Lymphatic filariasis is caused by infection with the filarial nematode
s Brugia malayi, Brugia timori, Wuchereria bancrofti and Onchocerca vo
lvulus which collectively infect about 200 million persons throughout
the world. Protein sequence homology analysis of a major nematode anti
gen suggested that it was a class II aminoacyl-tRNA synthetase. The ov
erproduction, purification and verification that the major B. malayi a
ntigen is an asparaginyl-tRNA synthetase is described.