Role of Steric Hindrance in the Crystal Packing of Z′ = 4 Superstructure of Trimethyltin Hydroxide

2018 ◽  
Vol 18 (3) ◽  
pp. 1394-1400 ◽  
Author(s):  
S. Dey ◽  
A. Schönleber ◽  
S. Mondal ◽  
S. I. Ali ◽  
S. van Smaalen
Keyword(s):  
Steric Hindrance ◽  
Crystal Packing

Structural, magnetic and Mössbauer spectroscopic studies of the [Fe(3-bpp)2](CF3COO)2 complex: role of crystal packing leading to an incomplete Fe(ii) high spin ⇋ low spin transition

CrystEngComm ◽  
2021 ◽  
Vol 23 (15) ◽  
pp. 2854-2861
Author(s):  
Kristian Handoyo Sugiyarto ◽  
Djulia Onggo ◽  
Hiroki Akutsu ◽  
Varimalla Raghavendra Reddy ◽  
Hari Sutrisno ◽  
...  
Keyword(s):  
High Spin ◽  
Crystal Packing ◽  
Spin Transition ◽  
Spectroscopic Studies ◽  
Mononuclear Complex

Mononuclear complex [Fe(3-bpp)2](CF3COO)2 exhibits a thermal (HS + HS) ⇋ (HS + LS) transition at ∼226 K which is not associated with any crystallographic transition.

scholarly journals Molecular basis of the dual role of the Mlh1-Mlh3 endonuclease in MMR and in meiotic crossover formation

2021 ◽  
Vol 118 (23) ◽  
pp. e2022704118
Author(s):  
Jingqi Dai ◽  
Aurore Sanchez ◽  
Céline Adam ◽  
Lepakshi Ranjha ◽  
Giordano Reginato ◽  
...  
Keyword(s):  
Meiotic Recombination ◽  
Molecular Basis ◽  
Crystal Packing ◽  
Critical Role ◽  
Holliday Junctions ◽  
Dual Roles ◽  
Terminal Domain ◽  
C Terminus ◽  
Meiotic Crossover

In budding yeast, the MutL homolog heterodimer Mlh1-Mlh3 (MutLγ) plays a central role in the formation of meiotic crossovers. It is also involved in the repair of a subset of mismatches besides the main mismatch repair (MMR) endonuclease Mlh1-Pms1 (MutLα). The heterodimer interface and endonuclease sites of MutLγ and MutLα are located in their C-terminal domain (CTD). The molecular basis of MutLγ’s dual roles in MMR and meiosis is not known. To better understand the specificity of MutLγ, we characterized the crystal structure of Saccharomyces cerevisiae MutLγ(CTD). Although MutLγ(CTD) presents overall similarities with MutLα(CTD), it harbors some rearrangement of the surface surrounding the active site, which indicates altered substrate preference. The last amino acids of Mlh1 participate in the Mlh3 endonuclease site as previously reported for Pms1. We characterized mlh1 alleles and showed a critical role of this Mlh1 extreme C terminus both in MMR and in meiotic recombination. We showed that the MutLγ(CTD) preferentially binds Holliday junctions, contrary to MutLα(CTD). We characterized Mlh3 positions on the N-terminal domain (NTD) and CTD that could contribute to the positioning of the NTD close to the CTD in the context of the full-length MutLγ. Finally, crystal packing revealed an assembly of MutLγ(CTD) molecules in filament structures. Mutation at the corresponding interfaces reduced crossover formation, suggesting that these superstructures may contribute to the oligomer formation proposed for MutLγ. This study defines clear divergent features between the MutL homologs and identifies, at the molecular level, their specialization toward MMR or meiotic recombination functions.

Role of supramolecular interactions in crystal packing of Strandberg-type cluster-based hybrid solids

2020 ◽  
Vol 132 (1) ◽  
Author(s):  
Jisha Joseph ◽  
Cinu Winson ◽  
Bharti Singh ◽  
Jemini Jose ◽  
Jency Thomas
Keyword(s):  
Crystal Packing ◽  
Supramolecular Interactions ◽  
Hybrid Solids

The role of weak interactions in the crystal packing of two novel 1D Hg(II) coordination polymers and investigation for preparation of their rod and spherical structures

2020 ◽  
Vol 501 ◽  
pp. 119243 ◽  
Author(s):  
Ghodrat Mahmoudi ◽  
Payam Hayati ◽  
Khosro Mohammadi ◽  
Ardavan Masoudiasl ◽  
Joel T. Mague ◽  
...  
Keyword(s):  
Coordination Polymers ◽  
Crystal Packing ◽  
Weak Interactions ◽  
Spherical Structures

scholarly journals The role of steric hindrance in the intramolecular oxidative aromatic coupling of pyrrolo[3,2-b]pyrroles

2016 ◽  
Vol 52 (77) ◽  
pp. 11539-11542 ◽  
Author(s):  
Maciej Krzeszewski ◽  
Paweł Świder ◽  
Łukasz Dobrzycki ◽  
Michał K. Cyrański ◽  
Witold Danikiewicz ◽  
...  
Keyword(s):  
Carbon Atom ◽  
Steric Hindrance ◽  
Sterically Hindered

Sterically hindered tetraaryl-pyrrolo[3,2-b]pyrroles undergo oxidative aromatic coupling, forming a fluorene scaffold linked via a spiro carbon atom with a novel π-conjugated scaffold.

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