Abstract The secondary structure of the protein of DMO and DMT in Oreochromis aureus were predicted by the methods of Garnier-Robson, Chou-Fasman and Karplus-Schulz based on the amimo acid sequences of DMO and DMT. And Hydrophilicity plot, Surface probability and Antigenic index for DMO and DMT protein were obtained by the methods of Kyte-Doolittle, Emini and Jameson-Wolf, respectively. Combined the results according to these methods, the B cell epitopes for DMO and DMT protein were predicted. The results demonstrated that there were some centers of α-helix in the DMO protein`s N- terminal No. 80~112, 144~147, 193~194, 251~255, 260~269 and No. 279~283, and in the DMT protein`s N-terminal No. 61~86, 98~105, 140~146, 239~241 and No.269~273. And there are some centers of β-sheet in the DMO protein`s N-terminal No. 59~61, 69~70, 148~150 and No.383~390, and in the DMT protein`s N-terminal No.125~129, 207~213, 255~264 and No.281~284. Furthermore, the DMO protein`s N-terminal No. 40~41, 44~45, 50~51, 128~129, 189~192, 204~207, 216~222, 226~233, 244~246, 298~299 and No.323~326, and the DMT protein`s N-termianl No.12~13, 26~27, 43~44, 58~60, 93~95, 115~120, 136~139 and No.149~151 may be the flexible regions. Moreover the B-cell epitopes possibly localized in or nearby the DMO protein`s 1~5, 41~51, 65~67, 86~89, 98~110, 154~170, 183~203, 205~248, 258~264, 284~291, 293~298, 270~375, 389~392 and No.402~410, and DMT protein`s N-termianl No.1~9, 17~28, 77~84, 114~123, 131~139, 157~184 and No.96~207.Theses results are helpful for studies on sex-control mechanism of DMO and DMT in Oreochromis aureus.
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