Structural genes for Mg-chelatase subunits in barley:Xantha-f, -g and-h View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1996-03

AUTHORS

P. E. Jensen, B. Larsen Petersen, B. M. Stummann, K. W. Henningsen, R. D. Willows, U. C. Vothknecht, C. G. Kannangara, D. von Wettstein

ABSTRACT

Barley mutants in the loci Xantha-f, Xantha-g and Xantha-h, when fed with 5-aminolevulinate in the dark, accumulate protoporphyrin IX. Mutant alleles at these loci that are completely blocked in protochlorophyllide synthesis are also blocked in development of prolamellar bodies in etioplasts. In contrast to wild type, the xan-f, -g and -h mutants had no detectable Mg-chelatase activity, whereas they all had methyltransferase activity for synthesis of Mg-protoporphyrin monomethyl ester. Antibodies recognising the CH42 protein of Arabidopsis thaliana and the OLIVE (OLI) protein of Antirrhinum majus immunoreacted in wild-type barley with 42 and 150 kDa proteins, respectively. The xan-h mutants lacked the protein reacting with antibodies raised against the CH42 protein. Two xan-f mutants lacked the 150 kDa protein recognised by the anti-OLI antibody. Barley genes homologous to the A. majus olive and the A. thaliana Ch-42 genes were cloned using PCR and screening of cDNA and genomic libraries. Probes for these genes were applied to Northern blots of RNA from the xantha mutants and confirmed the results of the Western analysis. The mutants xan-f27, -f40, -h56 and -h57 are defective in transcript accumulation while -h38 is defective in translation. Southern blot analysis established that h38 has a deletion of part of the gene. Mutants xan-f10 and -f41 produce both transcript and protein and it is suggested that these mutations are in the catalytic sites of the protein. It is concluded that X an-f -h genes encode two subunits of the barley Mg-chelatase and that X an-g is likely to encode a third subunit. The XAN-F protein displays 82% amino acid sequence identity to the OLI protein of Antirrhinum, 66% to the Synechocystis homologue and 34% identity to the Rhodobacter BchH subunit of Mg-chelatase. The XAN-H protein has 85% amino acid sequence identity to the Arabidopsis CH42 protein, 69% identity to the Euglena CCS protein, 70% identity to the Cryptomonas BchA and Olisthodiscus CssA proteins, as well as 49% identity to the Rhodobacter BchI subunit of Mg-chelatase. Identification of the barley X an-f and X an-h encoded proteins as subunits required for Mg-chelatase activity supports the notion that the Antirrhinum OLI protein and the Arabidopsis Ch42 protein are subunits of Mg-chelatase in these plants. The expression of both thet X an-f and -h genes in wild-type barley is light induced in leaves of greening seedlings, and in green tissue the genes are under the control of a circadian clock. More... »

PAGES

383-394

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf02174026

DOI

http://dx.doi.org/10.1007/bf02174026

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1005925725

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/8602155


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Turtle is a human-readable linked data format.

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RDF/XML is a standard XML format for linked data.

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