scholarly journals Structural basis for specific binding of Polycomb chromodomain to histone H3 methylated at Lys 27

2003 ◽  
Vol 17 (15) ◽  
pp. 1823-1828 ◽  
Author(s):  
J. Min
Keyword(s):  
Specific Binding ◽  
Histone H3 ◽  
Structural Basis

scholarly journals Structural Basis for Specific Binding of Human MPP8 Chromodomain to Histone H3 Methylated at Lysine 9

PLoS ONE ◽  
2011 ◽  
Vol 6 (10) ◽  
pp. e25104 ◽  
Author(s):  
Jing Li ◽  
Zhihong Li ◽  
Jianbin Ruan ◽  
Chao Xu ◽  
Yufeng Tong ◽  
...  
Keyword(s):  
Specific Binding ◽  
Histone H3 ◽  
Structural Basis

scholarly journals Crystallization of and selenomethionine phasing strategy for a SETMAR–DNA complex

2016 ◽  
Vol 72 (9) ◽  
pp. 713-719 ◽  
Author(s):  
Qiujia Chen ◽  
Millie Georgiadis
Keyword(s):  
Dna Binding ◽  
Catalytic Domain ◽  
Specific Binding ◽  
Critical Role ◽  
Binding Activity ◽  
Structural Basis ◽  
Unexpected Finding ◽  
Terminal Inverted Repeat ◽  
Dna Binding Activity ◽  
New Genes

Transposable elements have played a critical role in the creation of new genes in all higher eukaryotes, including humans. Although the chimeric fusion protein SETMAR is no longer active as a transposase, it contains both the DNA-binding domain (DBD) and catalytic domain of theHsmar1transposase. The amino-acid sequence of the DBD has been virtually unchanged in 50 million years and, as a consequence, SETMAR retains its sequence-specific binding to the ancestralHsmar1terminal inverted repeat (TIR) sequence. Thus, the DNA-binding activity of SETMAR is likely to have an important biological function. To determine the structural basis for the recognition of TIR DNA by SETMAR, the design of TIR-containing oligonucleotides and SETMAR DBD variants, crystallization of DBD–DNA complexes, phasing strategies and initial phasing experiments are reported here. An unexpected finding was that oligonucleotides containing two BrdUs in place of thymidines produced better quality crystals in complex with SETMAR than their natural counterparts.

scholarly journals Structural Basis of LSD1-CoREST Selectivity in Histone H3 Recognition

2007 ◽  
Vol 282 (28) ◽  
pp. 20070-20074 ◽  
Author(s):  
Federico Forneris ◽  
Claudia Binda ◽  
Antonio Adamo ◽  
Elena Battaglioli ◽  
Andrea Mattevi
Keyword(s):  
Histone H3 ◽  
Structural Basis

scholarly journals Ribosome inhibition by C9ORF72-ALS/FTD-associated poly-PR and poly-GR proteins revealed by cryo-EM

2020 ◽  
Author(s):  
Anna B. Loveland ◽  
Egor Svidritskiy ◽  
Denis Susorov ◽  
Soojin Lee ◽  
Alexander Park ◽  
...  
Keyword(s):  
Amyotrophic Lateral Sclerosis ◽  
Specific Binding ◽  
Structural Basis ◽  
Transferase Activity ◽  
Peptidyl Transferase ◽  
Peptidyl Transferase Center ◽  
Ribosomal Tunnel ◽  
Cellular Translation ◽  
Lateral Sclerosis ◽  
Dipeptide Repeat

AbstractToxic dipeptide repeat (DPR) proteins are produced from expanded G4C2 hexanucleotide repeats in the C9ORF72 gene, which cause amyotrophic lateral sclerosis (ALS) and frontotemporal dementia (FTD). Two DPR proteins, poly-PR and poly-GR, repress cellular translation but the molecular mechanism remains unknown. Here we show that poly-PR and poly-GR of ≥ 20 repeats inhibit the ribosome’s peptidyl-transferase activity at nanomolar concentrations, comparable to specific translation inhibitors. High-resolution cryo-EM structures reveal that poly-PR and poly-GR block the polypeptide tunnel of the ribosome, extending into the peptidyl-transferase center. Consistent with these findings, the macrolide erythromycin, which binds in the tunnel, competes with the DPR proteins and restores peptidyl-transferase activity. Our results demonstrate that strong and specific binding of poly-PR and poly-GR in the ribosomal tunnel blocks translation, revealing the structural basis of their toxicity in C9ORF72-ALS/FTD.

scholarly journals Structural basis of recognition and destabilization of the histone H2B ubiquitinated nucleosome by the DOT1L histone H3 Lys79 methyltransferase

2019 ◽  
Vol 33 (11-12) ◽  
pp. 620-625 ◽  
Author(s):  
Seongmin Jang ◽  
Chanshin Kang ◽  
Han-Sol Yang ◽  
Taeyang Jung ◽  
Hans Hebert ◽  
...  
Keyword(s):  
Histone H3 ◽  
Structural Basis ◽  
Histone H2b

Partial agonism by gastrin for a cholecystokinin receptor mediating pepsinogen secretion

1993 ◽  
Vol 265 (5) ◽  
pp. G865-G872
Author(s):  
L. H. Tang ◽  
M. D. Miller ◽  
J. R. Goldenring ◽  
I. M. Modlin ◽  
S. J. Hersey
Keyword(s):  
Partial Agonist ◽  
Specific Binding ◽  
Receptor Occupancy ◽  
Structural Basis ◽  
Tyrosine Residue ◽  
Gastric Glands ◽  
Cholecystokinin Receptor ◽  
Isolated Gastric Glands ◽  
Pepsinogen Secretion ◽  
Type Receptor

Isolated gastric glands from rabbit were used to characterize the functional cholecystokinin (CCK)-like peptide receptors that mediate pepsinogen secretion. Pepsinogen secretion was stimulated by both CCK octapeptide sulfate (CCK-8) and A-71378, a selective CCK-A-type receptor agonist, with similar mean effective doses (1.0 and 0.8 nM, respectively). Compared with CCK-8, gastrin-17 (G-17-I) showed reduced potency and only partial efficacy for stimulation of pepsinogen secretion while inhibiting the maximal CCK-8-stimulated response. The nonpeptide inhibitors, asperlicin and L-364,718, inhibited pepsinogen secretion with identical pA2 values for antagonism of both CCK and gastrin, indicating that both peptides interact with the same functional receptor. Specific binding of [3H]CCK-8 to isolated chief cell membranes was displaced fully by both CCK and gastrin, indicating full receptor occupancy by both peptides. A novel synthetic peptide analogue, pseudogastrin [(Glu)5-Ala-Tyr-Nle-Gly-Trp-Nle-Asp-Phe-NH2], was used to investigate the structural basis for the lower potency and efficacy of G-17-I. The potency of CCK and gastrin analogues for pepsinogen secretion was found to be dependent on both sulfation of a tyrosine residue and the position of the tyrosine residue relative to the COOH-terminal phenylalanine amide. The efficacy appears to be determined partially by the extended NH2-terminal sequence of G-17-I. The results of the present study are interpreted to show that pepsinogen secretion is mediated by a CCK-A-type receptor and gastrin acts at the same receptor as a partial agonist.

scholarly journals Structural Basis for Specific Binding of the Gads SH3 Domain to an RxxK Motif-Containing SLP-76 Peptide

2003 ◽  
Vol 11 (2) ◽  
pp. 471-481 ◽  
Author(s):  
Qin Liu ◽  
Donna Berry ◽  
Piers Nash ◽  
Tony Pawson ◽  
C.Jane McGlade ◽  
...  
Keyword(s):  
Specific Binding ◽  
Sh3 Domain ◽  
Structural Basis

scholarly journals Determination of the structural basis for selective binding of Epstein-Barr virus to human complement receptor type 2.

1991 ◽  
Vol 174 (6) ◽  
pp. 1299-1311 ◽  
Author(s):  
D R Martin ◽  
A Yuryev ◽  
K R Kalli ◽  
D T Fearon ◽  
J M Ahearn
Keyword(s):  
Epstein Barr Virus ◽  
Specific Binding ◽  
Glycosylation Site ◽  
Single Amino Acid ◽  
Structural Basis ◽  
Viral Receptor ◽  
Barr Virus ◽  
Preferential Binding ◽  
Epstein Barr ◽  
Species Specific

Epstein-Barr virus (EBV) is an oncogenic herpesvirus that selectively infects and immortalizes human B lymphocytes. One determinant of this narrow tropism is human CR2, the only viral receptor within the superfamily of proteins that contain short consensus repeats (SCRs). Human CR2 serves as a receptor for both C3dg and the gp350/220 glycoprotein of EBV, and binds the monoclonal antibody (mAb) OKB7, which blocks binding of both ligands to the receptor. In contrast, although murine CR2 is capable of binding human C3dg and this interaction can be blocked with the mAb 7G6, it does not bind OKB7 or EBV. We have determined the structural basis for absolute specificity of EBV for human CR2 through characterization of a panel of 24 human-murine chimeric receptors, all of which bind human C3dg. The results indicate that preferential binding of EBV to human CR2 is not due to unique amino acids that are capable of binding the virus, but reflects a distinct receptor conformation that can be achieved in murine CR2 with single amino acid substitutions in two discontinuous regions of the primary structure: replacement of proline at position 15 with the corresponding serine from human CR2, and elimination of a potential N-linked glycosylation site between SCR-1 and SCR-2. Furthermore, species-specific binding of EBV, OKB7, and 7G6 can all be manipulated through substitutions among residues 8-15, suggesting that this octapeptide is part of a structural determinant that is critical for binding of both viral and natural ligands to CR2.

scholarly journals Structural basis of nucleosomal histone H4 lysine 20 methylation by SET8 methyltransferase

2021 ◽  
Vol 4 (4) ◽  
pp. e202000919
Author(s):  
Cheng-Han Ho ◽  
Yoshimasa Takizawa ◽  
Wataru Kobayashi ◽  
Yasuhiro Arimura ◽  
Hiroshi Kimura ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Essential Role ◽  
Histone H3 ◽  
Underlying Mechanism ◽  
Structural Basis ◽  
Histone H4 ◽  
Nucleosomal Histone

SET8 is solely responsible for histone H4 lysine-20 (H4K20) monomethylation, which preferentially occurs in nucleosomal H4. However, the underlying mechanism by which SET8 specifically promotes the H4K20 monomethylation in the nucleosome has not been elucidated. Here, we report the cryo-EM structures of the human SET8–nucleosome complexes with histone H3 and the centromeric H3 variant, CENP-A. Surprisingly, we found that the overall cryo-EM structures of the SET8–nucleosome complexes are substantially different from the previous crystal structure models. In the complexes with H3 and CENP-A nucleosomes, SET8 specifically binds the nucleosomal acidic patch via an arginine anchor, composed of the Arg188 and Arg192 residues. Mutational analyses revealed that the interaction between the SET8 arginine anchor and the nucleosomal acidic patch plays an essential role in the H4K20 monomethylation activity. These results provide the groundwork for understanding the mechanism by which SET8 specifically accomplishes the H4K20 monomethylation in the nucleosome.

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