SCR Gate to negative
To a degree...  small-signal SCR potentially can be force commutated with a large negative gate current but that doesn't make them GTO's, neither is it advisable. 



An SCR is basically an PNPN stack but there is a bit more to it, especially the specifics of doping.



The lightly doping and higher doping regions helps determine the effectiveness of "emitting minority carriers" &amp; likewise to sweep them up. 

In a GTO the gate is heavily doped to facilitate suppressing the injection from the cathode once a negative pulse is provided. This will cut off the flow of charge and turn the device off. There is also interdigitated finger structures in the CATHODE and GATE to help facilitate this. 

The device you are looking at is a VERY VERY low power SCR on the grand scale of things 0.8A and it only needs a gate current of 50uA. If you provide a large enough negative gate pulse you are quite likely going to cause a very similar effect that is seen in GTO - cut off the flow of charge from the CATHODE to the intermediate N- layer. 

However... this will not scale and once you enter power devices (not these small signal devices) you are more likely to burn out the gate before even experiencing any forced-commuted event. Likewise because of the lower doping concentration the equivelent turn-off speed will be alot slower and thus the switching speed will be drawn out.