69113-63-9 Purity
95%
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Specification
The binding of methyl β-lactoside and all possible monodeoxy derivatives of methyl β-lactoside to the galactose-specific highly cytotoxic lectin ricin has been studied. The distribution of low-energy conformers of the disaccharide structure has first been determined using molecular mechanics calculations and high-resolution NMR spectroscopy. The observed nuclear Overhauser enhancement and specific deshielding are consistent with a similar distribution of low-energy conformers for all investigated compounds, which can be described by major conformers defined by cp (H1'-C1'-01'-C4), w (C1'-01'-C4-H4) torsion angles of 49" and 5", respectively, with contributions from conformers with angles cp/w 24"/59", 22"/32" and 6"/44". Assuming that the disaccharide binds to the lectin in these preferred conformations, the apparent dissociation constants of the ricin disaccharide complexes have been interpreted in terms of specific polar and nonpolar interactions. In agreement with the X-ray data, the hydroxyl groups at positions 3, 4, and 6 of the P-D-galactopyranose moiety behave as key polar groups in the interaction with ricin.
The coordinates of the constituent glucose and galactose residues were obtained by molecular mechanics calculations and modified as needed for the different derivatives. The methyl groups at the reducing glucose residues were oriented at a 55" cp angle, in accordance with previous findings for several methyl fl-D-pyranosides 1441. For each conformer, energy values were found for the combination of gg and gt for the side chains of the glucose residues, although in one of the conformers (conformer C), their cp/y values differed. The gt orientation of the galactose residues was used for the geometry optimization of 4-8, and the gg and gt orientations of the side chains of the glucose moiety were calculated simultaneously. A new local minimum was detected by this approach.
The molecular formula of methyl lactoside is C13H24O11.
The synonyms of methyl lactoside are Methyl beta-lactoside, BETA-METHYLLACTOSIDE, and Methyl-beta-lactoside.
The molecular weight of methyl lactoside is 356.32 g/mol.
Methyl lactoside is described as a methyl glycoside comprising methyl beta-D-glucoside having a beta-D-galactosyl residue at the 4-position. It is functionally related to beta-lactose.
The IUPAC name of methyl lactoside is (2S,3R,4S,5R,6R)-2-[(2R,3S,4R,5R,6R)-4,5-dihydroxy-2-(hydroxymethyl)-6-methoxyoxan-3-yl]oxy-6-(hydroxymethyl)oxane-3,4,5-triol.
The InChI of methyl lactoside is InChI=1S/C13H24O11/c1-21-12-10(20)8(18)11(5(3-15)23-12)24-13-9(19)7(17)6(16)4(2-14)22-13/h4-20H,2-3H2,1H3/t4-,5-,6+,7+,8-,9-,10-,11-,12-,13+/m1/s1.
The InChIKey of methyl lactoside is FHNIYFZSHCGBPP-ABBMIVAOSA-N.
The CAS number of methyl lactoside is 7216-69-5.
The UNII of methyl lactoside is 868YEO5270.
The formal charge of methyl lactoside is 0.