No, at least not directly.
What you can do is take the Magic Kingdom bus from PC, then the monorail (or Ferryboat) from MK over to the Transportation & Ticket Center (TTC). From the TTC, you can get a Lynx bus (Lynx is Orlando public transit) directly to Sea World. Universal & IOA would require a change of buses. You can get that information from the Lynx website -
http://www.golynx.com
It's certainly the most economical way to get there, and the Sea World bus drops you off conveniently (I don't know where the Universal stop is located) at the front parking lot. On the downside, Universal would require three buses - 2 Lynx & 1 Disney - in addition to a monorail ride to get there from PC. Again, Sea World is somewhat more convenient.