Cartography of ribosomal proteins of the 30S subunit from the halophilic Haloarcula marismortui and complete sequence analysis of protein HS26.

By two-dimensional polyacrylamide gel electrophoresis of 30S ribosomal subunit proteins (S proteins) from Haloarcula marismortui we identified 27 distinct spots and analyzed all of them by protein sequence analysis. We demonstrated that protein HmaS2 (HS2) is encoded by the open reading frame orfMSG and has sequence similarities to the S2 ribosomal protein family. The proteins HmaS5 and HmaS14 were identified as spots HS7 and HS21/HS22, respectively.

Amino acid sequence of the ribosomal protein HS23 from the halophilic Haloarcula marismortui and homology studies to other ribosomal proteins.

The ribosomal protein HS23 from the 30S subunit of the extreme halophilic Haloarcula marismortui, belonging to the group of archaea, was isolated either by RP-HLPLC or two-dimensional polyacrylamide gel electrophoresis. The complete amino acid sequence was determined by automated N-terminal microsequencing. The protein consists of 123 residues with a corresponding molecular mass of 12,552 Da as determined by electrospray mass spectroscopy; the pI is 11.

Complete amino acid sequence of ribosomal protein S14 from Bacillus stearothermophilus and homology studies to other ribosomal proteins.

The complete amino acid sequence of protein S14 from the small subunit of Bacillus stearothermophilus was determined by N-terminal sequence analysis and by sequencing of overlapping peptides obtained from enzymatic digestions. Protein S14 consists of 60 amino acid residues with a molecular mass of 7148 Da. It has a high content of basic amino acids and a predicted isoelectric point of 11.