Molecular and functional characterization of a novel chromoplast-specific lycopene beta-cyclase from Citrus and its relation to lycopene accumulation.
Identifieur interne : 000993 ( PubMed/Curation ); précédent : 000992; suivant : 000994Molecular and functional characterization of a novel chromoplast-specific lycopene beta-cyclase from Citrus and its relation to lycopene accumulation.
Auteurs : Berta Alquézar [Espagne] ; Lorenzo Zacarías ; María J. RodrigoSource :
- Journal of experimental botany [ 1460-2431 ] ; 2009.
English descriptors
- KwdEn :
- Amino Acid Sequence, Carotenoids (metabolism), Citrus (chemistry), Citrus (classification), Citrus (enzymology), Citrus (genetics), Gene Expression Regulation, Plant, Intramolecular Lyases (chemistry), Intramolecular Lyases (genetics), Intramolecular Lyases (metabolism), Molecular Sequence Data, Phylogeny, Plant Proteins (chemistry), Plant Proteins (genetics), Plant Proteins (metabolism), Plastids (chemistry), Plastids (enzymology), Plastids (genetics), Sequence Alignment.
- MESH :
- chemical , chemistry : Intramolecular Lyases, Plant Proteins.
- chemical , genetics : Intramolecular Lyases, Plant Proteins.
- chemical , metabolism : Carotenoids, Intramolecular Lyases, Plant Proteins.
- chemistry : Citrus, Plastids.
- classification : Citrus.
- enzymology : Citrus, Plastids.
- genetics : Citrus, Plastids.
- Amino Acid Sequence, Gene Expression Regulation, Plant, Molecular Sequence Data, Phylogeny, Sequence Alignment.
Abstract
Carotenoids are the main pigments responsible of the colouration of Citrus fruits. The beta-cyclization of lycopene, catalysed by the lycopene beta-cyclases (beta-LCY), seems to be a key regulatory step of the carotenoid pathway. In the present study, two beta-LCYs from orange fruits (Citrus sinensis), named Csbeta-LCY1 and Csbeta-LCY2 have been isolated and the activity of the encoded proteins was demonstrated by functional analysis. Csbeta-LCY1 was expressed at low levels and remained relatively constant during fruit ripening while Csbeta-LCY2 showed a chromoplast-specific expression and a marked induction in both peel and pulp of orange fruits in parallel with the accumulation of beta,beta-xanthophylls. The potential involvement of Csbeta-LCY2 in the accumulation of lycopene, characteristic of some Citrus species such as red grapefruits, was investigated. Expression of Csbeta-LCY2 and another seven carotenoid biosynthetic genes were studied in the peel and pulp of the high lycopene-accumulating grapefruit, Star Ruby, and compared with those of ordinary Navel orange. In Star Ruby, the accumulation of lycopene during fruit maturation was associated with a substantial reduction in the expression of both beta-LCY2 and beta-CHX genes with respect to Navel orange. Moreover, two different alleles of beta-LCY2: beta-LCY2a and beta-LCY2b were isolated from both genotypes, and functional assays demonstrated that the lycopene beta-cyclase activity of the allele b was almost null. Interestingly, Star Ruby grapefruit predominantly expressed the unfunctional beta-LCY2b allele during fruit ripening whereas Navel oranges preferably expressed the functional allele. It is suggested that the presence of diverse alleles of the beta-LCY2 gene, encoding enzymes with altered activity, with different transcript accumulation may be an additional regulatory mechanism of carotenoid synthesis involved in the accumulation of lycopene in red grapefruits.
DOI: 10.1093/jxb/erp048
PubMed: 19325166
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Rodrigo</name></author></analytic><series><title level="j">Journal of experimental botany</title><idno type="eISSN">1460-2431</idno><imprint><date when="2009" type="published">2009</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Amino Acid Sequence</term><term>Carotenoids (metabolism)</term><term>Citrus (chemistry)</term><term>Citrus (classification)</term><term>Citrus (enzymology)</term><term>Citrus (genetics)</term><term>Gene Expression Regulation, Plant</term><term>Intramolecular Lyases (chemistry)</term><term>Intramolecular Lyases (genetics)</term><term>Intramolecular Lyases (metabolism)</term><term>Molecular Sequence Data</term><term>Phylogeny</term><term>Plant Proteins (chemistry)</term><term>Plant Proteins (genetics)</term><term>Plant Proteins (metabolism)</term><term>Plastids (chemistry)</term><term>Plastids (enzymology)</term><term>Plastids (genetics)</term><term>Sequence Alignment</term></keywords><keywords scheme="MESH" type="chemical" qualifier="chemistry" xml:lang="en"><term>Intramolecular Lyases</term><term>Plant Proteins</term></keywords><keywords scheme="MESH" type="chemical" qualifier="genetics" xml:lang="en"><term>Intramolecular Lyases</term><term>Plant Proteins</term></keywords><keywords scheme="MESH" type="chemical" qualifier="metabolism" xml:lang="en"><term>Carotenoids</term><term>Intramolecular Lyases</term><term>Plant Proteins</term></keywords><keywords scheme="MESH" qualifier="chemistry" xml:lang="en"><term>Citrus</term><term>Plastids</term></keywords><keywords scheme="MESH" qualifier="classification" xml:lang="en"><term>Citrus</term></keywords><keywords scheme="MESH" qualifier="enzymology" xml:lang="en"><term>Citrus</term><term>Plastids</term></keywords><keywords scheme="MESH" qualifier="genetics" xml:lang="en"><term>Citrus</term><term>Plastids</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Amino Acid Sequence</term><term>Gene Expression Regulation, Plant</term><term>Molecular Sequence Data</term><term>Phylogeny</term><term>Sequence Alignment</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Carotenoids are the main pigments responsible of the colouration of Citrus fruits. The beta-cyclization of lycopene, catalysed by the lycopene beta-cyclases (beta-LCY), seems to be a key regulatory step of the carotenoid pathway. In the present study, two beta-LCYs from orange fruits (Citrus sinensis), named Csbeta-LCY1 and Csbeta-LCY2 have been isolated and the activity of the encoded proteins was demonstrated by functional analysis. Csbeta-LCY1 was expressed at low levels and remained relatively constant during fruit ripening while Csbeta-LCY2 showed a chromoplast-specific expression and a marked induction in both peel and pulp of orange fruits in parallel with the accumulation of beta,beta-xanthophylls. The potential involvement of Csbeta-LCY2 in the accumulation of lycopene, characteristic of some Citrus species such as red grapefruits, was investigated. Expression of Csbeta-LCY2 and another seven carotenoid biosynthetic genes were studied in the peel and pulp of the high lycopene-accumulating grapefruit, Star Ruby, and compared with those of ordinary Navel orange. In Star Ruby, the accumulation of lycopene during fruit maturation was associated with a substantial reduction in the expression of both beta-LCY2 and beta-CHX genes with respect to Navel orange. Moreover, two different alleles of beta-LCY2: beta-LCY2a and beta-LCY2b were isolated from both genotypes, and functional assays demonstrated that the lycopene beta-cyclase activity of the allele b was almost null. Interestingly, Star Ruby grapefruit predominantly expressed the unfunctional beta-LCY2b allele during fruit ripening whereas Navel oranges preferably expressed the functional allele. It is suggested that the presence of diverse alleles of the beta-LCY2 gene, encoding enzymes with altered activity, with different transcript accumulation may be an additional regulatory mechanism of carotenoid synthesis involved in the accumulation of lycopene in red grapefruits.</div></front></TEI><pubmed><MedlineCitation Status="MEDLINE" Owner="NLM"><PMID Version="1">19325166</PMID><DateCreated><Year>2009</Year><Month>4</Month><Day>23</Day></DateCreated><DateCompleted><Year>2009</Year><Month>07</Month><Day>06</Day></DateCompleted><DateRevised><Year>2014</Year><Month>12</Month><Day>10</Day></DateRevised><Article PubModel="Print-Electronic"><Journal><ISSN IssnType="Electronic">1460-2431</ISSN><JournalIssue CitedMedium="Internet"><Volume>60</Volume><Issue>6</Issue><PubDate><Year>2009</Year></PubDate></JournalIssue><Title>Journal of experimental botany</Title><ISOAbbreviation>J. Exp. Bot.</ISOAbbreviation></Journal><ArticleTitle>Molecular and functional characterization of a novel chromoplast-specific lycopene beta-cyclase from Citrus and its relation to lycopene accumulation.</ArticleTitle><Pagination><MedlinePgn>1783-97</MedlinePgn></Pagination><ELocationID EIdType="doi" ValidYN="Y">10.1093/jxb/erp048</ELocationID><Abstract><AbstractText>Carotenoids are the main pigments responsible of the colouration of Citrus fruits. The beta-cyclization of lycopene, catalysed by the lycopene beta-cyclases (beta-LCY), seems to be a key regulatory step of the carotenoid pathway. In the present study, two beta-LCYs from orange fruits (Citrus sinensis), named Csbeta-LCY1 and Csbeta-LCY2 have been isolated and the activity of the encoded proteins was demonstrated by functional analysis. Csbeta-LCY1 was expressed at low levels and remained relatively constant during fruit ripening while Csbeta-LCY2 showed a chromoplast-specific expression and a marked induction in both peel and pulp of orange fruits in parallel with the accumulation of beta,beta-xanthophylls. The potential involvement of Csbeta-LCY2 in the accumulation of lycopene, characteristic of some Citrus species such as red grapefruits, was investigated. Expression of Csbeta-LCY2 and another seven carotenoid biosynthetic genes were studied in the peel and pulp of the high lycopene-accumulating grapefruit, Star Ruby, and compared with those of ordinary Navel orange. In Star Ruby, the accumulation of lycopene during fruit maturation was associated with a substantial reduction in the expression of both beta-LCY2 and beta-CHX genes with respect to Navel orange. Moreover, two different alleles of beta-LCY2: beta-LCY2a and beta-LCY2b were isolated from both genotypes, and functional assays demonstrated that the lycopene beta-cyclase activity of the allele b was almost null. Interestingly, Star Ruby grapefruit predominantly expressed the unfunctional beta-LCY2b allele during fruit ripening whereas Navel oranges preferably expressed the functional allele. It is suggested that the presence of diverse alleles of the beta-LCY2 gene, encoding enzymes with altered activity, with different transcript accumulation may be an additional regulatory mechanism of carotenoid synthesis involved in the accumulation of lycopene in red grapefruits.</AbstractText></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Alquézar</LastName><ForeName>Berta</ForeName><Initials>B</Initials><AffiliationInfo><Affiliation>Instituto de Agroquímica y Tecnología de Alimentos (IATA), Consejo Superior de Investigaciones Científicas (CSIC), Valencia, Spain.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Zacarías</LastName><ForeName>Lorenzo</ForeName><Initials>L</Initials></Author><Author ValidYN="Y"><LastName>Rodrigo</LastName><ForeName>María J</ForeName><Initials>MJ</Initials></Author></AuthorList><Language>ENG</Language><PublicationTypeList><PublicationType UI="D016428">Journal Article</PublicationType><PublicationType 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UI="C015329">lycopene</NameOfSubstance></Chemical></ChemicalList><CitationSubset>IM</CitationSubset><CommentsCorrectionsList><CommentsCorrections RefType="Cites"><RefSource>Biochem Soc Trans. 2000 Dec;28(6):806-10</RefSource><PMID Version="1">11171215</PMID></CommentsCorrections><CommentsCorrections RefType="Cites"><RefSource>FEBS Lett. 2000 Nov 24;485(2-3):168-72</RefSource><PMID Version="1">11094161</PMID></CommentsCorrections><CommentsCorrections RefType="Cites"><RefSource>Curr Opin Plant Biol. 2001 Jun;4(3):210-8</RefSource><PMID Version="1">11312131</PMID></CommentsCorrections><CommentsCorrections RefType="Cites"><RefSource>J Agric Food Chem. 2001 May;49(5):2563-8</RefSource><PMID Version="1">11368636</PMID></CommentsCorrections><CommentsCorrections RefType="Cites"><RefSource>J Biol Chem. 2001 Jul 6;276(27):25208-11</RefSource><PMID Version="1">11316814</PMID></CommentsCorrections><CommentsCorrections RefType="Cites"><RefSource>Biosci Biotechnol Biochem. 2001 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