Cloning and characterization of a putative calcium-transporting ATPase gene from Schistosoma mansoni.
Complementary DNA was isolated, encoding a putative Ca(2+)-transport ATPase (SMA1) of the human parasitic trematode Schistosoma mansoni. The cDNA was isolated by a nested polymerase chain reaction based strategy. The oligonucleotides used were designed on the basis of conserved amino-acid regions found in P-type ATPases. The complete nucleotide sequence was determined. The primary structure and topology of the enzyme were deduced. SMA1 has 1022 amino acids and a predicted molecular mass of 113 kDa. This protein is 67% identical and phylogenetically related to several sarco/endoplasmic reticulum Ca(2+)-ATPases but lacks the phospholamban-binding domain that exists in the SERCA isoforms 1 and 2. The membrane topology predicted for SMA1 is characteristic of the P-type ATPases, showing two major cytoplasmic loops and ten conserved hydrophobic segments. Sequences and residues that are important for the function of the SER Ca(2+)-ATPase, such as the high-affinity Ca(2+)-binding sites, the putative fluorescein isothiocyanate binding site, the 5'-(p-fluorosulfonyl)benzoyladenosine binding site and the aspartyl phosphorylation site, are conserved in SMA1, suggesting that the cloned gene is a Ca(2+)-transport ATPase of the SERCA family. In addition, three PCR products were cloned which share homology with another SER Ca(2+)-ATPase, with the yeast secretory pathway Ca(2+)-ATPase PMR1 and its mammalian homologue, and with the alpha subunit of a Na+,K(+)-ATPase.
Université Catholique de Louvain, Unité de Biochimie Physiologique, Louvain-la-Neuve, Belgium.
R L
RL
de Mendonça
E
E
Beck
F D
FD
Rumjanek
A
A
Goffeau
D000251:Adenosine Triphosphatases / Q000737:chemistry / Q000145:classification; D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D003001:Cloning, Molecular; D006224:Cricetinae; D018076:DNA, Complementary / Q000235:genetics; D018509:DNA, Helminth / Q000235:genetics*; D017238:Genes, Helminth; D015801:Helminth Proteins / Q000235:genetics*; D006801:Humans; D008969:Molecular Sequence Data; D016133:Polymerase Chain Reaction; D051381:Rats; D012550:Schistosoma mansoni / Q000201:enzymology / Q000235:genetics*; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid; D013045:Species Specificity
D018076:DNA, Complementary; D018509:DNA, Helminth; D015801:Helminth Proteins; D000251:Adenosine Triphosphatases