Three proteins, BCL-G (BCL2L14), CMPK2, and LAMP3, were discovered to independently restrict HIV-1 replication both in-vivo and in-vitro. Methods are described wherein subjects are given an effective amount of a pharmaceutical composition comprising a protein selected from the group consisting of BCL-G, CMPK2, LAMP3, functional parts thereof, recombinant proteins thereof, and combinations thereof, for the purpose of treating or preventing HIV.