Myb转录因子学习.pptx
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1、MYB transcription factors in plantsMore than 20 years ago,the first gene encoding a transcription factor in plants was identified COLORED1(C1)A decade ago,the Arabidopsis genome sequence was published,which provided the first comprehensive description and classification of plant MYB genes.In rencent
2、 years,the functions of MYB proteins have been investigated in numerous plant species.第1页/共20页第一页,编辑于星期六:九点 五十一分。Structure and evolutionMYB proteins are characterized by a highly conserved DNA-binding domain:the MYB domain(consists of up to four imperfect amino acid sequence repeats(R)of about 52 am
3、ino acids,each forming three ahelices).MYB proteins can be divided into different classes depending on the number of adjacent repeats(one,two,three or four)第2页/共20页第二页,编辑于星期六:九点 五十一分。第3页/共20页第三页,编辑于星期六:九点 五十一分。In contrast to the highly conserved MYB domain,the other regions of R2R3-MYB proteins are
4、highly variable.Based on the conservation of the DNAbinding domain and of amino acid motifs in the C terminal domains,R2R3-MYB proteins have been divided into subgroups.第4页/共20页第四页,编辑于星期六:九点 五十一分。第5页/共20页第五页,编辑于星期六:九点 五十一分。Diversity of functionsNumerous R2R3-MYB proteins have been characterized by g
5、enetic approaches and found to be involved in the control of plant-specific processes including:(i)primary and secondary metabolism(ii)cell fate and identity(iii)developmental processes(iv)responses to biotic and abiotic stresses第6页/共20页第六页,编辑于星期六:九点 五十一分。第7页/共20页第七页,编辑于星期六:九点 五十一分。Regulation of MYB
6、 functionsMYB genes are targets to both microRNAs(miRNAs)and transacting,silencing RNAs(ta-siRNAs).Post-translational modifications and proteinprotein interactions can significantly impact the regulatory activity of MYB transcription factors.The transcriptional activity of some R2R3-MYB factors is d
7、ependent in vivo on proteinprotein interactions.Phosphorylation is important in determining MYB protein activity.第8页/共20页第八页,编辑于星期六:九点 五十一分。Redox control is thought to influence MYB protein activity because of the presence of a pair of conserved Cys residues,four residues apart,in the R2-MYB motif o
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