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Structural analysis of leuconostoc dextrans containing 3-O-α-d-glucosylated α-d-glucosyl residues in both linear-chain and branch-point positions, or only in branch-point positions, by methylation and by 13C-N.M.R. spectroscopy by Fred K. Seymour; Roger D. Knapp; Edward C.M. Chen; Stephen H. Bishop; Allene Jeanes is a Biochemistry, Genetics and Molecular Biology article available to read on EtoBox.

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It had been established by methylation-structural analysis that dextran fraction S from Leuconostoc mesenteroides NRRL B-1355 has two types of a-D-glucopyranosyl residues that are linked through O-3, i.e., 35 % of the residues carry a (l-+3)-bond, and -10 % carry a (l-+6)-bond in addition to a (l-+3)-bond. Two similarly constituted dextrans have now been identified by methylation-structural analysis, namely, the S-type fractions from L. mesenteroides strains NRRL B-1498 and B-1501. The S-type fractions from L. mesenteroides strains B-1355, B-1498, and B-1501 are structurally differentiated from the a-D-glucans (characteristically insoluble) of certain cariogenic Streptococci which also contain both 3-O-and 3,6-di-O-substituted a-D-glucopyranosyl residues. 13C-N.m.r. spectra have been recorded at 90" for both the S-and L-type fractions of strains B-1355, B-1498, and B-1501. The L-type fractions have a low degree of branching through 3,6-di-O-substituted c+D-glucopyranosyl residues, but no 3-mono-O-substituted residues. (Dextran fraction S of Streptococcus \*Unusual Dextrans, Part VIII. For Part VII, see ref. 1.

Who reads Structural analysis of leuconostoc dextrans containing 3-O-α-d-glucosylated α-d-glucosyl residues in both linear-chain and branch-point positions, or only in branch-point positions, by methylation and by 13C-N.M.R. spectroscopy?

Author

Fred K. Seymour; Roger D. Knapp; Edward C.M. Chen; Stephen H. Bishop; Allene Jeanes

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0008-6215)

Published

1979

Language

EN

Field

Biochemistry, Genetics and Molecular Biology (Life Sciences)