A Class of Lectins Present in the Tissues of Seed Plants

Jermyn, MA; Yeow, YM; Woods, EF

doi:10.1071/pp9750501

Cited by 150 publications

(90 citation statements)

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“…Although this early survey work was largely based on positive reactivity of plant extracts or tissue sections with Yariv reagent, other tools were subsequently used to confirm that numerous angiosperms, gymnosperms and lower plants (e. g. bryophytes, algae) contain AGPs [29,40,[59][60][61]. …”

Section: Agp Expression In the Plant Kingdommentioning

confidence: 99%

Arabinogalactan-proteins: structure, expression and function

Showalter

2001

CMLS, Cell. Mol. Life Sci.

525

480

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Abstract. Arabinogalactan-proteins (AGPs) are a family of extensively glycosylated hydroxyproline-rich glycoproteins that are thought to have important roles in various aspects of plant growth and development. After a brief introduction to AGPs highlighting the problems associated with defining and classifying this diverse family of glycoproteins, AGP structure is described in terms of the protein component (including data from molecular cloning), carbohydrate component, processing of AGPs (including recent data on glycosylphosphatidylinositol membrane anchors) and overall molecular shape. Next, the expression of AGPs is examined at several different levels, from the whole plant to the cellular levels, using a variety of experimental techniques and tools. Finally, AGP function is considered. Although the existing functional evidence is not incontrovertible, it does clearly droxyproline poor, lightly glycosylated and largely unreactive with Yariv reagent. It is worth remembering that it is human nature to group and classify things to facilitate their comprehension and discourse, whereas Mother Nature simply constructs biological entities, including AGPs, using material at hand with blatant, pedagogical disregard. Structure Protein moietyKnowledge of the protein moieties of AGPs has mostly come from purifying AGPs, deglycosylating them and analyzing their respective core proteins by amino acid analysis and, to a more limited extent, by sequence analysis ( fig. 2) [3 -10]. More recently, molecular cloning of several confirmed and putative AGP core proteins has CMLS, Cell. Mol. Life Sci. 58 (2001) 1399 -1417 1420-682X/01/101399-19 $ 1.50 + 0.20/0 © Birkhäuser Verlag, Basel, 2001 CMLS Cellular and Molecular Life Sciences point to roles for AGPs in vegetative, reproductive, and cellular growth and development as well as programmed cell death and social control. In addition and most likely inextricably linked to their functions, AGPs are presumably involved in molecular interactions and cellular signaling at the cell surface. Some likely scenarios are discussed in this context. AGPs also have functions of real or potential commercial value, most notably as emulsifiers in the food industry and as potential immunological regulators for human health. Several important questions remain to be answered with respect to AGPs. Clearly, elucidating the unequivocal functions of particular AGPs and relating these functions to their respective structures and modes of action remain as major challenges in the years ahead.

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Section: Agp Expression In the Plant Kingdommentioning

confidence: 99%

Arabinogalactan-proteins: structure, expression and function

Showalter

2001

CMLS, Cell. Mol. Life Sci.

525

480

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“…The components of the papillar surface include a fl-glycosyl binding polymer, the "all-fl lectin" described in the seeds of many plants (21). This polymer is apparently identical with a component of the guide mucilaget and is therefore unlikely to be involved in the recognition events, but is more likely to function as a nutrient source and physical support for the developing pollen tube, as well as acting as an adhesive for capturing pollen grains at the stigma surface.…”

Section: Methodsmentioning

confidence: 99%

Cell recognition in plants: Determinants of the stigma surface and their pollen interactions

Knox

Clarke

Harrison

et al. 1976

Proc. Natl. Acad. Sci. U.S.A.

123

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The interaction between compatible pollen grains and the female stigma of Gladiolus gandavensis has been used as a model system for investigation of cell recognition in plants. The Cells of virtually all eukaryotic organisms possess some capacity to distinguish self from not-self (1). Processes reflecting this recognition capacity have been extensively explored in animal systems (2), but plants have been largely neglected. However, recognition between compatible pollen and the female stigma in plants provides a model system for cell recognition which is genetically specified (3), and in which transfer of information has been demonstrated both for pollen, which carries the male gametes (4), and the stigma surface (5). In this communication we describe the recognition events in the self-compatible system of Gladiolus, whose pollen walls are known to contain a range of proteins in both exine and intine sites (6). We have investigated the molecular architecture of the external stigma surface with a view to demonstrating surface receptors. (7) showed that the dialyzed and dried extract contained 25% sodium deoxycholate and 17% MATERIALS AND METHODS

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“…The type II AGPs are a major secretory material found in the medium of cells from all flowering plants grown in liquid culture (Anderson etal., 1977; Aspinall et a/., 1969), but pulsechase studies have shown that they are at least transiently attached to the wall before they are secreted to the medium (Takeuchi and Komamine, 1980). The transient attachment may reflect that soluble AGPs constitute a class of 'p-lectins', a term describing their unique ability to bind specifically to p-linked hexose units (Jermyn and Yeow, 1975). We have proposed that AGPs chaperone some non-cellulosic p-o-glycans to their appropriate extracellular sites of assembly (Carpita and Gibeaut, 1988), but this proposal needs firm data.…”

Section: The Pectin Matrixmentioning

confidence: 99%

Structural models of primary cell walls in flowering plants: consistency of molecular structure with the physical properties of the walls during growth

1993

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SummaryAdvances in determination of polymer structure and in preservation of structure for electron microscopy provide the best view to date of how polysaccharides and structural proteins are organized into plant cell walls. The walls that form and partition dividing cells are modified chemically and structurally from the walls expanding to provide a cell with its functional form. In grasses, the chemical structure of the wall differs from that of all other flowering plant species that have been examined. Nevertheless, both types of wall must conform to the same physical laws. Cell expansion occurs via strictly regulated reorientation of each of the wall's components that first permits the wall to stretch in specific directions and then lock into final shape. This review integrates information on the chemical structure of individual polymers with data obtained from new techniques used to probe the arrangement of the polymers within the walls of individual cells. We provide structural models of two distinct types of walls in flowering plants consistent with the physical properties of the wall and its components.

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A Class of Lectins Present in the Tissues of Seed Plants

Cited by 150 publications

References 0 publications

Arabinogalactan-proteins: structure, expression and function

Arabinogalactan-proteins: structure, expression and function

Cell recognition in plants: Determinants of the stigma surface and their pollen interactions

Structural models of primary cell walls in flowering plants: consistency of molecular structure with the physical properties of the walls during growth

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