If the point charge had a negative sign, then it would attract the proton and repel the electron.
If the point charge were positive, then it would attract the electron and repel the proton.
The magnitude would be dependant on the distance between the charge and the particle, the greater the distance between the two, the weaker the effect would be .
The acceleration of the proton would be slower than that of of the electron due to its greater mass compared to the electron, regardless of direction. The direction of the proton's acceleration would be dependant on the sign of the charge; if positive then its acceleration would be away from the charge, if negative than the proton would accelerate toward the charge. Similarly(Conversely), the electron would have greater acceleration because of its smaller mass relative to the proton, regardless of direction. If the charge were negative, the electron would accelerate away from the charge. If the charge had a positive sign, then it would attract the electron.