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Abstract
A 1.8 kb PstI fragment from Halobacterium halobium DNA was found to hybridize to synthetic oligonu-cleotide probes constructed by using the sequence of the N-terminus of a Mn-containing superoxide dismutase purified from H.halobium. The entire insert containing a 600-bp coding sequence for Mn-SOD and its 5′ and 3′ flanking regions was sequenced. The derived amino acid sequence of the structural gene showed a similarity to other manganic and iron-containing superoxide dismutases in normally conserved regions. Primer extension analysis of the H. halobium Mn-SOD mRNA showed that gene transcription begins 14 bases upstream of the translational start. A Shine-Dalgarno sequence and archaebacterial consensus promoter sequences were observed. Several other promoter and terminator nucleotide sequences homologous to prokaryotic and eukaryotic organisms were found.