1HSJ

SARR MBP FUSION STRUCTURE

1HSJ の概要

• エントリーDOI: 10.2210/pdb1hsj/pdb
• 分子名称: FUSION PROTEIN CONSISTING OF STAPHYLOCOCCUS ACCESSORY REGULATOR PROTEIN R AND MALTOSE BINDING PROTEIN, alpha-D-glucopyranose (2 entities in total)
• 機能のキーワード: novel fold for dna binding, transcription-sugar binding protein complex, transcription/sugar binding protein
• 由来する生物種: Escherichia coli; 詳細
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 109576.24

構造登録者

Zhang, G. (登録日: 2000-12-26, 公開日: 2001-06-06, 最終更新日: 2023-08-09)

主引用文献

Liu, Y.,Manna, A.,Li, R.,Martin, W.E.,Murphy, R.C.,Cheung, A.L.,Zhang, G.
Crystal structure of the SarR protein from Staphylococcus aureus.
Proc.Natl.Acad.Sci.USA, 98:6877-6882, 2001

PubMed Abstract: The expression of virulence determinants in Staphylococcus aureus is controlled by global regulatory loci (e.g., sarA and agr). The sar (Staphylococcus accessory regulator) locus is composed of three overlapping transcripts (sarA P1, P3, and P2, transcripts initiated from the P1, P3, and P2 promoters, respectively), all encoding the 124-aa SarA protein. The level of SarA, the major regulatory protein, is partially controlled by the differential activation of the sarA promoters. We previously partially purified a 13.6-kDa protein, designated SarR, that binds to the sarA promoter region to down-modulate sarA transcription from the P1 promoter and subsequently SarA expression. SarR shares sequence similarity to SarA, and another SarA homolog, SarS. Here we report the 2.3 A-resolution x-ray crystal structure of the dimeric SarR-MBP (maltose binding protein) fusion protein. The structure reveals that the SarR protein not only has a classic helix-turn-helix module for DNA binding at the major grooves, but also has an additional loop region involved in DNA recognition at the minor grooves. This interaction mode could represent a new functional class of the "winged helix" family. The dimeric SarR structure could accommodate an unusually long stretch of approximately 27 nucleotides with two or four bending points along the course, which could lead to the bending of DNA by 90 degrees or more, similar to that seen in the catabolite activator protein (CAP)-DNA complex. The structure also demonstrates the molecular basis for the stable dimerization of the SarR monomers and possible motifs for interaction with other proteins.

PubMed: 11381122
DOI: 10.1073/pnas.121013398

実験手法

X-RAY DIFFRACTION (2.3 Å)