East—west gradient in ectoenzyme activities in the subarctic Pacific: Possible regulation by zinc
We determined depth profiles of potential activities of leucine aminopeptidase (LAPase) and β—glucosidase (BGase) in the subarctic Pacific between July and September 1997. The data revealed a systematic shift in vertical patterns of the LAPase:BGase ratios along the east‐west axis of the investigate...
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crwiley:10.4319/lo.2000.45.4.0930 2024-09-15T17:59:37+00:00 East—west gradient in ectoenzyme activities in the subarctic Pacific: Possible regulation by zinc Fukuda, Rumi Sohrin, Yoshiki Saotome, Nobue Fukuda, Hideki Nagata, Toshi Koike, Isao 2000 http://dx.doi.org/10.4319/lo.2000.45.4.0930 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.2000.45.4.0930 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.2000.45.4.0930 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Limnology and Oceanography volume 45, issue 4, page 930-939 ISSN 0024-3590 1939-5590 journal-article 2000 crwiley https://doi.org/10.4319/lo.2000.45.4.0930 2024-08-09T04:19:38Z We determined depth profiles of potential activities of leucine aminopeptidase (LAPase) and β—glucosidase (BGase) in the subarctic Pacific between July and September 1997. The data revealed a systematic shift in vertical patterns of the LAPase:BGase ratios along the east‐west axis of the investigated area. The ratio increased by over 10‐fold with depth in the eastern region (139°W‐159°W), while it varied little (<3‐fold) in the central region (169°W‐179°E, including the Bering Sea). It decreased with depth by about six‐fold in the western region (169°E–161°E). The decrease of LAPase:BGase ratio with depth is consistent with a general pattern in the decomposition of sinking particles, i.e., protein is degraded faster than polysaccharides, but the increase of the ratio with depth suggests that export of proteinaceous materials to the mesopelagic zone is high. Cell specific LAPase activity in the upper layer (0–100 m) was positively correlated ( r = 0.92, P < 0.05) with the concentration of dissolved zinc, a catalytic element of proteases. We hypothesize that the low level of dissolved zinc stresses LAPase activity in the euphotic zone, leading to high export of protein to the mesopelagic zone in the eastern subarctic Pacific. These results have important implications for modeling the carbon and nitrogen pump in open oceans where surface concentrations of trace metals are extremely low. Article in Journal/Newspaper Bering Sea Subarctic Wiley Online Library Limnology and Oceanography 45 4 930 939 |
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Wiley Online Library |
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crwiley |
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English |
description |
We determined depth profiles of potential activities of leucine aminopeptidase (LAPase) and β—glucosidase (BGase) in the subarctic Pacific between July and September 1997. The data revealed a systematic shift in vertical patterns of the LAPase:BGase ratios along the east‐west axis of the investigated area. The ratio increased by over 10‐fold with depth in the eastern region (139°W‐159°W), while it varied little (<3‐fold) in the central region (169°W‐179°E, including the Bering Sea). It decreased with depth by about six‐fold in the western region (169°E–161°E). The decrease of LAPase:BGase ratio with depth is consistent with a general pattern in the decomposition of sinking particles, i.e., protein is degraded faster than polysaccharides, but the increase of the ratio with depth suggests that export of proteinaceous materials to the mesopelagic zone is high. Cell specific LAPase activity in the upper layer (0–100 m) was positively correlated ( r = 0.92, P < 0.05) with the concentration of dissolved zinc, a catalytic element of proteases. We hypothesize that the low level of dissolved zinc stresses LAPase activity in the euphotic zone, leading to high export of protein to the mesopelagic zone in the eastern subarctic Pacific. These results have important implications for modeling the carbon and nitrogen pump in open oceans where surface concentrations of trace metals are extremely low. |
format |
Article in Journal/Newspaper |
author |
Fukuda, Rumi Sohrin, Yoshiki Saotome, Nobue Fukuda, Hideki Nagata, Toshi Koike, Isao |
spellingShingle |
Fukuda, Rumi Sohrin, Yoshiki Saotome, Nobue Fukuda, Hideki Nagata, Toshi Koike, Isao East—west gradient in ectoenzyme activities in the subarctic Pacific: Possible regulation by zinc |
author_facet |
Fukuda, Rumi Sohrin, Yoshiki Saotome, Nobue Fukuda, Hideki Nagata, Toshi Koike, Isao |
author_sort |
Fukuda, Rumi |
title |
East—west gradient in ectoenzyme activities in the subarctic Pacific: Possible regulation by zinc |
title_short |
East—west gradient in ectoenzyme activities in the subarctic Pacific: Possible regulation by zinc |
title_full |
East—west gradient in ectoenzyme activities in the subarctic Pacific: Possible regulation by zinc |
title_fullStr |
East—west gradient in ectoenzyme activities in the subarctic Pacific: Possible regulation by zinc |
title_full_unstemmed |
East—west gradient in ectoenzyme activities in the subarctic Pacific: Possible regulation by zinc |
title_sort |
east—west gradient in ectoenzyme activities in the subarctic pacific: possible regulation by zinc |
publisher |
Wiley |
publishDate |
2000 |
url |
http://dx.doi.org/10.4319/lo.2000.45.4.0930 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.2000.45.4.0930 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.2000.45.4.0930 |
genre |
Bering Sea Subarctic |
genre_facet |
Bering Sea Subarctic |
op_source |
Limnology and Oceanography volume 45, issue 4, page 930-939 ISSN 0024-3590 1939-5590 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.4319/lo.2000.45.4.0930 |
container_title |
Limnology and Oceanography |
container_volume |
45 |
container_issue |
4 |
container_start_page |
930 |
op_container_end_page |
939 |
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1810436727469244416 |