2bgq: Difference between revisions
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caption="2bgq, resolution 2.50Å" /> | caption="2bgq, resolution 2.50Å" /> | ||
'''APO ALDOSE REDUCTASE FROM BARLEY'''<br /> | '''APO ALDOSE REDUCTASE FROM BARLEY'''<br /> | ||
==Overview== | |||
In most higher plants a period of desiccation is the terminal event in embryogenesis. Excised barley embryos acquire desiccation tolerance at a precise developmental stage and cDNA clones have been isolated which are temporally linked with desiccation tolerance. One such clone (pG22-69) with a putative gene product of 34 kd displays high structural homology to mammalian genes encoding an NADPH dependent aldose reductase involved in the synthesis of sorbitol. This first aldose reductase gene of plants is expressed constitutively during embryo maturation and is modulated by the plant hormones abscisic acid (ABA) and gibberellic acid (GA). Immunohistochemistry showed that the protein is preferentially expressed in tissues formed at early stages in embryogenesis. Measurements of enzymatic activity indicate that pG22-69 encodes an active aldose reductase. The finding of this reductase activity and the cloning of the corresponding gene supports the existence of a metabolic pathway in plants playing a role in the synthesis of osmolytes like sorbitol. The significance of this work is that genes of related structure and functions are being used in diverse organisms to fulfil stress related biological requirements. | |||
==About this Structure== | ==About this Structure== | ||
2BGQ is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Hordeum_vulgare Hordeum vulgare] with <scene name='pdbligand=SO4:'>SO4</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Active as [http://en.wikipedia.org/wiki/Aldehyde_reductase Aldehyde reductase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.1.1.21 1.1.1.21] Known structural/functional Site: <scene name='pdbsite=AC1: | 2BGQ is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Hordeum_vulgare Hordeum vulgare] with <scene name='pdbligand=SO4:'>SO4</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Active as [http://en.wikipedia.org/wiki/Aldehyde_reductase Aldehyde reductase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.1.1.21 1.1.1.21] Known structural/functional Site: <scene name='pdbsite=AC1:Binding+Site+For+Residue+So4+A+1321'>AC1</scene>. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2BGQ OCA]. | ||
==Reference== | |||
An ABA and GA modulated gene expressed in the barley embryo encodes an aldose reductase related protein., Bartels D, Engelhardt K, Roncarati R, Schneider K, Rotter M, Salamini F, EMBO J. 1991 May;10(5):1037-43. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=1827067 1827067] | |||
[[Category: Aldehyde reductase]] | [[Category: Aldehyde reductase]] | ||
[[Category: Hordeum vulgare]] | [[Category: Hordeum vulgare]] | ||
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[[Category: apoenzyme]] | [[Category: apoenzyme]] | ||
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri Mar 14 09:41:52 2008'' | ||
Revision as of 10:41, 14 March 2008
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APO ALDOSE REDUCTASE FROM BARLEY
OverviewOverview
In most higher plants a period of desiccation is the terminal event in embryogenesis. Excised barley embryos acquire desiccation tolerance at a precise developmental stage and cDNA clones have been isolated which are temporally linked with desiccation tolerance. One such clone (pG22-69) with a putative gene product of 34 kd displays high structural homology to mammalian genes encoding an NADPH dependent aldose reductase involved in the synthesis of sorbitol. This first aldose reductase gene of plants is expressed constitutively during embryo maturation and is modulated by the plant hormones abscisic acid (ABA) and gibberellic acid (GA). Immunohistochemistry showed that the protein is preferentially expressed in tissues formed at early stages in embryogenesis. Measurements of enzymatic activity indicate that pG22-69 encodes an active aldose reductase. The finding of this reductase activity and the cloning of the corresponding gene supports the existence of a metabolic pathway in plants playing a role in the synthesis of osmolytes like sorbitol. The significance of this work is that genes of related structure and functions are being used in diverse organisms to fulfil stress related biological requirements.
About this StructureAbout this Structure
2BGQ is a Single protein structure of sequence from Hordeum vulgare with as ligand. Active as Aldehyde reductase, with EC number 1.1.1.21 Known structural/functional Site: . Full crystallographic information is available from OCA.
ReferenceReference
An ABA and GA modulated gene expressed in the barley embryo encodes an aldose reductase related protein., Bartels D, Engelhardt K, Roncarati R, Schneider K, Rotter M, Salamini F, EMBO J. 1991 May;10(5):1037-43. PMID:1827067
Page seeded by OCA on Fri Mar 14 09:41:52 2008