A homochiral luminescent compound with four-fold symmetry as a potential chemosensor for nitroanilines

RSC Advances ◽  
2014 ◽  
Vol 4 (88) ◽  
pp. 47249-47253 ◽  
Author(s):  
Navnita Kumar ◽  
Sadhika Khullar ◽  
Sanjay K. Mandal
Keyword(s):  
Crystal Structure ◽  
Amino Acid ◽  
Luminescent Compound

Crystal structure of the first homochiral luminescent compound of a dansylated amino acid (tyrosine) of Cu(ii), [Cu2(HTyr-N-Dan)4(H2O)2]·2H2O (1) (H2Tyr-N-Dan = N-dansyltyrosine), and selective sensing of nitroanilines by both the ligand and 1 are reported.

scholarly journals Crystal structure of Aspergillus fumigatus AroH , an aromatic amino acid aminotransferase

2021 ◽  
Author(s):  
Sharon Spizzichino ◽  
Gioena Pampalone ◽  
Mirco Dindo ◽  
Agostino Bruno ◽  
Luigina Romani ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Amino Acid ◽  
Aspergillus Fumigatus ◽  
Aromatic Amino Acid ◽  
Aromatic Amino Acid Aminotransferase

The first 3′:5′-cyclic nucleotide–amino acid complex:L-His–cIMP

2012 ◽  
Vol 68 (8) ◽  
pp. o311-o316 ◽  
Author(s):  
Katarzyna Ślepokura
Keyword(s):  
Crystal Structure ◽  
Amino Acid ◽  
Cyclic Nucleotide ◽  
Phosphate Group ◽  
Specific Amino Acid ◽  
Π Stacking ◽  
Cyclic Phosphate ◽  
Nucleotide Recognition ◽  
Group Play ◽  
Phosphate Groups

In the crystal structure of the L-His–cIMP complex,i.e.L-histidinium inosine 3′:5′-cyclic phosphate [systematic name: 5-(2-amino-2-carboxyethyl)-1H-imidazol-3-ium 7-hydroxy-2-oxo-6-(6-oxo-6,9-dihydro-1H-purin-9-yl)-4a,6,7,7a-tetrahydro-4H-1,3,5,2λ5-furo[3,2-d][1,3,2λ5]dioxaphosphinin-2-olate], C6H10N3O2+·C10H10N4O7P−, the Hoogsteen edge of the hypoxanthine (Hyp) base of cIMP and the Hyp face are engaged in specific amino acid–nucleotide (His...cIMP) recognition,i.e.by abutting edge-to-edge and by π–π stacking, respectively. The Watson–Crick edge of Hyp and the cIMP phosphate group play a role in nonspecific His...cIMP contacts. The interactions between the cIMP anions (anti/C3′–endo/trans–gauche/chair conformers) are realized mainly between riboses and phosphate groups. The results for this L-His–cIMP complex, compared with those for the previously reported solvated L-His–IMP crystal structure, indicate a different nature of amino acid–nucleotide recognition and interactions upon the 3′:5′-cyclization of the nucleotide phosphate group.

Reactivities of Piperazine-2,5-diones in Radical Bromination Reactions

1996 ◽  
Vol 49 (11) ◽  
pp. 1229 ◽  
Author(s):  
CLL Chai ◽  
DCR Hockless ◽  
AR King
Keyword(s):  
Crystal Structure ◽  
Amino Acid ◽  
Chemical Reactivity ◽  
Trans Isomers ◽  
Radical Bromination ◽  
Conformational Effects ◽  
Cis And Trans Isomers ◽  
The Difference ◽  
Cis And Trans

The reactivities of various N,N'- diacetylated piperazine-2,5-diones towards radical bromination reactions are reported. The studies show that glycyl centres of piperazine-2,5-diones are more reactive towards radical bromination reactions compared to α-substituted amino acid centres. In addition, large differences in reactivities were observed for the cis and trans isomers of N,N'-diacetylated alanine anhydride. Single-crystal structure determination of each isomer revealed that conformational effects may account for the difference in chemical reactivity.

scholarly journals The crystal structure of a xyloglucan-specific endo-β-1,4-glucanase from Geotrichum sp. M128 xyloglucanase reveals a key amino acid residue for substrate specificity

FEBS Journal ◽  
2009 ◽  
Vol 276 (18) ◽  
pp. 5094-5100 ◽  
Author(s):  
Katsuro Yaoi ◽  
Hidemasa Kondo ◽  
Ayako Hiyoshi ◽  
Natsuko Noro ◽  
Hiroshi Sugimoto ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Amino Acid ◽  
Substrate Specificity ◽  
Amino Acid Residue

Studies Directed Towards the Total Synthesis of Anticapsin. X-Ray Crystal-Structure of (1RS,2SR,4RS,5RS,6SR)-5-Hydroxy-2-phthalimido-1-trimethylsilyloxy-bicyclo[2.2.2]octane-2,6-carbolactone

1990 ◽  
Vol 43 (11) ◽  
pp. 1827 ◽  
Author(s):  
MJ Crossley ◽  
TW Hambley ◽  
AW Stamford
Keyword(s):  
Crystal Structure ◽  
Amino Acid ◽  
Total Synthesis ◽  
Synthetic Approach ◽  
Hydrogen Atoms ◽  
Full Matrix ◽  
X Ray ◽  
X Ray Crystallography ◽  
Relative Stereochemistry ◽  
Atomic Parameters

The relative stereochemistry of methyl 2-phthalimido-1- trimethylsilyloxybicyclo[2.2.2]oct-5-ene-2-carboxylate (9) and its 5,6-epoxide (10), intermediates in a synthetic approach to the amino acid antibiotic anticapsin, were established by the TiCl4-mediated cyclization of (10) to the carbolactone (12); the structure of which was proved by single-crystal X-ray crystallography. Full-matrix least- squares refinement of all atomic parameters with individual isotropic thermal parameters for the hydrogen atoms by using 1446 reflections converged at R 0.036. Crystals of (12) are monoclinic, P21/c, a 12.342(3), b 12.239(2), c 13.405(3) Ǻ, β 99.34(2)°, Z 4.

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