An engineered yeaststrain was created by replacing genomic histones with mutants using an optimized yeast genetic code expansion (GCE) system. It can survive with co-translationally modified nucleosomes at the H3K56 position, providing insight into the functional differences in lysine acylation states, which might otherwise be difficult to study. Phenotypic variation between lysine acetylation and
Site-Specific Incorporation of ε-N-Crotonyllysine into Histones
作者:Chan Hyuk Kim、Mingchao Kang、Hak Joong Kim、Abhishek Chatterjee、Peter G. Schultz
DOI:10.1002/anie.201203349
日期:2012.7.16
A novel post-translationally modified amino acid, crotonyllysine (Kcr), was genetically incorporated into proteins in bacterial and mammalian cells using an evolved pyrrolysyl-tRNA/synthetase-tRNA pair. The ability to produce histones with homogenous, site-specific Kcr modifications will be valuable in elucidating the biological role of this recently identified post-translational modification.
[EN] METHODS AND KITS FOR DETERMINING DEACYLASE ACTIVITY<br/>[FR] PROCÉDÉS ET KITS DE DÉTERMINATION D'UNE ACTIVITÉ DE DÉSACYLASE
申请人:THE NAT INST FOR BIOTECHNOLOGY IN THE NEGEV LTD
公开号:WO2017064718A1
公开(公告)日:2017-04-20
Methods and kits for determining deacylase activity on an acylated lysine residue of a target polypeptide are disclosed. The methods disclosed comprise: providing one or more bacterial cells comprising: (i) an orthogonal pair of tRNA synthetase and tRNA; and/or (ii) a polynucleotide sequence encoding a target polypeptide, wherein said polynucleotide sequence comprises at least one codon that is specifically recognized by said tRNA; and (iii) at least one mammalian deacetylase; incubating said bacterial cell or extract thereof in the presence of Nɛ-acetyl lysine, wherein said tRNA is aminoacylated with Nɛ-modified lysine and incorporates the Nɛ-modified lysine into said target polypeptide, thereby expressing said target polypeptide comprising an Nɛ-modified lysine residue; determining the acylation levels of said target polypeptide; and comparing said acylation levels to a control; thereby determining deacylase activity.
Synthesis of ε-N-propionyl-, ε-N-butyryl-, and ε-N-crotonyl-lysine containing histone H3 using the pyrrolysine system
作者:Michael J. Gattner、Milan Vrabel、Thomas Carell
DOI:10.1039/c2cc37836a
日期:——
Recently new lysine modifications were detected in histones and other proteins. Using the pyrrolysine amber suppression system we genetically inserted three of the new amino acids ε-N-propionyl-, ε-N-butyryl-, and ε-N-crotonyl-lysine site specifically into histone H3. The lysine at position 9 (H3 K9), which is known to be highly modified in chromatin, was replaced by these unnatural amino acids.