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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Biol+Chem
2016 ; 291
(40
): 21283-21295
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Structure/Function Analysis of Recurrent Mutations in SETD2 Protein Reveals a
Critical and Conserved Role for a SET Domain Residue in Maintaining Protein
Stability and Histone H3 Lys-36 Trimethylation
#MMPMID27528607
Hacker KE
; Fahey CC
; Shinsky SA
; Chiang YJ
; DiFiore JV
; Jha DK
; Vo AH
; Shavit JA
; Davis IJ
; Strahl BD
; Rathmell WK
J Biol Chem
2016[Sep]; 291
(40
): 21283-21295
PMID27528607
show ga
The yeast Set2 histone methyltransferase is a critical enzyme that plays a number
of key roles in gene transcription and DNA repair. Recently, the human homologue,
SETD2, was found to be recurrently mutated in a significant percentage of renal
cell carcinomas, raising the possibility that the activity of SETD2 is
tumor-suppressive. Using budding yeast and human cell line model systems, we
examined the functional significance of two evolutionarily conserved residues in
SETD2 that are recurrently mutated in human cancers. Whereas one of these
mutations (R2510H), located in the Set2 Rpb1 interaction domain, did not result
in an observable defect in SETD2 enzymatic function, a second mutation in the
catalytic domain of this enzyme (R1625C) resulted in a complete loss of histone
H3 Lys-36 trimethylation (H3K36me3). This mutant showed unchanged thermal
stability as compared with the wild type protein but diminished binding to the
histone H3 tail. Surprisingly, mutation of the conserved residue in Set2 (R195C)
similarly resulted in a complete loss of H3K36me3 but did not affect dimethylated
histone H3 Lys-36 (H3K36me2) or functions associated with H3K36me2 in yeast.
Collectively, these data imply a critical role for Arg-1625 in maintaining the
protein interaction with H3 and specific H3K36me3 function of this enzyme, which
is conserved from yeast to humans. They also may provide a refined biochemical
explanation for how H3K36me3 loss leads to genomic instability and cancer.