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lüll Characterization of the gene encoding the largest subunit of Plasmodium falciparum RNA polymerase III Li WB; Bzik DJ; Tanaka M; Gu HM; Fox BA; Inselburg JMol Biochem Parasitol 1991[Jun]; 46 (2): 229-39We report here the isolation, sequence analysis, structure, and expression of the gene encoding the largest subunit of RNA polymerase III (RPIII) from Plasmodium falciparum. The P. falciparum RPIII gene consists of 5 exons and 4 introns, is expressed in all of the asexual erythrocytic stages of the parasite as a 8.5-kb mRNA, and is present in a single copy on chromosome 13. The predicted 2339 amino acid residue RPIII subunit contained 5 regions that were conserved between different eukaryotic RPIII subunits, and 4 variable regions that separated the conserved regions. Three of the variable regions were greatly enlarged in comparison to the corresponding variable regions in other RPIII subunits. Variable region C' represented nearly one-third of the P. falciparum RPIII subunit (750 amino acid residues), included a unique repeated decapeptide sequence, and had some homology with yeast DNA topoisomerase II. Noteworthy amino acid sequences and structures were identified in both the conserved regions and in the enlarged variable regions, and their possible role(s) as domains that regulate RPIII enzyme activity is discussed.|Amino Acid Sequence[MESH]|Animals[MESH]|Base Sequence[MESH]|Blotting, Northern[MESH]|Chromosome Mapping[MESH]|DNA Topoisomerases, Type II/genetics[MESH]|Electrophoresis[MESH]|Exons[MESH]|Gene Expression/physiology[MESH]|Introns[MESH]|Molecular Sequence Data[MESH]|Plasmodium falciparum/enzymology/*genetics/immunology[MESH]|RNA Polymerase III/chemistry/*genetics/isolation & purification/metabolism[MESH]|Sequence Alignment[MESH] |