TY - JOUR
T1 - Schistosoma mansoni
T2 - Cloning and characterization of a gene encoding cytosolic cu/zn superoxide-dismutase
AU - Mei, Haiping
AU - Hirai, Hirohisa
AU - Tanaka, Manami
AU - LoVerde, Philip T.
AU - Hong, Zhi
AU - Rekosh, David
PY - 1995/3
Y1 - 1995/3
N2 - Two forms of Cu/Zn superoxide dismutase (SOD) have been identified in Schistosoma mansoni, signal peptide containing SOD (SP-SOD, Simurda et al., 1988, Exp. Parasitol.67, 73-84) and cytosolic SOD (CT-SOD, Hong et al., 1992, Exp. Parasitol.75, 308-322). The SP-SOD gene has been previously characterized. We report the isolation and characterization of the gene encoding CT-SOD. A cDNA clone of CT-SOD was radiolabeled and used to screen an EMBL3 genomic library. Of 100,000 plaques, 1 hybridizing phage contained an insert of 14.6 kb. The CT-SOD gene spans 8.5 kb of chromosomal DNA and possesses three exons (150, 285, and 234 bp, respectively) and two introns (4.9 and 2.7 kb, respectively) which interrupt the coding region. Separate copies of the gene as determined by restriction fragment patterns on Southern blots are found on two YAC clones. Using YAC clones that contain the CT-SOD gene, fluorescence in situ hybridization on chromosomes identified a copy of the gene located on the middle region of chromosome 1 and another copy localized to the middle region of the long arm of chromosome 3. Primer extension and nuclease protection assay performed on total RNA define the transcription initiation site and allow the identification of potential cis-acting sequences, such as a CAAT box and a hexanucleotide GCCCGG. Comparison of this gene with Cu/Zn SOD genes from Drosophila, humans, and mice identifies conserved exons that represent functional domains in the SOD protein.
AB - Two forms of Cu/Zn superoxide dismutase (SOD) have been identified in Schistosoma mansoni, signal peptide containing SOD (SP-SOD, Simurda et al., 1988, Exp. Parasitol.67, 73-84) and cytosolic SOD (CT-SOD, Hong et al., 1992, Exp. Parasitol.75, 308-322). The SP-SOD gene has been previously characterized. We report the isolation and characterization of the gene encoding CT-SOD. A cDNA clone of CT-SOD was radiolabeled and used to screen an EMBL3 genomic library. Of 100,000 plaques, 1 hybridizing phage contained an insert of 14.6 kb. The CT-SOD gene spans 8.5 kb of chromosomal DNA and possesses three exons (150, 285, and 234 bp, respectively) and two introns (4.9 and 2.7 kb, respectively) which interrupt the coding region. Separate copies of the gene as determined by restriction fragment patterns on Southern blots are found on two YAC clones. Using YAC clones that contain the CT-SOD gene, fluorescence in situ hybridization on chromosomes identified a copy of the gene located on the middle region of chromosome 1 and another copy localized to the middle region of the long arm of chromosome 3. Primer extension and nuclease protection assay performed on total RNA define the transcription initiation site and allow the identification of potential cis-acting sequences, such as a CAAT box and a hexanucleotide GCCCGG. Comparison of this gene with Cu/Zn SOD genes from Drosophila, humans, and mice identifies conserved exons that represent functional domains in the SOD protein.
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U2 - 10.1006/expr.1995.1031
DO - 10.1006/expr.1995.1031
M3 - Article
C2 - 7895835
AN - SCOPUS:0028919936
SN - 0014-4894
VL - 80
SP - 250
EP - 259
JO - Experimental Parasitology
JF - Experimental Parasitology
IS - 2
M1 - 71031
ER -