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Amino Acid Ligands (amino + acid_ligand)

Distribution by Scientific Domains
Chemistry100%

Selected Abstracts

Copper-Catalyzed Cross-Coupling of Sulfonamides with Aryl Iodides and Bromides Facilitated by Amino Acid Ligands.

CHEMINFORM, Issue 5 2006
Wei Deng
No abstract is available for this article. [source]

Collectin structure: A review

PROTEIN SCIENCE, Issue 9 2000
Kjell Hĺkansson
Abstract Colleetins are animal calcium dependent lectins that target the carbohydrate structures on invading pathogens, resulting in the agglutination and enhanced clearance of the microorganism. These proteins form trimers that may assemble into larger oligomers. Each polypeptide chain consists of four regions: a relatively short N-terminal region, a collagen like region, an ,-helical coiled-coil, and the lectin domain. Only primary structure data are available for the N-terminal region, while the most important features of the collagen-like region can be derived from its homology with collagen. The structures of the ,-helical coiled-coil and the lectin domain are known from crystallographic studies of mannan binding protein (MBP) and lung surfactant protein D (SP-D). Carbohydrate binding has been structurally characterized in several complexes between MBP and carbohydrate; all indicate that the major interaction between carbohydrate and collectin is the binding of two adjacent carbohydrate hydroxyl group to a collectin calcium ion. In addition, these hydroxyl groups hydrogen bond to some of the calcium amino acid ligands. While each collectin trimer contains three such carbohydrate binding sites, deviation from the overall threefold symmetry has been demonstrated for SP-D, which may influence its binding properties. The protein surface between the three binding sites is positively charged in both MBP and SP-D. [source]

Crystallographic report: The [bis(,5 -cyclopentadienyl)titanium(IV)-bis(L -methionine)] dichloride

APPLIED ORGANOMETALLIC CHEMISTRY, Issue 6 2004
Radim Bína
Abstract The structure of ionic complex [Cp2Ti(L -Met)2]2+[Cl,]2 (where Cp = ,5 -C5H5) possessing C2 symmetry is presented. Discrete cationic units with distorted tetrahedral geometry around the central titanium atom are connected through intermolecular H···Cl bonds between ammonium group protons of ,-amino acid ligands and chloride anions. Copyright © 2004 John Wiley & Sons, Ltd. [source]

Amino Acid Ligand Chirality for Enantioselective Syntheses

CHEMISTRY & BIODIVERSITY, Issue 6 2010
Károly Micskei
Abstract Amino acids are attractive sources of chirality in stoichiometric or catalytic transition metal/organic chemistry. In spite of easy availability and other advantages, the application of these ligands is hindered by several problems. Now, at the dawn of emerging d- amino acid biochemistry, efforts in this direction are becoming increasingly important. The results of research on application of amino acid ligands for transition-metal reagents in organic syntheses are reviewed in the present work. [source]