The genes for ribosomal protein L15 and the protein equivalent to secY in the archaebacterium Haloarcula (Halobacterium) marismortui.

The nucleotide sequences of the L15 gene and the secY gene, which form the last two genes of the S10/spc-operon region of Haloarcula marismortui, have been determined. The HmaL15 protein sequence translated from the DNA is 164 amino acids long, revealing 10 amino acids more at the C-terminus than the published protein sequence. The deduced HmasecY protein sequence has 487 amino acids and shows significant homology to its counterparts in Methanococcus vannielii and Escherichia coli. The gene order of the halobacterial gene cluster is similar to that in the methanogens and in eubacteria.