1995
DOI: 10.1016/1011-1344(94)07098-9
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Fluorescence and absorption spectroscopic properties of RNA 5′-cap analogues derived from 7-methyl-, N2,7-dimethyl- and N2,N2,7-trimethyl-guanosines

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Cited by 32 publications
(34 citation statements)
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“…Charge on the monophosphate group is essential: a 5´-monophosphate methyl ester influences the acidity less than a dianionic monophosphate group. It may, hence, be suggested that the increase of pK a values upon 5´-phosphorylation results, at least partially, from an electrostatic interaction between the phosphate and the cationic base [20]. Consistent with such an interaction, 7-methyl group slightly decreases the pK a of the phosphate group of 7-methylguanosine 5´-monophosphate (2a), whereas a similar effect is not observed with guanosine 5´-monophosphate (2b) [21].…”
Section: Structure and Interactions Of 5´-cap And 7-methylguanine Nucmentioning
confidence: 78%
“…Charge on the monophosphate group is essential: a 5´-monophosphate methyl ester influences the acidity less than a dianionic monophosphate group. It may, hence, be suggested that the increase of pK a values upon 5´-phosphorylation results, at least partially, from an electrostatic interaction between the phosphate and the cationic base [20]. Consistent with such an interaction, 7-methyl group slightly decreases the pK a of the phosphate group of 7-methylguanosine 5´-monophosphate (2a), whereas a similar effect is not observed with guanosine 5´-monophosphate (2b) [21].…”
Section: Structure and Interactions Of 5´-cap And 7-methylguanine Nucmentioning
confidence: 78%
“…The emission maximum was found to red-shift relative to that of free L-tryptophan, which might be caused by the change of microenvironments around the fluorophores (38). The absorption spectra of different nucleotides are well known to overlap considerably with the absorption spectra of the three fluorescent amino acids (33,39,40) leading to significant inner filter effect. Therefore the absorption spectra of different potential nucleotides to be used in the binding experiments were measured at relevant concentrations, in search of an alternative excitation wavelength for the recombinant proteins.…”
Section: Resultsmentioning
confidence: 99%
“…Decreasing affinity for phosphorylated eIF4E K as (phos)/ K as (wt) [%] versus negative charge of the cap analogs. The resultant charges at given pH were estimated from the experimental pK a1 values for dissociation of the N1 proton at of 7-methyloguanosine (Rhoads et al 1983;Wieczorek et al 1995), and from the experimental pK a2 values for dissociation of the second proton of the terminal phosphate group in the mononucleotide cap analogs (Dawson et al 1969). …”
Section: Discussionmentioning
confidence: 99%