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Titolo:
VARIATIONS OF LECTIN-BINDING SITES IN EXTRACELLULAR GLYCOCONJUGATES DURING THE LIFE-CYCLE OF NOSTOC PUNCTIFORME, A POTENTIALLY ENDOSYMBIOTIC CYANOBACTERIUM
Autore:
SCHUSSLER A; MEYER T; GEHRIG H; KLUGE M;
Indirizzi:
UNIV HEIDELBERG,ZELLENLEHRE,NEUENHEIMER FELD 230 D-69120 HEIDELBERG GERMANY TH DARMSTADT,INST BOT D-64287 DARMSTADT GERMANY
Titolo Testata:
European journal of phycology
fascicolo: 3, volume: 32, anno: 1997,
pagine: 233 - 239
SICI:
0967-0262(1997)32:3<233:VOLSIE>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
GEOSIPHON-PYRIFORME; SYMBIOSIS; MICROSCOPY; FUNGUS; HORMOGONIUM; DESICCATION; ASSOCIATION; WETTSTEIN; GLOMALES; SYSTEM;
Keywords:
CYANOBACTERIA; EXTRACELLULAR GLYCOCONJUGATES; LECTINS; NOSTOC PUNCTIFORME; SYMBIOSIS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
29
Recensione:
Indirizzi per estratti:
Citazione:
A. Schussler et al., "VARIATIONS OF LECTIN-BINDING SITES IN EXTRACELLULAR GLYCOCONJUGATES DURING THE LIFE-CYCLE OF NOSTOC PUNCTIFORME, A POTENTIALLY ENDOSYMBIOTIC CYANOBACTERIUM", European journal of phycology, 32(3), 1997, pp. 233-239

Abstract

Nostoc punctiforme is the microsymbiont of the unique fungal endocyanosis Geosiphon pyriforme. During the establishment of this endosymbiosis fungal hyphae incorporate a specific stage of the N. punctiforme life cycle, formed during differentiation from the motile hormogonium tothe non-motile primordium stage. The life cycle of N. punctiforme wassynchronized by first inducing hormogonium differentiation by red light illumination for 36 h, followed by applying light/dark cycles for 96 tl. Different developmental stages of N. punctiforme including hormogonia, primordia and vegetative colonies were analysed by fluorescein isothiocyanate (FITC)-conjugated lectins with sugar specificity to alpha-D-mannose/alpha-D-glucose, N-acetyl-beta-D-glucosamine oligomers, alpha-L-fucose, beta-D-galactose, alpha-D-galactose, N-acetyl-alpha-D-galactosamine and sialic acid. Lectin binding properties indicate that the slime produced by the motile hormogonia contains beta-D-galactosyland alpha-L-fucosyl residues, which disappear during further development. There is a clear correlation between the transition from the hormogonium to the non-motile primordium stage and the appearance of a large amount of alpha-D-mannosyl (or alpha-D-glucosyl) residues in the extracellular slime. This strongly Concanavalin A (Con A)-positive compound is lost in part during later differentiation into vegetative colonies. Consequently these significant changes in the Nostoc slime, occurring at the developmental stage involved in the establishment of the Geosiphon symbiosis, could play a role in the specific recognition between the symbiosis partners.

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Documento generato il 13/07/20 alle ore 16:33:01