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• W2912294252 abstract "Globins are a classical model system for the studies of protein evolution and function. Recent studies have shown that - besides the well-known haemoglobin and myoglobin - additional globin-types occur in vertebrates that serve different functions. Globin E (GbE) was originally identified as an eye-specific protein of birds that is distantly related to myoglobin. GbE is also present in turtles and the coelacanth but appeared to have been lost in other vertebrates. Here, we show that GbE additionally occurs in lungfish, the closest living relatives of the tetrapods. Each lungfish species harbours multiple (≥5) GbE gene copies. Surprisingly, GbE is exclusively and highly expressed in oocytes, with mRNA levels that exceed that of myoglobin in the heart. Thus, GbE is the first known oocyte-specific globin in vertebrates. No GbE transcripts were found in the ovary or egg transcriptomes of other vertebrates, suggesting a lungfish-specific function. Spectroscopic analysis and kinetic studies of recombinant GbE1 of the South American lungfish Lepidosiren paradoxa revealed a typical pentacoordinate globin with myoglobin-like O2-binding kinetics, indicating similar functions. Our findings suggest that the multiple copies of GbE evolved to enhance O2-supply in the developing embryo of lungfish, analogous to the embryonic and fetal haemoglobins of other vertebrates. In evolution, GbE must have changed its expression site from oocytes to eyes, or vice versa." @default.
• W2912294252 created "2019-02-21" @default.
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• W2912294252 date "2019-01-22" @default.
• W2912294252 modified "2023-09-29" @default.
• W2912294252 title "Globin E is a myoglobin-related, respiratory protein highly expressed in lungfish oocytes" @default.
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• W2912294252 doi "https://doi.org/10.1038/s41598-018-36592-w" @default.
• W2912294252 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6343008" @default.
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