Abstract
Sucrose synthase (SUS) is a key enzyme in sucrose metabolism. This enzyme catalyzes the reversible conversion of sucrose and UDP to UDP-glucose and fructose. In the Arabidopsis SUS gene family (six members), SUS2 is strongly and specifically expressed in Arabidopsis seeds during the maturation phase. Using specific antibodies, we have shown that SUS2 is localized in the embryo, endosperm and seed coat with differential patterns. During the maturation phase, the SUS2 protein seems to be mainly co-localized with plastids in the embryo. This novel finding is discussed in relation to the role of this enzyme in storage organs.
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