当前位置： SCI文献检索 > JOURNAL OF MOLECULAR EVOLUTION期刊下所有文献 > Two paralogous genes encoding small subunits of ADP-glucose pyrophosphorylase in maize, Bt2 and L2, replace the single alternatively spliced gene found in other cereal species.

Two paralogous genes encoding small subunits of ADP-glucose pyrophosphorylase in maize, Bt2 and L2, replace the single alternatively spliced gene found in other cereal species.

Abstract：

:Two types of gene encoding small subunits (SSU) of ADP-glucose pyrophosphorylase, a starch-biosynthetic enzyme, have been found in cereals and other grasses. One of these genes encodes two SSU proteins. These are targeted to different subcellular compartments and expressed in different organs of the plant: the endosperm cytosol and the leaf plastids. The SSU gene encoding two proteins evolved from an ancestral gene encoding a single protein by the acquisition of an alternative first exon. Prior to the work reported here, this type of SSU gene had been found in all grasses examined except maize. In maize, two separate genes, Bt2 and L2, were known to have the same roles as the alternatively spliced gene found in other grasses. The evolutionary origin of these maize genes and their relationship to the SSU genes in other grasses were unclear. Here we show that Bt2 and L2 are paralogous genes that arose as a result of the tetraploidization of the maize genome. Both genes derive from an ancestral alternatively spliced SSU gene orthologous to that found in other grasses. Following duplication, the Bt2 and L2 genes diverged in function. Each took a different one of the two functions of the ancestral gene. Now Bt2 encodes the endosperm cytosolic SSU but does not contribute significantly to leaf AGPase activity. Similarly, L2 has lost the use of one of its two alternative first exons. It can no longer contribute to the endosperm cytosolic SSU but is probably responsible for the bulk of the leaf AGPase SSU.

journal_name

J Mol Evol

journal_title

Journal of molecular evolution

authors

Rösti S,Denyer K

doi

10.1007/s00239-007-9013-0

subject

Has Abstract

pub_date

2007-09-01 00:00:00

pages

316-27

issue

3

eissn

0022-2844

issn

1432-1432

journal_volume

65

pub_type

杂志文章

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