Nucleic Acids Research, 1977, Vol. 4, No. 5 1681-1694
© 1977
Articles |
Analogs of methionyl-tRNA synthetase substrates containing photolabile groups*
Department of Molecular Biophysics and Biochemistry, Yale University New Haven, CT 06520, USA
Received January 17, 1977.
Three photolabile analogs of substrates of methionyl-tRNA synthetase were synthesized. In one, the 4-thiouridine at the 8 position of E. coli tRNAfMet was alkylated with [14C]p-azidobromoacetanilide. In the second, [14c]p-azidobenzoic acid hydrazide was condensed with the 3'-terminal dialdehyde of periodate-oxidized Escherichia coli tRNAfMet. The modified tRNAs could be purified by chromatography on benzoylated DEAE-cellulose. The third photolabile compound was [3H]methioninyl-8-azido-adenosine 5'-phosphate, an analog of the methionyl adenylate intermediate in the aminoacylation reaction. Irradiation of each of these compounds in the presence of equimolar amounts of E. coli methionyl-tRNA synthetase at pM concentrations gave 515% crosslinking.
*This paper is dedicated to the memory of Jerome Vinograd.