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231224s2014 xx |||||o 00| ||eng c |
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|a 10.1016/j.plaphy.2014.02.004
|2 doi
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|a pubmed25n0787.xml
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|a (DE-627)NLM236202227
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|a (NLM)24607574
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|a (PII)S0981-9428(14)00048-5
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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| 100 |
1 |
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|a Braumann, Ilka
|e verfasserin
|4 aut
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|a Reduced chlorophyll biosynthesis in heterozygous barley magnesium chelatase mutants
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|c 2014
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
|b cr
|2 rdacarrier
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|a Date Completed 15.12.2014
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|a Date Revised 30.09.2020
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a Copyright © 2014 Elsevier Masson SAS. All rights reserved.
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|a Chlorophyll biosynthesis is initiated by magnesium chelatase, an enzyme composed of three proteins, which catalyzes the insertion of Mg2+ into protoporphyrin IX to produce Mg-protoporphyrin IX. In barley (Hordeum vulgare L.) the three proteins are encoded by Xantha-f, Xantha-g and Xantha-h. Two of the gene products, XanH and XanG, belong to the structurally conserved family of AAA+ proteins (ATPases associated with various cellular activities) and form a complex involving six subunits of each protein. The complex functions as an ATP-fueled motor of the magnesium chelatase that uses XanF as substrate, which is the catalytic subunit responsible for the insertion of Mg2+ into protoporphyrin IX. Previous studies have shown that semi-dominant Xantha-h mutations result in non-functional XanH subunits that participate in the formation of inactive AAA complexes. In the present study, we identify severe mutations in the barley mutants xantha-h.38, -h.56 and -h.57. A truncated form of the protein is seen in xantha-h.38, whereas no XanH is detected in xantha-h.56 and -h.57. Heterozygous mutants show a reduction in chlorophyll content by 14-18% suggesting a slight semi-dominance of xantha-h.38, -h.56 and -h.57, which otherwise have been regarded as recessive mutations
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a AAA
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|a BchI
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|a ChlI
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|a Hordeum vulgare
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|a Mg-chelatase
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|a Plant Proteins
|2 NLM
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|a Protein Subunits
|2 NLM
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|a Chlorophyll
|2 NLM
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|a 1406-65-1
|2 NLM
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|a Lyases
|2 NLM
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| 650 |
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|a EC 4.-
|2 NLM
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|a magnesium chelatase
|2 NLM
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| 650 |
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|a EC 4.99.1-
|2 NLM
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| 700 |
1 |
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|a Stein, Nils
|e verfasserin
|4 aut
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| 700 |
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|a Hansson, Mats
|e verfasserin
|4 aut
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| 773 |
0 |
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|i Enthalten in
|t Plant physiology and biochemistry : PPB
|d 1991
|g 78(2014) vom: 01. Mai, Seite 10-4
|w (DE-627)NLM098178261
|x 1873-2690
|7 nnas
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|g volume:78
|g year:2014
|g day:01
|g month:05
|g pages:10-4
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|u http://dx.doi.org/10.1016/j.plaphy.2014.02.004
|3 Volltext
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