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10 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Na(SmS2)3 by Materials Project

SmNa(SmS2)2(S)2 crystallizes in the orthorhombic Cmmm space group. The structure is two-dimensional and consists of four hydrogen sulfide molecules; two samario molecules; and one Na(SmS2)2 sheet oriented in the (0, 0, 1) direction. In the Na(SmS2)2 sheet, Na1+ is bonded in a distorted rectangular see-saw-like geometry to four equivalent S+1.33- atoms. All Na–S bond lengths are 2.79 Å. Sm+2.33+ is bonded in a linear geometry to two equivalent S+1.33- atoms. Both Sm–S bond lengths are 2.49 Å. S+1.33- is bonded in a distorted linear geometry to one Na1+ and one Sm+2.33+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ce(SmS2)2 by Materials Project

Ce(SmS2)2 crystallizes in the tetragonal I-42d space group. The structure is three-dimensional. Sm+2.50+ is bonded to eight equivalent S2- atoms to form distorted SmS8 hexagonal bipyramids that share corners with four equivalent SmS8 hexagonal bipyramids, corners with four equivalent CeS8 hexagonal bipyramids, edges with four equivalent SmS8 hexagonal bipyramids, faces with four equivalent SmS8 hexagonal bipyramids, and faces with four equivalent CeS8 hexagonal bipyramids. There are a spread of Sm–S bond distances ranging from 2.86–3.06 Å. Ce3+ is bonded to eight equivalent S2- atoms to form distorted CeS8 hexagonal bipyramids that share corners with eight equivalent SmS8 hexagonal bipyramids, edges with four equivalent CeS8 hexagonal bipyramids, and faces with eight equivalent SmS8 hexagonal bipyramids. There are four shorter (2.88 Å) and four longer (3.05 Å) Ce–S bond lengths. S2- is bonded to four equivalent Sm+2.50+ and two equivalent Ce3+ atoms to form a mixture of distorted edge, face, and corner-sharing SCe2Sm4 octahedra. The corner-sharing octahedra tilt angles range from 16–50°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sr(SmS2)2 by Materials Project

Sr(SmS2)2 crystallizes in the tetragonal I-42d space group. The structure is three-dimensional. Sr2+ is bonded to eight equivalent S2- atoms to form distorted SrS8 hexagonal bipyramids that share corners with eight equivalent SmS8 hexagonal bipyramids, edges with four equivalent SrS8 hexagonal bipyramids, and faces with eight equivalent SmS8 hexagonal bipyramids. There are four shorter (2.95 Å) and four longer (3.13 Å) Sr–S bond lengths. Sm3+ is bonded to eight equivalent S2- atoms to form distorted SmS8 hexagonal bipyramids that share corners with four equivalent SrS8 hexagonal bipyramids, corners with four equivalent SmS8 hexagonal bipyramids, edges with four equivalent SmS8 hexagonal bipyramids, faces with four equivalent SrS8 hexagonal bipyramids, and faces with four equivalent SmS8 hexagonal bipyramids. There are a spread of Sm–S bond distances ranging from 2.83–3.10 Å. S2- is bonded in a 6-coordinate geometry to two equivalent Sr2+ and four equivalent Sm3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Yb(SmS2)2 by Materials Project

Yb(SmS2)2 crystallizes in the tetragonal I-42d space group. The structure is three-dimensional. Yb2+ is bonded to eight equivalent S2- atoms to form distorted YbS8 hexagonal bipyramids that share corners with eight equivalent SmS8 hexagonal bipyramids, edges with four equivalent YbS8 hexagonal bipyramids, and faces with eight equivalent SmS8 hexagonal bipyramids. There are four shorter (2.84 Å) and four longer (3.03 Å) Yb–S bond lengths. Sm3+ is bonded to eight equivalent S2- atoms to form distorted SmS8 hexagonal bipyramids that share corners with four equivalent YbS8 hexagonal bipyramids, corners with four equivalent SmS8 hexagonal bipyramids, edges with four equivalent SmS8 hexagonal bipyramids, faces with four equivalent YbS8 hexagonal bipyramids, and faces with four equivalent SmS8 hexagonal bipyramids. There are a spread of Sm–S bond distances ranging from 2.83–3.03 Å. S2- is bonded to two equivalent Yb2+ and four equivalent Sm3+ atoms to form a mixture of distorted edge, face, and corner-sharing SYb2Sm4 octahedra. The corner-sharing octahedra tilt angles range from 17–50°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on SmS2 by Materials Project

SmS2 is Cubic Laves structured and crystallizes in the cubic Fd-3m space group. The structure is three-dimensional. Sm3+ is bonded in a 12-coordinate geometry to twelve equivalent S+1.50- atoms. All Sm–S bond lengths are 3.27 Å. S+1.50- is bonded to six equivalent Sm3+ and six equivalent S+1.50- atoms to form a mixture of corner, edge, and face-sharing SSm6S6 cuboctahedra. All S–S bond lengths are 2.79 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on SmS2 by Materials Project

SmS2 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. Sm3+ is bonded in a 9-coordinate geometry to nine S+1.50- atoms. There are a spread of Sm–S bond distances ranging from 2.82–3.12 Å. There are two inequivalent S+1.50- sites. In the first S+1.50- site, S+1.50- is bonded to five equivalent Sm3+ atoms to form a mixture of distorted edge and corner-sharing SSm5 trigonal bipyramids. In the second S+1.50- site, S+1.50- is bonded in a 5-coordinate geometry to four equivalent Sm3+ and one S+1.50- atom. The S–S bond length is 2.16 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on SmS2 by Materials Project

SmS2 crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. Sm3+ is bonded in a 9-coordinate geometry to nine S+1.50- atoms. There are a spread of Sm–S bond distances ranging from 2.88–2.97 Å. There are two inequivalent S+1.50- sites. In the first S+1.50- site, S+1.50- is bonded in a 8-coordinate geometry to four equivalent Sm3+ and four equivalent S+1.50- atoms. All S–S bond lengths are 2.78 Å. In the second S+1.50- site, S+1.50- is bonded to five equivalent Sm3+ atoms to form a mixture of distorted edge and corner-sharing SSm5 trigonal bipyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ca(SmS2)2 by Materials Project

CaSm2S4 crystallizes in the tetragonal I-42d space group. The structure is three-dimensional. Ca2+ is bonded to eight equivalent S2- atoms to form distorted CaS8 hexagonal bipyramids that share corners with eight equivalent SmS8 hexagonal bipyramids, edges with four equivalent CaS8 hexagonal bipyramids, and faces with eight equivalent SmS8 hexagonal bipyramids. There are four shorter (2.85 Å) and four longer (3.08 Å) Ca–S bond lengths. Sm3+ is bonded to eight equivalent S2- atoms to form distorted SmS8 hexagonal bipyramids that share corners with four equivalent CaS8 hexagonal bipyramids, corners with four equivalent SmS8 hexagonal bipyramids, edges with four equivalent SmS8 hexagonal bipyramids, faces with four equivalent CaS8 hexagonal bipyramids, and faces with four equivalent SmS8 hexagonal bipyramids. There are a spread of Sm–S bond distances ranging from 2.83–3.06 Å. S2- is bonded in a 6-coordinate geometry to two equivalent Ca2+ and four equivalent Sm3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba(SmS2)2 by Materials Project

BaSm2S4 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Ba2+ is bonded in a 8-coordinate geometry to eight S2- atoms. There are a spread of Ba–S bond distances ranging from 3.24–3.46 Å. There are two inequivalent Sm3+ sites. In the first Sm3+ site, Sm3+ is bonded to six S2- atoms to form a mixture of corner and edge-sharing SmS6 octahedra. The corner-sharing octahedra tilt angles range from 49–65°. There are a spread of Sm–S bond distances ranging from 2.77–2.86 Å. In the second Sm3+ site, Sm3+ is bonded to six S2- atoms to form a mixture of corner and edge-sharing SmS6 octahedra. The corner-sharing octahedra tilt angles range from 49–65°. There are a spread of Sm–S bond distances ranging from 2.77–2.85 Å. There are four inequivalent S2- sites. In the first S2- site, S2- is bonded in a 5-coordinate geometry to two equivalent Ba2+ and three Sm3+ atoms. In the second S2- site, S2- is bonded to two equivalent Ba2+ and three equivalent Sm3+ atoms to form a mixture of corner and edge-sharing SBa2Sm3 square pyramids. In the third S2- site, S2- is bonded in a 5-coordinate geometry to two equivalent Ba2+ and three Sm3+ atoms. In the fourth S2- site, S2- is bonded to two equivalent Ba2+ and three equivalent Sm3+ atoms to form a mixture of distorted corner and edge-sharing SBa2Sm3 trigonal bipyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2025

Characterization of Caenorhabditis elegans sphingomyelin synthases through heterologous expression

Sphingomyelin (SM) is a major component of mammalian cell membranes and particularly abundant in the myelin sheath that surrounds nerve fibers. Its production is catalyzed by SM synthases SMS1 and SMS2, which interconvert phosphatidylcholine and ceramide to diacylglycerol and SM in the Golgi and at the plasma membrane, respectively. As the lipids participating in this reaction fulfill both structural and signaling functions, SMS enzymes have considerable potential to influence diverse important cellular processes. The nematode Caenorhabditis elegans is an attractive model for studying both animal development and human disease. The organism contains five SMS homologues but none of these have been characterized in any detail. Here, we carried out the first systematic analysis of SMS family members in C. elegans . Using heterologous expression systems, genetic ablation, metabolic labeling and lipidome analyses, we show that C. elegans harbors at least three distinct SM synthases and one ceramide phosphoethanolamine (CPE) synthase. Moreover, C. elegans SMS family members have partially overlapping but also unique sub-cellular distributions and together occupy all principal compartments of the secretory pathway. Our findings shed light on crucial aspects of sphingolipid metabolism in a valuable animal model and opens avenues for exploring the role of SM and its metabolic intermediates in organismal development.

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CH↗