4IGQ

Histone H3 Lysine 4 Demethylating Rice JMJ703 in complex with methylated H3K4 substrate

Summary for 4IGQ

• Entry DOI: 10.2210/pdb4igq/pdb
• Related: 4IGO 4IGP
• Descriptor: Os05g0196500 protein, mathylated H3K4 substrate, FE (III) ION, ... (5 entities in total)
• Functional Keywords: jumonjic, histone demethylase, structural protein-transcription complex, structural protein/transcription
• Biological source: Oryza sativa Japonica Group (Japanese rice); More
• Total number of polymer chains: 2
• Total formula weight: 41589.45

Authors

Chen, Q.F.,Chen, X.S.,Wang, Q.,Zhang, F.B.,Lou, Z.Y.,Zhang, Q.F.,Zhou, D.X. (deposition date: 2012-12-17, release date: 2013-04-03, Last modification date: 2023-11-08)

Primary citation

Chen, Q.,Chen, X.,Wang, Q.,Zhang, F.,Lou, Z.,Zhang, Q.,Zhou, D.X.
Structural basis of a histone H3 lysine 4 demethylase required for stem elongation in rice.
PLoS Genet., 9:e1003239-e1003239, 2013

PubMed Abstract: Histone lysine methylation is an important epigenetic modification in regulating chromatin structure and gene expression. Histone H3 lysine 4 methylation (H3K4me), which can be in a mono-, di-, or trimethylated state, has been shown to play an important role in gene expression involved in plant developmental control and stress adaptation. However, the resetting mechanism of this epigenetic modification is not yet fully understood. In this work, we identified a JmjC domain-containing protein, JMJ703, as a histone lysine demethylase that specifically reverses all three forms of H3K4me in rice. Loss-of-function mutation of the gene affected stem elongation and plant growth, which may be related to increased expression of cytokinin oxidase genes in the mutant. Analysis of crystal structure of the catalytic core domain (c-JMJ703) of the protein revealed a general structural similarity with mammalian and yeast JMJD2 proteins that are H3K9 and H3K36 demethylases. However, several specific features were observed in the structure of c-JMJ703. Key residues that interact with cofactors Fe(II) and N-oxalylglycine and the methylated H3K4 substrate peptide were identified and were shown to be essential for the demethylase activity in vivo. Several key residues are specifically conserved in known H3K4 demethylases, suggesting that they may be involved in the specificity for H3K4 demethylation.

PubMed: 23357881
DOI: 10.1371/journal.pgen.1003239

Experimental method

X-RAY DIFFRACTION (2.35 Å)