Yes it is load bearing, my advice is to get a structural engineer to give you some advice which will actually work. Advice from my desk chair will not help much. Kind of like when the house collapses, I can only help so much from my desk chair.
Sorry, We get this question so often and would like to help out. My feeling is for $500 bucks you can get a drawing and the correct answers instead of speculation. We would love to have the right answer and to help you out, but without actually being there and seeing what the beam is like in the basement, or the size of the footings, or the weight from upstairs walls and point loads, it would not be good advice.
Let us know what they do say, we always like to know how it turns out.