Pnueli L. et al 1991
- Authors:
Pnueli L. Abu-Abeid M. Zamir D. Nacken W. Schwarz-Sommer Z. Lifschitz
E.
- Title:
The MADS box gene family in tomato: temporal expression during floral
development, conserved secondary structures and homology with homeotic
genes from Antirrhinum and Arabidopsis.
- Reference location:
Plant Journal. 1(2):255-66, 1991 Sep.
- Abstract:
Five genes with homology to the floral homeotic genes deficiens of
Antirrhinum and agamous of Arabidopsis were isolated from tomato. Each of
the five genes is unique in the genome and could be localized to a
different chromosome by RFLP mapping. Four of the tomato genes (hereafter
TM) are flower-specific with distinguishable temporal expression. TM4 and
TM8 are 'early', while TM5 and TM6 are 'late' genes. TM4 is homologous to
squamous and TM6 is similar to deficiens, which are, respectively, 'early'
and 'late' bona fide homeotic genes in Antirrhinum. The proteins encoded
by the five tomato genes, like several known homeotic genes from other
plants, contain within their N-terminus a highly conserved DNA-binding
domain, the MADS box. All known plant MADS box genes also share, however,
other properties. They all contain a central, moderately conserved, and
rather basic domain, and a highly divergent or even missing C-terminal
domain. Furthermore, molecular modelling predicts the presence of a
conserved amphipatic alpha helix, at a constant distance from the MADS box
in each of these proteins. The common properties of eight MADS box
proteins from three plant families indicate that all their domains were
coded for by the same ancestor gene. The sequence homology between pairs
of MADS genes from different species indicates that the MADS ancestor gene
multiplied and diverged in an ancestor plant common to several dicotyledon
families.
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