoxic conditions associated with aerobic dives. Given the broad range of potential globin oxygen affinities, Mb P-50 from diverse vertebrate species appears constrained within a relatively narrow range. High Mb oxygen affinity within this range may be adaptive for some vertebrates that make prolonged dives.
机译：肌红蛋白（Mb）是一种在脊椎动物骨骼肌中发现的氧结合蛋白，可促进细胞内氧的运输和储存。该蛋白质已经进化为适应潜水脊椎动物的肌肉中独特的生理需要，这些脊椎动物表达Mb的浓度要比其陆地对应物高得多。在这项研究中，我们表征了来自25种水生和陆生鸟类和哺乳动物的Mb氧亲和力（P-50）。在潜水物种中，我们测试了Mb P-50与常规潜水时间之间的相关性。在所有检查的物种中，Mb P-50的范围为2.40至4.85 mmHg。来自陆生有蹄类动物的Mb的平均P-50为3.72 +/- 0.15 mmHg（范围3.70-3.74 mmHg）。鲸类动物的P-50与陆地有蹄类动物相似，范围在3.54至3.82 mmHg之间，但瓜头鲸除外，后者的P-50明显更高，为4.85 mmHg。在针刺人群中，P-50的范围为3.23至3.81 mmHg，并且在潜水时间较长的物种中显示出更高的氧亲和力趋势。在潜水鸟类中，P-50的范围为2.40至3.36 mmHg，并且在较长潜水时间的物种中也显示出亲和力更高的趋势。在pin和鸟类中，低Mb P-50与在有氧潜水相关的低氧条件下其肌肉具有代谢活性的物种有关。考虑到潜在的球蛋白氧亲和力的广泛范围，来自各种脊椎动物的Mb P-50似乎被限制在相对狭窄的范围内。在此范围内的高Mb氧亲和力可能适用于某些长时间潜水的脊椎动物。

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