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Literature summary for 2.4.1.207 extracted from

  • Rose, J.K.C.; Brummell, D.A.; Bennett, A.B.
    Two divergent xyloglucan endotransglycosylases exhibit mutually exclusive patterns of expression in nasturtium (1996), Plant Physiol., 110, 493-499.
    View publication on PubMedView publication on EuropePMC
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Cloned(Commentary)

Cloned (Comment) Organism
genes XET1 and NXG1 encode 2 enzyme forms, XET1 cDNA is cloned and sequenced, amino acid sequence of NGX1 Tropaeolum majus

Natural Substrates/ Products (Substrates)

Natural Substrates Organism Comment (Nat. Sub.) Natural Products Comment (Nat. Pro.) Rev. Reac.
donor xyloglucan + xyloglucan acceptor Tropaeolum majus existence of different classes of XET with differing roles in vivo ?
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 ?
donor xyloglucan + xyloglucan acceptor Tropaeolum majus XET1 may play a role in cell-wall xyloglucan metabolism, such as the incorporation of newly synthesized xyloglucan into the expanding primary cell wall or the modification of xyloglucan polymers forming cross-links between cellulose microfibrils, NXG1 in vivo predominantly exhibits xyloglucanase activity and mobilizes nonfucosylated xyloglucan seed storage reserves ?
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 ?

Organism

Organism UniProt Comment Textmining
Tropaeolum majus
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 var. Fiery Festival, 2 enzyme forms encoded by the genes XET1 and NXG1
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Source Tissue

Source Tissue Comment Organism Textmining
cotyledon NXG1 is exclusively expressed in cotyledons Tropaeolum majus
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epicotyl XET1 is highly expressed in young epicotyls Tropaeolum majus
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leaf XET1 is expressed in young and mature leaves at lower levels than in young epicotyls and roots, 7fold higher expression in young leaves than in mature ones Tropaeolum majus
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additional information XET1 is not expressed in cotyledons Tropaeolum majus
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root XET1 is highly expressed in young roots Tropaeolum majus
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stem XET1 is expressed at lower levels in stems than in young epicotyls and roots Tropaeolum majus
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Substrates and Products (Substrate)

Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
donor xyloglucan + acceptor xyloglucan 2 distinct XETs with different substrate prefences, XET from epicotyl, XET1, uses nonfucosylated seed amyloid xyloglucan or fucosylated stem xyloglucan as substrate with equal facility, XET from cotyledon, NXG1, has a significantly higher activity against nonfucosylated xyloglucan Tropaeolum majus ?
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 ?
donor xyloglucan + Xylalpha(1-6)Glcbeta(1-4)(Galbeta(1-2)Xylalpha(1-6))Glcbeta(1-4)(Galbeta(1-2)Xylalpha(1-6))Glcbeta(1-4)Glc XLLG Tropaeolum majus ?
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 ?
donor xyloglucan + Xylalpha(1-6)Glcbeta(1-4)(Galbeta(1-2)Xylalpha(1-6))Glcbeta(1-4)(Galbeta(1-2)Xylalpha(1-6))Glcbeta(1-4)Glc XLLG from Tropaeolum majus seed, donor xyloglucan from tamarind cotyledons or pea stems, XET1 uses nonfucosylated tamarind seed amyloid xyloglucan or fucosylated pea stem xyloglucan as substrate with equal facility, NXG1 has a significantly higher activity against nonfucosylated tamarind xyloglucan Tropaeolum majus ?
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 ?
donor xyloglucan + xyloglucan acceptor existence of different classes of XET with differing roles in vivo Tropaeolum majus ?
-
 ?
donor xyloglucan + xyloglucan acceptor XET1 may play a role in cell-wall xyloglucan metabolism, such as the incorporation of newly synthesized xyloglucan into the expanding primary cell wall or the modification of xyloglucan polymers forming cross-links between cellulose microfibrils, NXG1 in vivo predominantly exhibits xyloglucanase activity and mobilizes nonfucosylated xyloglucan seed storage reserves Tropaeolum majus ?
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 ?