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The system of galactans from Cryptonemia crenulata (Halymeniaceae, Halymeniales) and the structure of two major fractions. Kinetic studies on the alkaline cyclization of the unusual diad G2S-->D(L)6S.
Carbohydr Res. 2005 Mar 21; 340(4):711-22.CR

Abstract

Cryptonemia crenulata biosynthesizes a family of dl-hybrid galactans that are based on the classical 3-linked beta-d-galactopyranosyl-->4-linked alpha-galactopyranosyl alternating sequence (A-units-->B-units). The dispersion of structures in these galactans is based on four factors, namely: (a) the amount and position of substituent groups as sulfate (major), pyruvic acid ketals, methoxyl and side substituents of beta-D-xylose and/or beta-D-galactose; (b) the ratio galactose/3,6-anhydrogalactose in the B-units; (c) the ratio D-/L-galactoses and 3,6-anhydrogalactoses also in the B-units and (d) the sequence of the diads in the linear backbone. Alkali treatment carried out on the major fraction produced a nearly quantitative formation of 3,6-anhydrogalactose units from precursor units (alpha-galactose 6-sulfate (major) and alpha-galactose 2,6-sulfate, minor). Kinetic studies show a rate constant, for the diad G2S-D(L) 6-S, of 1.7 x 10(4)s(-1) indicating a reaction faster than in lambda-carrageenans but slower than in porphyrans.

Authors+Show Affiliations

Departamento de Bioquímica e Biologia, Molecular, Universidade Federal do Paraná, PO Box 19046, CEP: 81531-990 Curitiba-Paraná, Brazil.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

15721344

Citation

Zibetti, Rosiane G M., et al. "The System of Galactans From Cryptonemia Crenulata (Halymeniaceae, Halymeniales) and the Structure of Two Major Fractions. Kinetic Studies On the Alkaline Cyclization of the Unusual Diad G2S-->D(L)6S." Carbohydrate Research, vol. 340, no. 4, 2005, pp. 711-22.
Zibetti RG, Noseda MD, Cerezo AS, et al. The system of galactans from Cryptonemia crenulata (Halymeniaceae, Halymeniales) and the structure of two major fractions. Kinetic studies on the alkaline cyclization of the unusual diad G2S-->D(L)6S. Carbohydr Res. 2005;340(4):711-22.
Zibetti, R. G., Noseda, M. D., Cerezo, A. S., & Duarte, M. E. (2005). The system of galactans from Cryptonemia crenulata (Halymeniaceae, Halymeniales) and the structure of two major fractions. Kinetic studies on the alkaline cyclization of the unusual diad G2S-->D(L)6S. Carbohydrate Research, 340(4), 711-22.
Zibetti RG, et al. The System of Galactans From Cryptonemia Crenulata (Halymeniaceae, Halymeniales) and the Structure of Two Major Fractions. Kinetic Studies On the Alkaline Cyclization of the Unusual Diad G2S-->D(L)6S. Carbohydr Res. 2005 Mar 21;340(4):711-22. PubMed PMID: 15721344.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The system of galactans from Cryptonemia crenulata (Halymeniaceae, Halymeniales) and the structure of two major fractions. Kinetic studies on the alkaline cyclization of the unusual diad G2S-->D(L)6S. AU - Zibetti,Rosiane G M, AU - Noseda,Miguel D, AU - Cerezo,Alberto S, AU - Duarte,Maria E R, PY - 2004/08/26/received PY - 2005/01/12/accepted PY - 2005/2/22/pubmed PY - 2005/7/20/medline PY - 2005/2/22/entrez SP - 711 EP - 22 JF - Carbohydrate research JO - Carbohydr Res VL - 340 IS - 4 N2 - Cryptonemia crenulata biosynthesizes a family of dl-hybrid galactans that are based on the classical 3-linked beta-d-galactopyranosyl-->4-linked alpha-galactopyranosyl alternating sequence (A-units-->B-units). The dispersion of structures in these galactans is based on four factors, namely: (a) the amount and position of substituent groups as sulfate (major), pyruvic acid ketals, methoxyl and side substituents of beta-D-xylose and/or beta-D-galactose; (b) the ratio galactose/3,6-anhydrogalactose in the B-units; (c) the ratio D-/L-galactoses and 3,6-anhydrogalactoses also in the B-units and (d) the sequence of the diads in the linear backbone. Alkali treatment carried out on the major fraction produced a nearly quantitative formation of 3,6-anhydrogalactose units from precursor units (alpha-galactose 6-sulfate (major) and alpha-galactose 2,6-sulfate, minor). Kinetic studies show a rate constant, for the diad G2S-D(L) 6-S, of 1.7 x 10(4)s(-1) indicating a reaction faster than in lambda-carrageenans but slower than in porphyrans. SN - 0008-6215 UR - https://www.unboundmedicine.com/medline/citation/15721344/The_system_of_galactans_from_Cryptonemia_crenulata__Halymeniaceae_Halymeniales__and_the_structure_of_two_major_fractions__Kinetic_studies_on_the_alkaline_cyclization_of_the_unusual_diad_G2S__>D_L_6S_ DB - PRIME DP - Unbound Medicine ER -