Nd 44 SET domain-containing protein sequences from O. sativa (Supplementary Tables S2 and S3) were also extracted for the phylogenetic analysis. Based on canonical KMT proteins, the above 141 SET domain-containing proteins could be grouped into seven distinct classes (Fig. 2), class KMT1, KMT2, KMT3, KMT6, KMT7 and S-ET9, and class RBCMT once named SETD23. KMT1 exhibits H3K9 substrate specificities activity, KMT2/KMT7 for H3K4, KMT3 for H3K36 and KMT6 for H3K27. RBCMT possesses H3K4 and H3K36 methyltransferase activity in animals, but non-histone target specific proteins in plant8,10. The function of S-ET is still unclear. Furthermore, there are 18 members (10 in KMT1A and 8 in KMT1B) in Class KMT1 as the largest family of KMTs in the SET domain-containing proteins, following by 12 members in class RBCMT, while there is only one member in class KMT7 from each examined species.Phylogenetic analysis of SET domain-containing proteins.Gene structure and domain organization of GrKMTs and GrRBCMTs.To understand the evolutionary origin and putative functional diversification, the gene structure of GrKMTs and GrRBCMTs was analyzed in their constitution of introns/exons. Our results showed that the number of introns/exons was various among different GrKMTs and GrRBCMTs. Most of GrKMT and GrRBCMT genes possess multiple exons, except GrKMT1A;2, GrKMT1A;4a/4b/4c/4d and GrS-ET;1/4a with only one (Fig. 3, Supplementary Table S2). Class GrKMT1A consists of relatively order Ascotoxin consistent exon number except GrKMT1A;1a/1b with fifteen, GrKMT1A;3a/3b with two and GrKMT1A;3c with four. Altogether, the number of exons in each class genes is greatly variable, and most of Class GrKMT2 genes contain the largest number of exons. To explore the gene structure, the sequences of full-length GrKMTs and GrRBCMTs were deduced and their domain organization was examined. In GrKMTs, SET domain always locates at the carboxyl terminal of proteins, except Class S-ET and RBCMT. Among the same KMT class, the predicted GrKMTs and GrRBCMTs always share relatively conserved domain organization (Fig. 4, Supplementary Table S3).Scientific RepoRts | 6:32729 | DOI: 10.1038/srepwww.nature.com/scientificreports/Figure 4. Domain organization of GrKMT and GrRBCMT proteins. Domain organization of SET domaincontaining proteins in G. raimondii were detected by SMART and NCBI (http://www.ncbi.nlm.nih.gov/ Structure/cdd/wrpsb.cgi), and the low-complexity filter was turned off, and the Expect Value was set at 10. The site information of domains was subjected to Dog2.0 to construct the proteins organization sketch map.Based on the analysis of protein motifs in Class GrKMT1 proteins, they has mostly associated with SET motif and SRA (SET- and RING-associated) motif facilitating DNA accession and the binding of target genes at the catalytic center24. In Class GrKMT1 proteins, they also possess SET domain boundary domains, Pre-SET and Post-SET domains, which are usually present in other plant species25. Pre-SET is involved in maintaining structural stability and post-SET forms a part of the active site A-836339 web lysine channel26. Besides these typical domains, GrKMT1A;3c/4a also include additional AWS domain (associated with SET domain), which is highly flexible and involved in methylation of lysine residues in histones and other proteins27. Class KMT1B proteins also possessScientific RepoRts | 6:32729 | DOI: 10.1038/srepwww.nature.com/scientificreports/SET and Pre-SET domains except GrKMT1B;3a/3d, which are much.Nd 44 SET domain-containing protein sequences from O. sativa (Supplementary Tables S2 and S3) were also extracted for the phylogenetic analysis. Based on canonical KMT proteins, the above 141 SET domain-containing proteins could be grouped into seven distinct classes (Fig. 2), class KMT1, KMT2, KMT3, KMT6, KMT7 and S-ET9, and class RBCMT once named SETD23. KMT1 exhibits H3K9 substrate specificities activity, KMT2/KMT7 for H3K4, KMT3 for H3K36 and KMT6 for H3K27. RBCMT possesses H3K4 and H3K36 methyltransferase activity in animals, but non-histone target specific proteins in plant8,10. The function of S-ET is still unclear. Furthermore, there are 18 members (10 in KMT1A and 8 in KMT1B) in Class KMT1 as the largest family of KMTs in the SET domain-containing proteins, following by 12 members in class RBCMT, while there is only one member in class KMT7 from each examined species.Phylogenetic analysis of SET domain-containing proteins.Gene structure and domain organization of GrKMTs and GrRBCMTs.To understand the evolutionary origin and putative functional diversification, the gene structure of GrKMTs and GrRBCMTs was analyzed in their constitution of introns/exons. Our results showed that the number of introns/exons was various among different GrKMTs and GrRBCMTs. Most of GrKMT and GrRBCMT genes possess multiple exons, except GrKMT1A;2, GrKMT1A;4a/4b/4c/4d and GrS-ET;1/4a with only one (Fig. 3, Supplementary Table S2). Class GrKMT1A consists of relatively consistent exon number except GrKMT1A;1a/1b with fifteen, GrKMT1A;3a/3b with two and GrKMT1A;3c with four. Altogether, the number of exons in each class genes is greatly variable, and most of Class GrKMT2 genes contain the largest number of exons. To explore the gene structure, the sequences of full-length GrKMTs and GrRBCMTs were deduced and their domain organization was examined. In GrKMTs, SET domain always locates at the carboxyl terminal of proteins, except Class S-ET and RBCMT. Among the same KMT class, the predicted GrKMTs and GrRBCMTs always share relatively conserved domain organization (Fig. 4, Supplementary Table S3).Scientific RepoRts | 6:32729 | DOI: 10.1038/srepwww.nature.com/scientificreports/Figure 4. Domain organization of GrKMT and GrRBCMT proteins. Domain organization of SET domaincontaining proteins in G. raimondii were detected by SMART and NCBI (http://www.ncbi.nlm.nih.gov/ Structure/cdd/wrpsb.cgi), and the low-complexity filter was turned off, and the Expect Value was set at 10. The site information of domains was subjected to Dog2.0 to construct the proteins organization sketch map.Based on the analysis of protein motifs in Class GrKMT1 proteins, they has mostly associated with SET motif and SRA (SET- and RING-associated) motif facilitating DNA accession and the binding of target genes at the catalytic center24. In Class GrKMT1 proteins, they also possess SET domain boundary domains, Pre-SET and Post-SET domains, which are usually present in other plant species25. Pre-SET is involved in maintaining structural stability and post-SET forms a part of the active site lysine channel26. Besides these typical domains, GrKMT1A;3c/4a also include additional AWS domain (associated with SET domain), which is highly flexible and involved in methylation of lysine residues in histones and other proteins27. Class KMT1B proteins also possessScientific RepoRts | 6:32729 | DOI: 10.1038/srepwww.nature.com/scientificreports/SET and Pre-SET domains except GrKMT1B;3a/3d, which are much.
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