I've started reading about the recombinase polymerase amplification (RPA). I'm learning that in RPA, recombinase enzyme binds to primers, then makes them anneal to the complementary target DNA strand, and the displaced strand of DNA is bound by single-strand binding protein (SSBP) to prevent reannealing and promote extension of the bound primer. But why aren'thow come the primers aren't bound by SSBP, thus preventing them being bound by the recombinase? Why is itHow come it's not recombinase that binds the displaced DNA strand? Materials that I'm reading don't mention anything about adding some kind of recombinase-recognised tags to the primer sequence.
What determines which single-stranded DNAsequences, how do these two enzymes "know" which single stranded DNA to bind to?