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Query: UNIPROT:P43026 (
lipopolysaccharide
)
62,215
document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)
Isolated cell envelopes of Pseudomonas aeruginosa were treated with N,N'-
dimethylformamide
(
DMF
) or with ethylenediaminetetraacetate (EDTA).
DMF
solubilized 73% of the dry weight of the cell envelope, 76% of the protein, 78% of the carbohydrate, and 76% of the phosphorus. Electron microscopy showed that
DMF
caused extensive alterations in the appearance of the cell envelope with blebs and bleblike vesicles predominating. After incubation with EDTA, the cell envelopes appeared to have lost material, but still retained the cell-like morphology. Analysis of
DMF
-solubilized proteins by sodium dodecyl sulfate-polyacrylamide gel electrophoresis revealed 16 protein bands. There were three major proteins that predominated, however, with molecular masses of 43,000 (protein A), 16,500 (protein B), and 72,000 daltons (protein C). Evidence is presented that protein A and protein B are glycoproteins. Gel electrophoresis of EDTA-solubilized material revealed that a number of proteins were released from the cell envelope. However, electrophoresis of an isolated protein-
lipopolysaccharide
complex released by EDTA showed that protein A and protein B were the major protein components of this complex. These data suggest that protein A and protein B are components of the outer cell wall membrane of P. aeruginosa. There is suggestive evidence that these proteins may play a role in maintaining the structural integrity of the cell envelope. Whether these proteins also have enzymatic activity could not be discerned from the present study, although it is possible that they may be associated with the terminal stages of
lipopolysaccharide
synthesis.
...
PMID:Proteins released from cell envelopes of Pseudomonas aeruginosa on exposure to ethylenediaminetetraacetate: comparison with dimethylformamide-extractable proteins. 463 46
The synthesis of an NbO-type metal-organic framework was achieved by design: o-Br-
BDC
(
BDC
= benzenedicarboxylate) was used to direct the formation of Cu2(CO2)4 paddle wheel units at 90 degrees to each other and thus yield the target network. The compound was formulated as Cu2[o-Br-
BDC
]2(H2O)2.(
DMF
)8(H2O)2 (MOF-101) and characterized by single-crystal X-ray diffraction [cubic, space group Imm (No. 229) with a = 21.607(3) A, V = 10088(2) A3, Z = 6], which fully confirmed the presence of the expected structure. Despite having very large apertures and voids, MOF-101 has a noninterpenetrated structure, an intriguing observation that is discussed in the context of dual structures.
...
PMID:Cu(2)[o-Br-C(6)H(3)(CO(2))(2)](2)(H(2)O)(2).(DMF)(8)(H(2)O)(2): a framework deliberately designed to have the NbO structure type. 1179 98
The solvothermal reaction of zinc acetate dihydrate with a mixture of benzene-1,4-dicarboxylic acid (H(2)
BDC
) and benzene-1,3,5-tricarboxylic acid (H(3)BTC) in a solution containing N,N'-
dimethylformamide
(
DMF
), absolute ethanol, and chlorobenzene gave rise to a metal-organic polymer, Zn(3).
BDC
.2BTC.2NH(CH(3))(2).2NH(2)(CH(3))(2). The structure of this polymer possesses a unique three-dimensional framework with tri-zinc clusters, and
BDC
and BTC units colinking the clusters. Moreover, this metal-organic polymer exhibits strong photoluminescence at room temperature, and the main emission band is at about 430 nm (lambda(ex) = 325 nm). Crystal data for this compound (C(17)H(20)N(2)O(8)Zn(1.5)): monoclinic, space group P2(1)/n, cell dimensions a = 11.6171(3) A, b = 14.2456(4) A, c = 12.6426(3) A, beta = 107.030(2) degrees, V = 2000.51(9) A(3), and Z = 4.
...
PMID:Photoluminescent metal-organic polymer constructed from trimetallic clusters and mixed carboxylates. 1258 23
beta-D-Galactofuranosyl-(1-->3)-D-galactopyranose (1), the repeating unit of the backbone structure of the O-antigenic polysaccharide present in the
lipopolysaccharide
(
LPS
) of the genus Klebsiella, has been efficiently synthesized using 1,2:5,6-di-O-isopropylidine-alpha-D-galactofuranose (3) as the glycosyl acceptor and 2,3,5,6-tetra-O-benzoyl-beta-D-galactofuranosyl trichloroacetimidate (6) as the glycosyl donor with TMSOTf as catalyst by the well-known Schmidt glycosylation method. The preparation of 3 was improved by increasing the ratio of
DMF
to acetone and employing a solid-supported catalyst.
...
PMID:First synthesis of beta-D-Galf-(1-->3)-D-Galp--the repeating unit of the backbone structure of the O-antigenic polysaccharide present in the lipopolysaccharide (LPS) of the genus Klebsiella. 1270 68
Cationic and mixed-valent forms of Fe3O(CO2)6 trigonal prismatic clusters have been linked by ditopic links, namely, 1,4-benzenedicarboxylate (1,4-
BDC
) and 1,3-benzenedicarboxylate (1,3-
BDC
), to produce two 3-periodic metal-organic frameworks (MOFs), [Fe3O(1,4-
BDC
)3 (
DMF
)3][FeCl4] x (
DMF
)3 (MOF-235) and Fe3O(1,3-
BDC
)3 (py)3 x (py)0.5(H2O)1.5 (MOF-236) (
DMF
=
N,N-dimethylformamide
, py = pyridine), respectively. These MOFs exemplify a new, high-symmetry topology termed acs which we identify here as the default arrangement for linking trigonal prisms together.
...
PMID:Metal-organic frameworks based on trigonal prismatic building blocks and the new "acs" topology. 1584
A series of microporous lanthanide metal-organic frameworks, Tb3(
BDC
)(4.5)(
DMF
)2(H2O)3.(
DMF
)(H2O) (1) and Ln3(
BDC
)(4.5)(
DMF
)2(H2O)3.(
DMF
)(C2H5OH)(0.5)(H2O)(0.5) [Ln = Dy (2), Ho (3), Er (4)], have been synthesized by the reaction of the lanthanide metal ion (Ln3+) with 1,4-benzenedicarboxylic acid and triethylenetetramine in a mixed solution of N,N'-
dimethylformamide
(
DMF
), water, and C(2)H(5)OH. X-ray diffraction analyses reveal that they are extremely similar in structure and crystallized in triclinic space group P. An edge-sharing metallic dimer and 4 metallic monomers assemble with 18 carboxylate groups to form discrete inorganic rod-shaped building units [Ln6(CO2)18], which link to each other through phenyl groups to lead to three-dimensional open frameworks with approximately 4 x 6 A rhombic channels along the [0,-1,1] direction. A water sorption isotherm proves that guest molecules in the framework of complex 1 can be removed to create permanent microporosity and about four water molecules per formula unit can be adsorbed into the micropores. These complexes exhibit blue fluorescence, and complex 1 shows a Tb3+ characteristic emission in the range of 450-650 nm.
...
PMID:Synthesis, structure, and luminescent properties of microporous lanthanide metal-organic frameworks with inorganic rod-shaped building units. 1652 79
The solvothermal synthesis of four two-dimensional metal-organic frameworks containing linear dicarboxylic acids as ligands for Zn(II) centres is described. Zn(
BDC
)(
DMF
) [(1) where
BDC
= benzene-1,4-dicarboxylic acid;
DMF
=
N,N-dimethylformamide
] adopts a common paddlewheel motif leading to a 4(4) grid network, whereas Zn(3)(
BDC
)(3)(EtOH)(2) (2), Zn(3)(
BDC
)(3)(H(2)O)(2) * 4DMF (3) and Zn(3)(BPDC)(3)(
DMF
)(2) * 4DMF (4) each form networks with the relatively uncommon 3(6) topology based upon Zn(3)(O(2)CR)(6) secondary building units. All contain coordinated solvent molecules, namely
DMF
[(1) and (4)], ethanol (2) or H(2)O (3). Comparison of structures (2) and (3) illustrates a clay-like flexibility in interplanar spacing which sheds light on the ability of the Zn(3)(
BDC
)(3) framework to undergo desolvation and uptake of small solvent and gas molecules.
...
PMID:Two-dimensional metal-organic frameworks containing linear dicarboxylates. 1698 62
Herein, we present a new method for preparing homoligand 3D coordination polymers. First, a layered metal-organic framework Zn3(
BDC
)3(H2O)2 x 4DMF 1 (
BDC
is terephthalate,
DMF
is
N,N-dimethylformamide
) was fabricated from a H2BDC by liquid-liquid diffusion. Second, the layered product, 1, was used as a precursor to solvothermally react with further H2BDC at 140-180 degrees C, resulting in two products of
BDC
insertion into the layered structure. These are [Zn3(p-BDC)4] x 2HPIP, 2 (HPIP is partly protonated piperazine), and [Zn3(p-BDC)3(H2BDC)] x (C6H15NO) x H2O x 3DMF, 3 (C6H15NO is triethylamine N-oxide). Single-crystal X-ray diffraction shows that 2 possesses a layer-pillared structure of mu4-
BDC
, with 1D channels, while 3 has a layer-pillared structure of mu2-
BDC
, with 2D channels. N2-sorption experiments show 3 has a relatively high BET surface area of 750 m(2)/g. It is proposed that 2 follows the crystal growth mechanism of Ostwald ripening, whereas the crystal structure of 3 might be formed by an insertion mechanism.
...
PMID:Construction of 3D layer-pillared homoligand coordination polymers from a 2D layered precursor. 1702 79
Two erbium-organic frameworks Er2(
BDC
)3(
DMF
)2(H2O)2.H2O (1) and Er2(
BDC
-F4)3(
DMF
)(H2O).
DMF
(2) (
BDC
= 1,4-benzenedicarboxylate;
BDC
-F(4) = 2,3,5,6-tetrafluoro-1,4-benzenedicarboxylate or tetrafluoroterephthalate;
DMF
=
dimethylformamide
) have been synthesized and structurally characterized. Studies on thermal gravimetric analysis and the spectroscopic and luminescent properties of 1, 2, and their desolvated solid Er2(
BDC
)3 (1a) and partially desolvated solid Er2(
BDC
-F4)3(
DMF
).
DMF
(2a) indicate that fluorination can significantly improve the luminescence intensity of the Er ions by reducing the fluorescence quenching effect of the vibrational C-H bond; thus, the near-IR-luminescence intensity of 2a is 3 times higher than that of 1a.
...
PMID:Enhanced near-infrared-luminescence in an erbium tetrafluoroterephthalate framework. 1705 46
Reaction of 1,4-benzenedicarboxylic acid (1,4-H2BDC) with EuCl(3).6H2O in MeOH in the presence of Et3N and MeCN gives a mixture of the 3-D metal-organic-framework (MOF) materials [Eu2(1,4-
BDC
)3(MeOH)4].8MeOH (1) and 2-D [Eu(1,4-
BDC
)(MeOH)4].Cl.MeOH.0.25H2O (2). Similar reactions afforded the isomorphous Gd (3) and Tb (4) analogs of 2. Reaction of 1,4-H2BDC with Ln(NO3)(3).6H2O under similar conditions gave [Ln(
BDC
)NO3(MeOH)2].MeCN.H2O (Ln = Eu (5) and Gd (6)), which have 2-D framework structures. The structures of 1-6 were determined by single crystal X-ray crystallographic studies and the luminescence properties of 1 and 4 in
DMF
solution were determined.
...
PMID:Syntheses, structures and luminescent properties of new lanthanide-based coordination polymers based on 1,4-benzenedicarboxylate (bdc). 1789 91
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