Unfortunately there's not much you can do if you booked the flights separately. Had you booked them all in one itinerary Turkish would have been obligated to change your "internal" flight to another more convenient connection at their expense. When you book flights separately, neither airline is obliged to change your ticket due to a schedule change on the other. This would have been the case had your Turkish flight from BKK to IST been delayed or cancelled. If you missed your "internal" flight it would be at their discretion to rebook you at no charge or charge you a fee and possibly difference in fare.
My suggestion would be to call the airline with which you booked your "internal" flight and explain the situation you now find yourself in. If the first representative you speak with is unwilling or unable to change your ticket politely ask to speak with a supervisor as they sometimes have more authority to override the rules.
If that doesn't work call Turkish back and see if they would be willing to issue a voucher for a free or discounted hotel room near the airport in Istanbul.
Finally, if all of the above fails, upon arrival in Istanbul go to the ticket counter of the airline with whom you have the "internal" flight booked. Bring a copy of your original itinerary, the e-mail showing the schedule change, and your boarding pass from the Turkish flight. Ask them if there is space available if you could go on the next flight to your destination. Agents and supervisors at the airport have much more flexibility than phone agents so if the flight on the day of your arrival isn't full they may be able to get you on it without any penalties.
Good luck and please return to post what happened.
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