Abstract

MEDINA, Isabel; RODES, Rosa  and  KUEHN, Christina. ADVANCES IN KNOWLEDGE OF SUCROSE-binding proteins in monocot plants. A NEW CARRIER IN SUGAR CANE. cultrop [online]. 2010, vol.31, n.4, pp. 00-00. ISSN 0258-5936.

Sucrose transporters have a pivotal role in sucrose transport through membranes and its distribution along the plant from source tissues to sinks and among different sinks. Although a sucrose-transporting protein has been postulated since late 70´s, it was not proved until 1992, when the first DNAc sequence of a sucrose transporter was identified in Spinacea oleracea, which was subjected to functional, biochemical and structural analyses. The first sucrose transporter identified in monocotyledon plants was in Oryza sativa, 1997, followed by the other four in O. sativa, Zea mays (3), Triticum aestivum (3), Hordeum vulgare (2), Saccharum hybrid (1), Ananas comosus (1), Bambusa oldhamii (1) and Sorghum bicolor (2). This paper intends to review the current knowledge about sucrose transporters in these plants, besides presenting the first evidence of a second sucrose transporter in Saccharum hybrid, ShSUT4. This protein has a high identity deduced sequence with renowned functionality transporters and, similar to them, it has been predicted to possess a secondary structure of 12 transmembrane domains. Finally, it has also been spotted in the tonoplast, like some other sucrose transporters of Clade SUT4 in the phylogenetic tree.

Keywords : sucrose transporter; monocotyledon plants; sugarcane.

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