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The ribosomal protein HmaS7 from the 30S subunit of the extreme halophilic archaeum Haloarcula marismortui was isolated by semi-preparative RP-HPLC. The complete amino-acid sequence of this protein was determined by automated microsequence analysis of appropriate peptide fragments from several proteinase digests. The entire protein consists of 205 amino acids with a corresponding molecular mass of 22580 Da. The modification at the amino-terminal amino acid was deblocked so that the N-terminal amino acids could be sequenced and the type of the modification was identified as an acetyl group by electrospray mass spectrometry of suitable peptides. Homology studies of HmaS7 showed similarities to ribosomal proteins derived from organisms of all three urkingdoms, such as to EcoS7, HmoS7, MvaS7, SacS7 and RatS7; due to the strong sequence homologies found within the archaebacterial ribosomal proteins we conclude that the protein sequence which was determined for S7 from Methanococcus vannielii by nucleotide sequencing of the gene should be about 20 or 30 amino acids longer than previously published (Lechner, K., Heller, G. &amp; Böck, A. (1989) J. Mol. Evol. 29, 20-27).

biological chemistry hoppe-seyler

N-Terminal Modifikation and Amino-Acid Sequence of the Ribosomal Protein HmaS7 from  Haloarcula marismortui  and Homology Studies to other Ribosomal Proteins