Occurrence of sulfated galactans in marine angiosperms: evolutionary implications

被引:88
作者
Aquino, RS
Landeira-Fernandez, AM
Valente, AP
Andrade, LR
Mourao, PAS
机构
[1] Hosp Univ Clementino Fraga Filho, Lab Tecido Conjunt, BR-21941590 Rio De Janeiro, Brazil
[2] Univ Fed Rio de Janeiro, Inst Ciencias Biomed, Dept Bioquim Med, BR-21941590 Rio De Janeiro, Brazil
[3] Univ Fed Rio de Janeiro, Ctr Ressonancia Nucl Magnet Macromol, BR-21941 Rio De Janeiro, Brazil
[4] Univ Fed Rio de Janeiro, Inst Ciencias Biomed, Dept Histol & Embriol, Lab Biomineralizacao, BR-21941 Rio De Janeiro, Brazil
关键词
evolution of marine organisms; marine angiosperms; seagrass; sulfated galactans; sulfated polysaccharides;
D O I
10.1093/glycob/cwh138
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
We report for the first time that marine angiosperms (seagrasses) possess sulfated polysaccharides, which are absent in terrestrial and freshwater plants. The structure of the sulfated polysaccharide from the seagrass Ruppia maritima was determined. It is a sulfated D-galactan composed of the following regular tetrasaccharide repeating unit: [3-beta-D-Gal-2(OSO3)-1-->4-alpha-D-Gal-1-->4-alpha-D-Gal-1-->3-beta-D-Gal-4(OSO3)-1-->]. Sulfated galactans have been described previously in red algae and in marine invertebrates (ascidians and sea urchins). The sulfated galactan from the marine angiosperm has an intermediate structure when compared with the polysaccharides from these two other groups of organisms. Like marine invertebrate galactan, it expresses a regular repeating unit with a homogenous sulfation pattern. However, seagrass galactan contains the D-enantiomer of galactose instead of the L-isomer found in marine invertebrates. Like red algae, the marine angiosperm polysaccharide contains both alpha and beta units of D-galactose; however, these units are not distributed in an alternating order, as in algal galactan. Sulfated galactan is localized in the plant cell walls, mostly in rhizomes and roots, indicative of a relationship with the absorption of nutrients and of a possible structural function. The occurrence of sulfated galactans in marine organisms may be the result of physiological adaptations, which are not correlated with phylogenetic proximity. We suggest that convergent adaptation, due to environment pressure, may explain the occurrence of sulfated galactans in many marine organisms.
引用
收藏
页码:11 / 20
页数:10
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