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231225s2017 xx |||||o 00| ||eng c |
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|a 10.1093/jxb/erx196
|2 doi
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|a pubmed24n1334.xml
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|a (DE-627)NLM275316467
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|a (NLM)28859374
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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1 |
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|a Mangel, Nathalie
|e verfasserin
|4 aut
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|a Vitamin B1 diversity and characterization of biosynthesis genes in cassava
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|c 2017
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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 22.02.2018
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|a Date Revised 18.03.2024
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|a published: Print
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|a Citation Status MEDLINE
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|a © The Author 2017. Published by Oxford University Press on behalf of the Society for Experimental Biology.
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|a Vitamin B1, which consists of the vitamers thiamin and its phosphorylated derivatives, is an essential micronutrient for all living organisms because it is required as a metabolic cofactor in several enzymatic reactions. Genetic diversity of vitamin B1 biosynthesis and accumulation has not been investigated in major crop species other than rice and potato. We analyzed cassava germplasm for accumulation of B1 vitamers. Vitamin B1 content in leaves and roots of 41 cassava accessions showed significant variation between accessions. HPLC analyses of B1 vitamers revealed distinct profiles in cassava leaves and storage roots, with nearly equal relative levels of thiamin pyrophosphate and thiamin monophosphate in leaves, but mostly thiamin pyrophosphate in storage roots. Unusually, the cassava genome has two genes encoding the 4-amino-2-methyl-5-hydroxymethylpyrimidine phosphate synthase, THIC (MeTHIC1 and MeTHIC2), both of which carry a riboswitch in the 3'-UTR, as well as the adenylated thiazole synthase, THI1 (MeTHI1a and MeTHI1b). The THIC and THI1 genes are expressed at very low levels in storage roots compared with the accumulation of vitamin B1, indicating only limited biosynthesis de novo therein. In leaves, vitamin B1 content is negatively correlated with THIC and THI1 expression levels, suggesting post-transcriptional regulation of THIC by the riboswitch present in the 3'-UTR of the THIC mRNA and regulation of THI1 by promoter activity or alternative post-transcriptional mechanisms
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Cassava
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|a crop
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|a diversity
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|a riboswitch
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|a vitamers
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|a vitamin B1
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|a Thiamine
|2 NLM
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|a X66NSO3N35
|2 NLM
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| 700 |
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|a Fudge, Jared B
|e verfasserin
|4 aut
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| 700 |
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|a Fitzpatrick, Teresa B
|e verfasserin
|4 aut
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| 700 |
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|a Gruissem, Wilhelm
|e verfasserin
|4 aut
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| 700 |
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|a Vanderschuren, Hervé
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Journal of experimental botany
|d 1985
|g 68(2017), 13 vom: 15. Juni, Seite 3351-3363
|w (DE-627)NLM098182706
|x 1460-2431
|7 nnns
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| 773 |
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|g volume:68
|g year:2017
|g number:13
|g day:15
|g month:06
|g pages:3351-3363
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|u http://dx.doi.org/10.1093/jxb/erx196
|3 Volltext
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|d 68
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|h 3351-3363
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