file1:
TST_01  sp|123|fts
TST_02  sp|3438|rvs
TST_03  sp|2744|rtp

file2:
file1:
sp|123|fts  checked_proved
sp|3438|rvs  proven_right
sp|2744|rtp  un_proved

desired result file:
TST_01  sp|123|fts  checked_proved
TST_02  sp|3438|rvs  proven_right
TST_03  sp|2744|rtp  un_proved