1hnr
H-NS (DNA-BINDING DOMAIN)
Structural highlights
FunctionHNS_ECOLI A DNA-binding protein implicated in transcriptional repression (silencing) as well as in bacterial chromosome organization. H-NS binds tightly to AT-rich dsDNA, increases its thermal stability and inhibits transcription. Also binds to ssDNA and RNA but with a much lower affinity. H-NS has possible histone-like function. May be a global transcriptional regulator through its ability to bind to curved DNA sequences, which are found in regions upstream of a certain subset of promoters. Plays a role in the thermal control of pili and adhesive curli fimbriae production, by inducing transcription of csgD. Represses the CRISPR-cas promoters, permits only weak transcription of the crRNA precursor; its role is antagonized by LeuO. Subject to transcriptional auto-repression. Binds preferentially to the upstream region of its own gene recognizing two segments of DNA on both sides of a bend centered around -150.[1] [2] [3] [4] Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedThe three-dimensional structure of the C-terminal domain (47 residues) obtained from the hydrolysis of H-NS protein with bovine trypsin was determined by NMR measurements and distance geometry calculations. It is composed of an antiparallel beta-sheet, an alpha-helix and a 3(10)-helix which form a hydrophobic core, stabilizing the whole structure. This domain has been found to bind to DNA. Possible DNA binding sites are discussed on the basis of the solution structure of the C-terminal domain of H-NS. Solution structure of the DNA binding domain of a nucleoid-associated protein, H-NS, from Escherichia coli.,Shindo H, Iwaki T, Ieda R, Kurumizaka H, Ueguchi C, Mizuno T, Morikawa S, Nakamura H, Kuboniwa H FEBS Lett. 1995 Feb 27;360(2):125-31. PMID:7875316[5] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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