Ureogenesis in Aantarctic birds-Blood levels of nitrogen compounds and liver and kidney arginase in penguins
A study was carried out on the levels and the kinetics of liver and kidney arginase from Pygoscelis penguins, the gentoo Pygoscelis papua, the chinstrap, Pygoscelis antarctica, and the Adelie, Pygoscelis adeliae. Higher values of blood urea were found in the gentoo penguins in the native state when...
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National Institute of Polar Research
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ftdoajarticles:oai:doaj.org/article:343d7d5354a740398e28d84132bf929a 2023-05-15T13:36:02+02:00 Ureogenesis in Aantarctic birds-Blood levels of nitrogen compounds and liver and kidney arginase in penguins Edson Rodrigues Rubens Rosa Metry Bacila 1998-03-01T00:00:00Z https://doi.org/10.15094/00009032 https://doaj.org/article/343d7d5354a740398e28d84132bf929a EN JA eng jpn National Institute of Polar Research http://doi.org/10.15094/00009032 https://doaj.org/toc/0085-7289 https://doaj.org/toc/2432-079X doi:10.15094/00009032 0085-7289 2432-079X https://doaj.org/article/343d7d5354a740398e28d84132bf929a Antarctic Record, Vol 42, Iss 1, Pp 111-119 (1998) Geography (General) G1-922 article 1998 ftdoajarticles https://doi.org/10.15094/00009032 2022-12-30T21:17:15Z A study was carried out on the levels and the kinetics of liver and kidney arginase from Pygoscelis penguins, the gentoo Pygoscelis papua, the chinstrap, Pygoscelis antarctica, and the Adelie, Pygoscelis adeliae. Higher values of blood urea were found in the gentoo penguins in the native state when compared with specimens maintained in the fasting state for 24 hours. In the chinstrap penguin Pygoscelis antarctica the average value for blood urea was 1.5 times higher in the native state than in the fasting condition. In the native gentoo penguin P. papua the relative increase in the blood urea concentration is as high as 3.5 times in regard to the levels found in the fasting state. In regard to the blood levels of uric acid, the difference between the native state and the fasting state is 2.0 times for P. antarctica and 4.8 times for P. papua. Specific activities of arginase assayed in penguin liver were 561 mU/mg protein and 208mU/mg protein for adult P. antarctica and P. papua respectively. Kinetic studies with arginase from penguin liver homogenates showed Km values for L-arginine of 16.0±2.0mM at pH9.5. Arginase from birds possesses in general high Km values (between 100-200mM). It seems then that the high protein diet and the high levels of blood urea of penguins are a consequence of the levels of hepatic arginase and the high affinity of this enzyme toward its substrate. Article in Journal/Newspaper Antarc* Antarctica Chinstrap penguin Gentoo penguin Pygoscelis adeliae Pygoscelis antarctica Pygoscelis papua Directory of Open Access Journals: DOAJ Articles |
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Geography (General) G1-922 |
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Geography (General) G1-922 Edson Rodrigues Rubens Rosa Metry Bacila Ureogenesis in Aantarctic birds-Blood levels of nitrogen compounds and liver and kidney arginase in penguins |
topic_facet |
Geography (General) G1-922 |
description |
A study was carried out on the levels and the kinetics of liver and kidney arginase from Pygoscelis penguins, the gentoo Pygoscelis papua, the chinstrap, Pygoscelis antarctica, and the Adelie, Pygoscelis adeliae. Higher values of blood urea were found in the gentoo penguins in the native state when compared with specimens maintained in the fasting state for 24 hours. In the chinstrap penguin Pygoscelis antarctica the average value for blood urea was 1.5 times higher in the native state than in the fasting condition. In the native gentoo penguin P. papua the relative increase in the blood urea concentration is as high as 3.5 times in regard to the levels found in the fasting state. In regard to the blood levels of uric acid, the difference between the native state and the fasting state is 2.0 times for P. antarctica and 4.8 times for P. papua. Specific activities of arginase assayed in penguin liver were 561 mU/mg protein and 208mU/mg protein for adult P. antarctica and P. papua respectively. Kinetic studies with arginase from penguin liver homogenates showed Km values for L-arginine of 16.0±2.0mM at pH9.5. Arginase from birds possesses in general high Km values (between 100-200mM). It seems then that the high protein diet and the high levels of blood urea of penguins are a consequence of the levels of hepatic arginase and the high affinity of this enzyme toward its substrate. |
format |
Article in Journal/Newspaper |
author |
Edson Rodrigues Rubens Rosa Metry Bacila |
author_facet |
Edson Rodrigues Rubens Rosa Metry Bacila |
author_sort |
Edson Rodrigues |
title |
Ureogenesis in Aantarctic birds-Blood levels of nitrogen compounds and liver and kidney arginase in penguins |
title_short |
Ureogenesis in Aantarctic birds-Blood levels of nitrogen compounds and liver and kidney arginase in penguins |
title_full |
Ureogenesis in Aantarctic birds-Blood levels of nitrogen compounds and liver and kidney arginase in penguins |
title_fullStr |
Ureogenesis in Aantarctic birds-Blood levels of nitrogen compounds and liver and kidney arginase in penguins |
title_full_unstemmed |
Ureogenesis in Aantarctic birds-Blood levels of nitrogen compounds and liver and kidney arginase in penguins |
title_sort |
ureogenesis in aantarctic birds-blood levels of nitrogen compounds and liver and kidney arginase in penguins |
publisher |
National Institute of Polar Research |
publishDate |
1998 |
url |
https://doi.org/10.15094/00009032 https://doaj.org/article/343d7d5354a740398e28d84132bf929a |
genre |
Antarc* Antarctica Chinstrap penguin Gentoo penguin Pygoscelis adeliae Pygoscelis antarctica Pygoscelis papua |
genre_facet |
Antarc* Antarctica Chinstrap penguin Gentoo penguin Pygoscelis adeliae Pygoscelis antarctica Pygoscelis papua |
op_source |
Antarctic Record, Vol 42, Iss 1, Pp 111-119 (1998) |
op_relation |
http://doi.org/10.15094/00009032 https://doaj.org/toc/0085-7289 https://doaj.org/toc/2432-079X doi:10.15094/00009032 0085-7289 2432-079X https://doaj.org/article/343d7d5354a740398e28d84132bf929a |
op_doi |
https://doi.org/10.15094/00009032 |
_version_ |
1766073620611727360 |