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Rice ( Oryza) hemoglobins

Hemoglobins (Hbs) corresponding to non-symbiotic (nsHb) and truncated (tHb) Hbs have been identified in rice ( Oryza). This review discusses the major findings from the current studies on rice Hbs. At the molecular level, a family of the nshb genes, consisting of hb1, hb2, hb3, hb4 and hb5, and a si...

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Autores principales: Arredondo-Peter, Raúl, Moran, Jose F., Sarath, Gautam
Formato: Online Artículo Texto
Lenguaje:English
Publicado: F1000Research 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4304225/
https://www.ncbi.nlm.nih.gov/pubmed/25653837
http://dx.doi.org/10.12688/f1000research.5530.2
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author Arredondo-Peter, Raúl
Moran, Jose F.
Sarath, Gautam
author_facet Arredondo-Peter, Raúl
Moran, Jose F.
Sarath, Gautam
author_sort Arredondo-Peter, Raúl
collection PubMed
description Hemoglobins (Hbs) corresponding to non-symbiotic (nsHb) and truncated (tHb) Hbs have been identified in rice ( Oryza). This review discusses the major findings from the current studies on rice Hbs. At the molecular level, a family of the nshb genes, consisting of hb1, hb2, hb3, hb4 and hb5, and a single copy of the thb gene exist in Oryza sativa var. indica and O. sativa var. japonica, Hb transcripts coexist in rice organs and Hb polypeptides exist in rice embryonic and vegetative organs and in the cytoplasm of differentiating cells. At the structural level, the crystal structure of rice Hb1 has been elucidated, and the structures of the other rice Hbs have been modeled. Kinetic analysis indicated that rice Hb1 and 2, and possibly rice Hb3 and 4, exhibit a very high affinity for O (2), whereas rice Hb5 and tHb possibly exhibit a low to moderate affinity for O (2). Based on the accumulated information on the properties of rice Hbs and data from the analysis of other plant and non-plant Hbs, it is likely that Hbs play a variety of roles in rice organs, including O (2)-transport, O (2)-sensing, NO-scavenging and redox-signaling. From an evolutionary perspective, an outline for the evolution of rice Hbs is available. Rice nshb and thb genes vertically evolved through different lineages, rice nsHbs evolved into clade I and clade II lineages and rice nshbs and thbs evolved under the effect of neutral selection. This review also reveals lacunae in our ability to completely understand rice Hbs. Primary lacunae are the absence of experimental information about the precise functions of rice Hbs, the properties of modeled rice Hbs and the cis-elements and trans-acting factors that regulate the expression of rice hb genes, and the partial understanding of the evolution of rice Hbs.
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spelling pubmed-43042252015-02-03 Rice ( Oryza) hemoglobins Arredondo-Peter, Raúl Moran, Jose F. Sarath, Gautam F1000Res Review Hemoglobins (Hbs) corresponding to non-symbiotic (nsHb) and truncated (tHb) Hbs have been identified in rice ( Oryza). This review discusses the major findings from the current studies on rice Hbs. At the molecular level, a family of the nshb genes, consisting of hb1, hb2, hb3, hb4 and hb5, and a single copy of the thb gene exist in Oryza sativa var. indica and O. sativa var. japonica, Hb transcripts coexist in rice organs and Hb polypeptides exist in rice embryonic and vegetative organs and in the cytoplasm of differentiating cells. At the structural level, the crystal structure of rice Hb1 has been elucidated, and the structures of the other rice Hbs have been modeled. Kinetic analysis indicated that rice Hb1 and 2, and possibly rice Hb3 and 4, exhibit a very high affinity for O (2), whereas rice Hb5 and tHb possibly exhibit a low to moderate affinity for O (2). Based on the accumulated information on the properties of rice Hbs and data from the analysis of other plant and non-plant Hbs, it is likely that Hbs play a variety of roles in rice organs, including O (2)-transport, O (2)-sensing, NO-scavenging and redox-signaling. From an evolutionary perspective, an outline for the evolution of rice Hbs is available. Rice nshb and thb genes vertically evolved through different lineages, rice nsHbs evolved into clade I and clade II lineages and rice nshbs and thbs evolved under the effect of neutral selection. This review also reveals lacunae in our ability to completely understand rice Hbs. Primary lacunae are the absence of experimental information about the precise functions of rice Hbs, the properties of modeled rice Hbs and the cis-elements and trans-acting factors that regulate the expression of rice hb genes, and the partial understanding of the evolution of rice Hbs. F1000Research 2014-12-11 /pmc/articles/PMC4304225/ /pubmed/25653837 http://dx.doi.org/10.12688/f1000research.5530.2 Text en Copyright: © 2014 Arredondo-Peter R et al. http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. http://creativecommons.org/publicdomain/zero/1.0/ Data associated with the article are available under the terms of the Creative Commons Zero "No rights reserved" data waiver (CC0 1.0 Public domain dedication).
spellingShingle Review
Arredondo-Peter, Raúl
Moran, Jose F.
Sarath, Gautam
Rice ( Oryza) hemoglobins
title Rice ( Oryza) hemoglobins
title_full Rice ( Oryza) hemoglobins
title_fullStr Rice ( Oryza) hemoglobins
title_full_unstemmed Rice ( Oryza) hemoglobins
title_short Rice ( Oryza) hemoglobins
title_sort rice ( oryza) hemoglobins
topic Review
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4304225/
https://www.ncbi.nlm.nih.gov/pubmed/25653837
http://dx.doi.org/10.12688/f1000research.5530.2
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