PMID- 6097815 OWN - NLM STAT- MEDLINE DCOM- 19850314 LR - 20081121 IS - 0026-8984 (Print) IS - 0026-8984 (Linking) VI - 18 IP - 6 DP - 1984 Nov-Dec TI - [Study of the secondary and tertiary structure of phage MS2 RNA using nucleases and fluorescent dyes specific for secondary structure]. PG - 1625-33 AB - The binding of ethidium bromide (EtBr) and acridine orange (AO) to RNA in native state or after hydrolysis by S1 and SV nucleases that specifically split single-stranded and double-stranded segments was studied. Nuclease S1 hydrolysis of RNA does not increase the number of EtBr strong binding sites, Tm and hyperchromic effect being also unchanged. Hydrolysis by double-stranded segments accessible to EtBr is followed by the diminishing of Tm and hyperchromism. A supposition is put forward that the main role in stabilization of the RNA tertiary structure is played by double-stranded segments arranged so that some of them are hidden and do not interact with dyes. One of the possible models may be parallel oriented intramolecular "hair-pins" forming compact "rod-like" structures. FAU - Borisova, O F AU - Borisova OF FAU - Grechko, V V AU - Grechko VV FAU - Aleshkina, L A AU - Aleshkina LA FAU - Kuznetsova, N V AU - Kuznetsova NV LA - rus PT - English Abstract PT - Journal Article TT - Izuchenie vtorichnoi i tretichnoi struktury RNK faga MS2 s ispol'zovaniem nukleaz i fluorestsiruiushchikh krasitelei, spetsifichnykh ko vtorichnoi strukture. PL - Russia (Federation) TA - Mol Biol (Mosk) JT - Molekuliarnaia biologiia JID - 0105454 RN - 0 (Fluorescent Dyes) RN - 0 (RNA, Double-Stranded) RN - 0 (RNA, Viral) RN - EC 3.1.- (Endonucleases) RN - EC 3.1.- (Endoribonucleases) RN - EC 3.1.26.- (cobra venom endonuclease) RN - EC 3.1.30.1 (Single-Strand Specific DNA and RNA Endonucleases) SB - IM MH - *Coliphages MH - *Endonucleases MH - *Endoribonucleases MH - *Fluorescent Dyes MH - Hydrolysis MH - *Nucleic Acid Conformation MH - RNA, Double-Stranded MH - *RNA, Viral MH - Single-Strand Specific DNA and RNA Endonucleases EDAT- 1984/11/01 00:00 MHDA- 1984/11/01 00:01 CRDT- 1984/11/01 00:00 PHST- 1984/11/01 00:00 [pubmed] PHST- 1984/11/01 00:01 [medline] PHST- 1984/11/01 00:00 [entrez] PST - ppublish SO - Mol Biol (Mosk). 1984 Nov-Dec;18(6):1625-33.