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All known guanine-sensing riboswitches regulate gene expression by specifically binding to guanine (G) or related analogs with high affinity to switch off transcription. The aptamers of this class of riboswitches are characterized by three helices (P1-P3), surrounding a central core of phylogenetically conserved nucleotides and a long-range loop-loop… (More)
The replication of Hepatitis B virus is initiated by binding of its reverse transcriptase to the apical stem loop and primer loop of epsilon. Here, we present the (1)H/(13)C/(15)N NMR assignments of the bases and sugars of the 29 residues apical stem loop of Duck HBV epsilon.
Here we report the nearly complete base assignments and partial sugar assignments of the 35-residue terminator hairpin of the Bacillus subtilis xpt-pbuX-mRNA guanine sensing riboswitch.
Hepatitis B virus (HBV) replication is initiated by binding of its reverse transcriptase (P) to the apical stem-loop (AL) and primer loop (PL) of epsilon, a highly conserved RNA element at the 5'-end of the RNA pregenome. Mutation studies on duck/heron and human in vitro systems have shown similarities but also differences between their P-epsilon… (More)
S-Adenosyl-L-methionine (SAM) is the preferred cofactor for biological methyl group transfers to various substrates such as nucleic acids, proteins, and lipids. Here we present stereospecific (>95% of the desired enantiomer) and high-yield preparation of four fluorescent and biologically active SAM analogs and demonstrate their usefulness in binding… (More)