title: Inhibition of reverse transcriptases by seminalplasmin.
abstract: Seminalplasmin, an antibacterial protein present in bovine seminal plasma, is shown to be a potent inhibitor of reverse transcriptases (RNA-dependent DNA nucleotidyltransferases). Seminalplasmin inhibits RNA-directed, hybrid-directed, and DNA-directed DNA-polymerizing activities of purified reverse transcriptase from avian myeloblastosis virus and from crude viral lysates of several retroviruses by binding to the enzyme, at least in the case of avian myeloblastosis virus. Seminalplasmin does not inhibit significantly DNA synthesis either by Escherichia coli DNA polymerase I, or a mammalian alpha-DNA polymerase. The presence of seminalplasmin in the seminal fluid could provide protection to the male and/or the female reproductive tract against retroviruses.
mesh_terms: D009189:Avian Myeloblastosis Virus / Q000201:enzymology; D004247:DNA / Q000096:biosynthesis; D011119:Polynucleotides / Q000378:metabolism; D011506:Proteins / Q000494:pharmacology*; D012333:RNA, Messenger / Q000378:metabolism; D012190:Retroviridae / Q000378:metabolism; D018894:Reverse Transcriptase Inhibitors; D029607:Seminal Vesicle Secretory Proteins; D014158:Transcription, Genetic / Q000187:drug effects
chemical_list: D011119:Polynucleotides; D011506:Proteins; D012333:RNA, Messenger; D018894:Reverse Transcriptase Inhibitors; D029607:Seminal Vesicle Secretory Proteins; D004247:DNA