Nucleotide sequence of the genes encoding the L3, L4, and L23 equivalent ribosomal proteins from the archaebacterium Halobacterium halobium.

A lambda EMBL clone containing a gene cluster coding for the ribosomal proteins L3, L4, L23 and 5' region of L2 was identified in a genomic library for the halophilic archaebacterium Halobacterium halobium using a heterologous hybridization probe from the related organism Halobacterium marismortui. The clone also contains two conserved open reading frames found in H. marismortui, although with still unknown function. Its gene organization is very similar to that of 'S10 operon' of H. marismortui. The deduced amino acid sequence of these ribosomal proteins (HhaL3, HhaL4, HhaL23 and 5' region of HhaL2) shows high similarity (64-71%) to those of the archaebacterium H. marismortui and a lesser degree of similarity to their eukaryotic (31-42%) and eubacterial (17-33%) counterparts.

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