7a9r | pdb_00007a9r

Racemic compound of RNA duplexes.

spinqualitylabelsall models 7a9r, resolution 2.46Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 7a9r is a 4 chain structure with sequence from Thermus thermophilus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.455Å Ligands: 0C, 0G, 0U, ZN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Explaining the origin of the homochirality of biological molecules requires a mechanism of disrupting the natural equilibrium between enantiomers and amplifying the initial imbalance to significant levels. Authors of existing models have sought an explanation in the parity-breaking weak nuclear force, in some selectively acting external factor, or in random fluctuations that subsequently became amplified by an autocatalytic process. We have obtained crystals in which l- and d-enantiomers of short RNA duplexes assemble in an asymmetric manner. These enantiomers make different lattice contacts and have different exposures to water and metal ions present in the crystal. Apparently, asymmetry between enantiomers can arise upon their mutual interactions and then propagate via crystallization. Asymmetric racemic compounds are worth considering as possible factors in symmetry breaking and enantioenrichment that took place in the early biosphere. Broken symmetry between RNA enantiomers in a crystal lattice.,Kiliszek A, Blaszczyk L, Bejger M, Rypniewski W Nucleic Acids Res. 2021 Dec 2;49(21):12535-12539. doi: 10.1093/nar/gkab480. PMID:34107036 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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