Abstract
The archaeon Sulfolobus solfataricus expresses large amounts of a small basic protein, Sso7d, which was previously identified as a DNA-binding protein possibly involved in compaction of DNA. We have determined the solution structure of Sso7d. The protein consists of a triple-stranded anti-parallel β-sheet onto which an orthogonal double-stranded β-sheet is packed. This topology is very similar to that found in eukaryotic Src homology-3 (SH3) domains. Sso7d binds strongly (Kd < 10 μM) to double-stranded DNA and protects it from thermal denaturation. In addition, we note that ɛ-mono-methylation of lysine side chains of Sso7d is governed by cell growth temperatures, suggesting that methylation is related to the heat-shock response.
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Baumann, H., Knapp, S., Lundbäck, T. et al. Solution structure and DNA-binding properties of a thermostable protein from the archaeon Sulfolobus solfataricus. Nat Struct Mol Biol 1, 808–819 (1994). https://doi.org/10.1038/nsb1194-808
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DOI: https://doi.org/10.1038/nsb1194-808
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