[blackbhuta]

This is parameter for MoveObject
(objectid, Float:X, Float:Y, Float:Z, Float:Speed, Float:RotX = -1000.0, Float:RotY = -1000.0, Float:RotZ = -1000.0)

So, you can try:
MoveObject(gate1, 999.79998779297, -644.90002441406, 121, [speed], [RotX], [RotY],[RotZ]);