title: Characterization of single stranded telomeric DNA-binding proteins in cultured soybean (Glycine max) cells.
abstract: We have identified and characterized a protein factor in soybean (Glycine max) nuclear extracts that binds to plant single stranded telomeric DNA repeats. A single DNA-protein complex was detected in gel retardation assays using synthetic telomeres and nuclear extracts. The protein forming this complex was designated soy-bean (Glycine max) single stranded telomeric DNA-binding protein (Gm-STBP). Gm-STBP binds to single stranded telomeric DNA containing more than two repeats. It does not bind to Tetrahymena, human or mutated plant telomere sequences, and its binding activity is not affected by RNase treatment. Gm-STBP activity gradually decreased after suspension cultures entered stationary phase. A slower migrating band was formed with extracts of earlier and later phases of soybean suspension cultures. Our findings suggest that binding of Gm-STBP to plant single stranded telomeric DNA may play a role in the proper functioning of telomeres during development.
authors.affiliation: Department of Biology, Yonsei University, Seoul 120-749, Korea.
authors.forename: Chian
authors.initials: C
authors.lastname: Kwon
authors.forename: Kisang
authors.initials: K
authors.lastname: Kwon
authors.forename: In Kwon
authors.initials: IK
authors.lastname: Chung
authors.forename: Soon Young
authors.initials: SY
authors.lastname: Kim
authors.forename: Myeon Haeng
authors.initials: MH
authors.lastname: Cho
authors.forename: Bin Goo
authors.initials: BG
authors.lastname: Kang
mesh_terms: D000818:Animals; D002467:Cell Nucleus / Q000378:metabolism*; D002478:Cells, Cultured; D004277:DNA, Single-Stranded / Q000378:metabolism*; D004268:DNA-Binding Proteins / Q000378:metabolism*; D006801:Humans; D009687:Nuclear Proteins / Q000378:metabolism; D010940:Plant Proteins / Q000378:metabolism; D013025:Glycine max / Q000378:metabolism*; D034501:Telomere-Binding Proteins / Q000378:metabolism*; D013768:Tetrahymena / Q000235:genetics
chemical_list: D004277:DNA, Single-Stranded; D004268:DNA-Binding Proteins; D009687:Nuclear Proteins; D010940:Plant Proteins; D034501:Telomere-Binding Proteins