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Nucleotide sequence of a gene encoding a histone-like protein in the archaeon Methanococcus voltae.

We have detected in Methanococcus voltae a gene which encodes a histone-like protein. Because of the similarity of the polypeptide sequence to that of the previously described hmJB gene product of Methanothennus fervidus (1) we call the gene hmvA. The protein has significant homology to eukaryotic histones A2 and A3. The degree of similarity between the two archaeal gene products is shown in Figure 1. They differ in the length of their C-termini, which might indicate that the HMV-protein interacts with factor types not recognized by the HMf protein. No sequence similarities of the hmvA-product were detected with the MC1 protein of Methanosarcina barkeri (2) nor with the basic Escherichia coli proteins HU1 (3), HU2 (4) or H-NS (5).