ABSTRACT
A new member of the GT-2 family of transcription factors, GmGT-2, was isolated from soybean while screening a cDNA library with a protein binding site (D1) in the promoter of Aux28, a member of the Aux/IAA family of auxin-responsive genes. GmGT-2 possesses various primary amino acid sequence characteristics common to all GT-2 factors thus far isolated, including sequence identity in the twin trihelix DNA-binding domains. Recombinant GmGT-2 expressed in Escherichia coli binds oligotetramers of both D1 and various GT-boxes. However, unlike other known members of the GT-2 family, GmGT-2 message levels are down-regulated by light in a phytochrome-dependent manner. Evidence is presented that the expression levels of Aux28 mRNA are also down-regulated by phytochrome. These results and other referenced data implicate the possible convergence of phytochrome and auxin signaling pathways.
Subject(s)
Glycine max/genetics , Light , Phytochrome/physiology , Transcription Factors/genetics , Amino Acid Sequence , DNA, Complementary/chemistry , DNA, Complementary/genetics , DNA, Complementary/isolation & purification , DNA, Plant/chemistry , DNA, Plant/genetics , DNA, Plant/metabolism , DNA-Binding Proteins/genetics , DNA-Binding Proteins/metabolism , Down-Regulation , Gene Expression Regulation, Developmental/radiation effects , Gene Expression Regulation, Plant/radiation effects , Hypocotyl/genetics , Hypocotyl/growth & development , Hypocotyl/metabolism , Indoleacetic Acids/pharmacology , Molecular Sequence Data , Plant Proteins/drug effects , Plant Proteins/genetics , Promoter Regions, Genetic/drug effects , Promoter Regions, Genetic/genetics , Protein Binding/radiation effects , RNA, Messenger/genetics , RNA, Messenger/metabolism , Sequence Alignment , Sequence Analysis, DNA , Sequence Homology, Amino Acid , Glycine max/growth & development , Transcription, GeneticABSTRACT
The authors report the results of 1258 chemical synovectomies carried out in subjects with rheumatoid polyarthritis on joints at Steinbrocker stage I and of 470 chemical synovectomies carried out during the first year of evolution of rheumatoid polyarthritis. Comparison with the results of chemical synovectomy carried out later demonstrate the superiority of early chemical synovectomy.
