Leiva Eriksson, Nélida and Reeder, Brandon J and Wilson, Michael T and Bülow, Leif (2019) Sugar beet hemoglobins: reactions with nitric oxide and nitrite reveal differential roles for nitrogen metabolism. Biochemical Journal, 476 (14). pp. 2111-2125. DOI https://doi.org/10.1042/bcj20190154
Leiva Eriksson, Nélida and Reeder, Brandon J and Wilson, Michael T and Bülow, Leif (2019) Sugar beet hemoglobins: reactions with nitric oxide and nitrite reveal differential roles for nitrogen metabolism. Biochemical Journal, 476 (14). pp. 2111-2125. DOI https://doi.org/10.1042/bcj20190154
Leiva Eriksson, Nélida and Reeder, Brandon J and Wilson, Michael T and Bülow, Leif (2019) Sugar beet hemoglobins: reactions with nitric oxide and nitrite reveal differential roles for nitrogen metabolism. Biochemical Journal, 476 (14). pp. 2111-2125. DOI https://doi.org/10.1042/bcj20190154
Abstract
In contrast with human hemoglobin (Hb) in red blood cells, plant Hbs do not transport oxygen, instead research points towards nitrogen metabolism. Using comprehensive and integrated biophysical methods we characterized three sugar beet Hbs: BvHb1.1, BvHb1.2 and BvHb2. Their affinities for oxygen, CO, and hexacoordination were determined. Their role in nitrogen metabolism was studied by assessing their ability to bind NO, to reduce nitrite (NiR, nitrite reductase), and to form nitrate (NOD, NO dioxygenase). Results show that BvHb1.2 has high NOD-like activity, in agreement with the high nitrate levels found in seeds where this protein is expressed. BvHb1.1, on the other side, is equally capable to bind NO as to form nitrate, its main role would be to protect chloroplasts from the deleterious effects of NO. Finally, the ubiquitous, reactive, and versatile BvHb2, able to adopt ‘open and closed forms’, would be part of metabolic pathways where the balance between oxygen and NO is essential. For all proteins, the NiR activity is relevant only when nitrite is present at high concentrations and both NO and oxygen are absent. The three proteins have distinct intrinsic capabilities to react with NO, oxygen and nitrite; however, it is their concentration which will determine the BvHbs’ activity.
Item Type: | Article |
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Uncontrolled Keywords: | Beta vulgaris; Nitrites; Nitrogen; Nitric Oxide; Nitrite Reductases; Oxygenases; Hemoglobins; Plant Proteins |
Divisions: | Faculty of Science and Health Faculty of Science and Health > Life Sciences, School of |
SWORD Depositor: | Unnamed user with email elements@essex.ac.uk |
Depositing User: | Unnamed user with email elements@essex.ac.uk |
Date Deposited: | 02 Sep 2019 10:47 |
Last Modified: | 07 Aug 2024 18:24 |
URI: | http://repository.essex.ac.uk/id/eprint/25244 |
Available files
Filename: 2111.full.pdf
Licence: Creative Commons: Attribution-Noncommercial-No Derivative Works 3.0