2jk3 | pdb_00002jk3

CRYSTAL STRUCTURE OF THE HLYIIR MUTANT PROTEIN WITH RESIDUES 169-186 SUBSTITUTED BY GSSGSSG LINKER

spinqualitylabelsall models 2jk3, resolution 2.20Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2jk3 is a 2 chain structure with sequence from Atcc 14579. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: SO4 Related: 2jj7, 2fx0 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT 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 PubMed B. cereus HlyIIR belongs to the TetR family of dimeric transcriptional regulators. Unlike other members of the TetR family, HlyIIR contains an insert between alpha-helices alpha8 and alpha9, which is located at the subunit-subunit interface. N-terminal segment of this insert (amino acids, Pro161-Ser169) forms a short alpha-helix alpha8* that occupies a complementary cavity on the surface of the adjacent subunit, whereas the C-terminal segment comprising 16 amino acids (Leu170-Glu185) is disordered. To understand whether this disordered segment is important for protein's function, we determined crystal structures of two engineered HlyIIR proteins where this segment was either substituted by a seven-residue flexible Ser-Gly linker or replaced by a cleavable peptide containing proteolytic sites at both ends. Unexpectedly, alteration or proteolytic removal of the disordered segment resulted in changes in protein's conformation and in a remarkable rearrangement at the subunit-subunit interface. X-ray structures of the two engineered proteins revealed an unusual plasticity at the dimerization interface of HlyIIR enabling it to form dimers stabilized by different sets of interactions. Structural comparison indicates that in spite of the flexible nature of the disordered segment, it is critical for maintaining the native structure as it influences the position of alpha8*. The data demonstrate how disordered loops on protein surfaces may affect folding and subunit-subunit interactions. Proteins 2010. (c) 2010 Wiley-Liss, Inc. Structural investigation of transcriptional regulator HlyIIR: Influence of a disordered region on protein fold and dimerization.,Kovalevskiy OV, Solonin AS, Antson AA Proteins. 2010 Feb 3. PMID:20225260 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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