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Two genes, designated hpyA1 and hpyA2, have been cloned and sequenced from Pyrococcus strain GB-3a. They are predicted to encode proteins (HPyA1 and HPyA2, respectively) that are approx. 60% identical to the histones HMf and HMt, characterized from methanogenic Archaea. These archaeal histones also contain the amino-acid sequences, conserved in eukaryotic H4 histones, that are thought to interact directly with DNA.

Citation

K Sandman, F B Perler, J N Reeve. Histone-encoding genes from Pyrococcus: evidence for members of the HMf family of archaeal histones in a non-methanogenic Archaeon. Gene. 1994 Dec 2;150(1):207-8

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PMID: 7959058

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