Identification and sequence analysis of contact sites between ribosomal proteins and rRNA in Escherichia coli 30 S subunits by a new approach using matrix-assisted laser desorption/ionization-mass spectrometry combined with N-terminal microsequencing.

The Journal of Biological Chemistry
Henning UrlaubB Wittmann-Liebold

Abstract

Cross-linked peptide-oligoribonucleotide complexes derived from distinct regions of the rRNA and individual ribosomal proteins of the 30 S ribosomal subunits from Escherichia coli were isolated and purified. Cross-linking sites at the amino acid and nucleotide level were determined by N-terminal amino acid sequence analysis in combination with matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS). MALDI-MS analysis performed subsequent to a partial alkaline hydrolysis of cross-linked peptide-oligoribonucleotide complexes allowed for the first time the cross-linked rRNA moiety to be sequenced by this technique. In this manner Lys-44 in S4 was determined to be cross-linked to the oligoribonucleotide at positions 1531-1542 on the 16 S RNA (whereby either U-1541 or A-1542 is the actual cross-link site), Lys-75 in S7 to positions 1374-1379 (C-1378 cross-linked), Met-114 in S7 to 1234-1241 (U-1240 cross-linked), Lys-55 in S8 to 651-654 (U-653 cross-linked), and Lys-29 in S17 to 629-633 (U-632 cross-linked). The novel approach applied here promises to be useful for similar studies on other known protein.RNA complexes.

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