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Cloning and characterization of the gene encoding pyruvate phosphate dikinase from Giardia duodenalis



Cloning and characterization of the gene encoding pyruvate phosphate dikinase from Giardia duodenalis



Molecular and Biochemical Parasitology 77(2): 225-233



This paper reports the cloning and molecular characterization of the gene encoding pyruvate phosphate dikinase (PPDK) from Giardia. The ORF is 2652 nucleotide residues in length and not interrupted by introns. The gene appears to exist as a single copy in the genome and predicts a 97629 Da protein containing 884 amino acid residues. Comparison of the deduced Giardia PPDK sequence with those of homologous enzymes from other organisms revealed high sequence similarities and the presence of various conserved domains known to be essential for substrate binding and catalysis. Analysis of the ppdk gene and 19 other protein-coding genes from the protist revealed no typical TATA boxes, positioned at around -30, but the presence of two novel consensus sequence motifs in the 5' flanking regions. One is an AT-rich element immediately preceding the translation initiation codon and the other a 14-bp box centered at -30. These shared consensus sequence patterns present in the 5' flanking region of Giardia genes are suggested to play a role in the control of transcription initiation.

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Accession: 045548671

Download citation: RISBibTeXText

PMID: 8813668

DOI: 10.1016/0166-6851(96)02605-9


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