Molecular analysis of genes involved in carbohydrate metabolism in the desiccation-tolerant cyanobacterium Nostoc commune UTEX 584
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Sequence analysis of DNA from the second cross reactive clone revealed six ORFs (ORFs 1 through 6).The products of ORFI and ORF2 are overproduced in this clone. The polypeptide encoded by ORFI shows very strong cross-reactivity with the polyclonal Wsp antibody, whereas ORF2 does not. Database searches using the deduced amino acid sequences of the six ORFs have provided clues to the possible identities of these ORFs. ORF6 shows correspondence with a protein, in Arabidopsis thaliana, which is induced in response to cold, abscissic acid and water stress. The common feature shared by ORFs 1 to 5 is that the highest similarities are observed with enzymes involved in carbohydrate metabolism. ORFs 1 through 5 may possibly represent a novel cluster of genes that form all or part of an operon involved in the metabolism of carbohydrates in Nostoc 584.
Fructose bisphosphate aldolase (EC 18.104.22.168) is a key enzyme in carbohydrate metabolism, playing a role in glycolysis as well in the Calvin cycle of carbon dioxide fixation. The potential roles played by aldolase and the products of ORFs 1 through 5 in overall carbon metabolism of Nostoc commune UTEX 584 are discussed.
- Doctoral Dissertations