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8 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on IF3 by Materials Project

IF3 is High Pressure (4-7GPa) Tellurium structured and crystallizes in the orthorhombic Pnma space group. The structure is zero-dimensional and consists of four IF3 clusters. I is bonded in a T-shaped geometry to three F atoms. There is one shorter (1.91 Å) and two longer (2.02 Å) I–F bond length. There are two inequivalent F sites. In the first F site, F is bonded in a single-bond geometry to one I atom. In the second F site, F is bonded in a single-bond geometry to one I atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on AsS(IF3)2 by Materials Project

AsS(IF3)2 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. there are two inequivalent As2- sites. In the first As2- site, As2- is bonded in an octahedral geometry to six F1- atoms. There is two shorter (1.77 Å) and four longer (1.78 Å) As–F bond length. In the second As2- site, As2- is bonded in an octahedral geometry to six F1- atoms. There is four shorter (1.77 Å) and two longer (1.79 Å) As–F bond length. S2- is bonded in a 5-coordinate geometry to one S2-, two I5+, and three F1- atoms. The S–S bond length is 1.86 Å. There are one shorter (2.86 Å) and one longer (3.24 Å) S–I bond lengths. There are a spread of S–F bond distances ranging from 2.98–3.32 Å. There are two inequivalent I5+ sites. In the first I5+ site, I5+ is bonded in a distorted single-bond geometry to one S2-, one I5+, and one F1- atom. The I–I bond length is 2.63 Å. The I–F bond length is 2.89 Å. In the second I5+ site, I5+ is bonded in an L-shaped geometry to one S2- and one I5+ atom. There are six inequivalent F1- sites. In the first F1- site, F1- is bonded in a single-bond geometry to one As2- atom. In the second F1- site, F1- is bonded in a single-bond geometry to one As2- atom. In the third F1- site, F1- is bonded in a single-bond geometry to one As2- and one S2- atom. In the fourth F1- site, F1- is bonded in a single-bond geometry to one As2- and one S2- atom. In the fifth F1- site, F1- is bonded in a single-bond geometry to one As2- and one I5+ atom. In the sixth F1- site, F1- is bonded in a single-bond geometry to one As2- and one S2- atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CsPPb(IF3)2 by Materials Project

CsPbP(IF3)2 crystallizes in the tetragonal P4/mmm space group. The structure is three-dimensional. Cs1+ is bonded to eight F1- atoms to form CsF8 hexagonal bipyramids that share edges with four equivalent CsF8 hexagonal bipyramids and edges with four equivalent PF6 octahedra. All Cs–F bond lengths are 3.49 Å. Pb2+ is bonded to four equivalent I1- and two equivalent F1- atoms to form distorted PbI4F2 octahedra that share corners with two equivalent PF6 octahedra and corners with four equivalent PbI4F2 octahedra. The corner-sharing octahedral tilt angles are 0°. All Pb–I bond lengths are 3.15 Å. Both Pb–F bond lengths are 2.65 Å. P5+ is bonded to six F1- atoms to form PF6 octahedra that share corners with two equivalent PbI4F2 octahedra and edges with four equivalent CsF8 hexagonal bipyramids. The corner-sharing octahedral tilt angles are 0°. There is four shorter (1.64 Å) and two longer (1.65 Å) P–F bond length. I1- is bonded in a linear geometry to two equivalent Pb2+ atoms. There are three inequivalent F1- sites. In the first F1- site, F1- is bonded in a distorted single-bond geometry to one Pb2+ and one P5+ atom. In the second F1- site, F1- is bonded in a single-bond geometry to two equivalent Cs1+ and one P5+ atom. In the third F1- site, F1- is bonded in a single-bond geometry to two equivalent Cs1+ and one P5+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on As(IF3)2 by Materials Project

F(AsF3)(IF1)2 is Cubane-derived structured and crystallizes in the monoclinic C2/m space group. The structure is zero-dimensional and consists of eight iodine monofluoride molecules and four F(AsF3) clusters. In each F(AsF3) cluster, As2+ is bonded in a trigonal pyramidal geometry to four F1- atoms. There are a spread of As–F bond distances ranging from 1.73–1.78 Å. There are three inequivalent F1- sites. In the first F1- site, F1- is bonded in a single-bond geometry to one As2+ atom. In the second F1- site, F1- is bonded in a single-bond geometry to one As2+ atom. In the third F1- site, F1- is bonded in a single-bond geometry to one As2+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on As(IF3)2 by Materials Project

AsF6(I)2 crystallizes in the monoclinic C2/m space group. The structure is zero-dimensional and consists of eight hydriodic acid molecules and four AsF6 clusters. In each AsF6 cluster, As2+ is bonded in an octahedral geometry to six F1- atoms. There are a spread of As–F bond distances ranging from 1.73–1.80 Å. There are four inequivalent F1- sites. In the first F1- site, F1- is bonded in a single-bond geometry to one As2+ atom. In the second F1- site, F1- is bonded in a single-bond geometry to one As2+ atom. In the third F1- site, F1- is bonded in a single-bond geometry to one As2+ atom. In the fourth F1- site, F1- is bonded in a single-bond geometry to one As2+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2022

CRISPR-RNAa: targeted activation of translation using dCas13 fusions to translation initiation factors

Abstract Tools for synthetically controlling gene expression are a cornerstone of genetic engineering. CRISPRi and CRISPRa technologies have been applied extensively for programmable modulation of gene transcription, but there are few such tools for targeted modulation of protein translation rates. Here, we employ CRISPR-Cas13 as a programmable activator of translation. We develop a novel variant of the catalytically-deactivated Cas13d enzyme dCasRx by fusing it to translation initiation factor IF3. We demonstrate dCasRx-IF3’s ability to enhance expression 21.3-fold above dCasRx when both are targeted to the start of the 5′ untranslated region of mRNA encoding red fluorescent protein in Escherichia coli. Activation of translation is location-dependent, and we show dCasRx-IF3 represses translation when targeted to the ribosomal binding site, rather than enhancing it. We provide evidence that dCasRx-IF3 targeting enhances mRNA stability relative to dCasRx, providing mechanistic insights into how this new tool functions to enhance gene expression. We also demonstrate targeted upregulation of native LacZ 2.6-fold, showing dCasRx-IF3’s ability to enhance expression of endogenous genes. dCasRx-IF3 requires no additional host modification to influence gene expression. This work outlines a novel approach, CRISPR-RNAa, for post-transcriptional control of translation to activate gene expression.

59 BASIC BIOLOGICAL SCIENCES↗
DOE OSTI2020

Materials Data on As(IF2)3 by Materials Project

As(IF3)2I crystallizes in the triclinic P-1 space group. The structure is zero-dimensional and consists of two hydriodic acid molecules and two As(IF3)2 clusters. In each As(IF3)2 cluster, As3+ is bonded in an octahedral geometry to six F1- atoms. There are a spread of As–F bond distances ranging from 1.76–1.81 Å. There are two inequivalent I1+ sites. In the first I1+ site, I1+ is bonded in a single-bond geometry to one F1- atom. The I–F bond length is 2.66 Å. In the second I1+ site, I1+ is bonded in a single-bond geometry to one F1- atom. The I–F bond length is 2.80 Å. There are six inequivalent F1- sites. In the first F1- site, F1- is bonded in a single-bond geometry to one As3+ atom. In the second F1- site, F1- is bonded in a single-bond geometry to one As3+ atom. In the third F1- site, F1- is bonded in a single-bond geometry to one As3+ atom. In the fourth F1- site, F1- is bonded in a single-bond geometry to one As3+ and one I1+ atom. In the fifth F1- site, F1- is bonded in a distorted single-bond geometry to one As3+ and one I1+ atom. In the sixth F1- site, F1- is bonded in a single-bond geometry to one As3+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on SbI5F6 by Materials Project

SbF6(Sb(IF3)2)2(I)11 crystallizes in the triclinic P-1 space group. The structure is zero-dimensional and consists of eleven hydriodic acid molecules, two Sb(IF3)2 clusters, and one SbF6 cluster. In each Sb(IF3)2 cluster, Sb5+ is bonded in an octahedral geometry to six F1- atoms. There are a spread of Sb–F bond distances ranging from 1.91–1.95 Å. There are two inequivalent I+0.20+ sites. In the first I+0.20+ site, I+0.20+ is bonded in a single-bond geometry to one F1- atom. The I–F bond length is 2.80 Å. In the second I+0.20+ site, I+0.20+ is bonded in a single-bond geometry to one F1- atom. The I–F bond length is 2.81 Å. There are six inequivalent F1- sites. In the first F1- site, F1- is bonded in a single-bond geometry to one Sb5+ atom. In the second F1- site, F1- is bonded in a single-bond geometry to one Sb5+ atom. In the third F1- site, F1- is bonded in a single-bond geometry to one Sb5+ and one I+0.20+ atom. In the fourth F1- site, F1- is bonded in a single-bond geometry to one Sb5+ and one I+0.20+ atom. In the fifth F1- site, F1- is bonded in a single-bond geometry to one Sb5+ atom. In the sixth F1- site, F1- is bonded in a single-bond geometry to one Sb5+ atom. In the SbF6 cluster, Sb5+ is bonded in an octahedral geometry to six F1- atoms. There are a spread of Sb–F bond distances ranging from 1.91–1.94 Å. There are three inequivalent F1- sites. In the first F1- site, F1- is bonded in a single-bond geometry to one Sb5+ atom. In the second F1- site, F1- is bonded in a single-bond geometry to one Sb5+ atom. In the third F1- site, F1- is bonded in a single-bond geometry to one Sb5+ atom.

36 MATERIALS SCIENCE↗