Step 2:Controlling the Rotation of flagellum Attractants Transducer(MCP) ATP CheW CheA CheA +CH3 -Flagellar motor heB CheB CheY CheY-P CheZ CH3 Cytoplasmic membrane Cell wall 国 CheY-P binding to motor switch:clockwise rotation-tumble CheY-P结合于马达开关则鞭毛 顺时针转动（翻滚）： No CheY-P binding:counterclockwise rotation-smooth swimming 无ChY-P时则鞭毛逆时针 转动向前游)： 国 CheZ dephosphorylates CheY-P CheZ对CheY-P脱磷酸化.Step 2: Controlling the Rotation of flagellum CheY-P binding to motor switch: clockwise rotation-tumble CheY-P结合于马达开关则鞭毛 顺时针转动(翻滚); No CheY-P binding: counterclockwise rotation-smooth swimming 无ChY-P时则鞭毛逆时针 转动(向前游); CheZ dephosphorylates CheY-P CheZ对CheY-P脱磷酸化