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Molecular cloning of an Onchocerca volvulus extracellular Cu-Zn superoxide dismutase.

机译:盘尾丝虫胞外Cu-Zn超氧化物歧化酶的分子克隆。

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Onchocerca volvulus, a human parasitic nematode, is the third leading cause of preventable blindness worldwide. This study describes the molecular cloning of a novel superoxide dismutase (SOD) from the parasite. This putative O. volvulus extracellular SOD (OvEcSOD) is 628 nucleotides (nt) long, including a 22-nt 5' spliced leader (SL1) and a portion encoding an N-terminal hydrophobic 42-amino-acid signal peptide. The remainder of the cDNA shares 71% identity with an O. volvulus cytosolic SOD sequence and is 3 nt longer. All residues involved in metal ion binding, active site formation, folding, and dimer formation in SODs are conserved. Data indicate the OvEcSOD and O. volvulus cytosolic SOD are separate gene products and that the OvEcSOD appears to possess the characteristics of a membrane-bound or secreted enzyme which may be involved in the parasite defense against phagocyte-generated reactive oxygen species.
机译:食人盘尾线虫(Onchocerca volvulus)是一种人类寄生线虫,是全球可预防失明的第三个主要原因。这项研究描述了从寄生虫的新型超氧化物歧化酶(SOD)的分子克隆。该推定的肠扭转单胞菌细胞外SOD(OvEcSOD)长628个核苷酸(nt),包括22个nt的5'拼接前导序列(SL1)和编码N端疏水性42个氨基酸信号肽的部分。其余的cDNA与肠螺旋体胞质SOD序列具有71%的同一性,并且长3 nt。保留了SOD中所有与金属离子结合,活性位点形成,折叠和二聚体形成有关的残基。数据表明OvEcSOD和肠螺旋体胞质SOD是独立的基因产物,OvEcSOD似乎具有膜结合或分泌酶的特征,这些酶可能参与了对吞噬细胞生成的活性氧物种的寄生虫防御。

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