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  • Title: Structural Insight of the Full-Length Ros Protein: A Prototype of the Prokaryotic Zinc-Finger Family.
    Author: D'Abrosca G, Paladino A, Baglivo I, Russo L, Sassano M, Grazioso R, Iacovino R, Pirone L, Pedone EM, Pedone PV, Isernia C, Fattorusso R, Malgieri G.
    Journal: Sci Rep; 2020 Jun 09; 10(1):9283. PubMed ID: 32518326.
    Abstract:
    Ros/MucR is a widespread family of bacterial zinc-finger (ZF) containing proteins that integrate multiple functions such as virulence, symbiosis and/or cell cycle transcription. NMR solution structure of Ros DNA-binding domain (region 56-142, i.e. Ros87) has been solved by our group and shows that the prokaryotic ZF domain shows interesting structural and functional features that differentiate it from its eukaryotic counterpart as it folds in a significantly larger zinc-binding globular domain. We have recently proposed a novel functional model for this family of proteins suggesting that they may act as H-NS-'like' gene silencers. Indeed, the N-terminal region of this family of proteins appears to be responsible for the formation of functional oligomers. No structural characterization of the Ros N-terminal domain (region 1-55) is available to date, mainly because of serious solubility problems of the full-length protein. Here we report the first structural characterization of the N-terminal domain of the prokaryotic ZF family examining by means of MD and NMR the structural preferences of the full-length Ros protein from Agrobacterium tumefaciens.
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