Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Warning: imagejpeg(C:\Inetpub\vhosts\kidney.de\httpdocs\phplern\25917549
.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Genes+Dev
2015 ; 29
(9
): 961-74
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Structural mechanisms of DREAM complex assembly and regulation
#MMPMID25917549
Guiley KZ
; Liban TJ
; Felthousen JG
; Ramanan P
; Litovchick L
; Rubin SM
Genes Dev
2015[May]; 29
(9
): 961-74
PMID25917549
show ga
The DREAM complex represses cell cycle genes during quiescence through
scaffolding MuvB proteins with E2F4/5 and the Rb tumor suppressor paralog p107 or
p130. Upon cell cycle entry, MuvB dissociates from p107/p130 and recruits B-Myb
and FoxM1 for up-regulating mitotic gene expression. To understand the
biochemical mechanisms underpinning DREAM function and regulation, we
investigated the structural basis for DREAM assembly. We identified a sequence in
the MuvB component LIN52 that binds directly to the pocket domains of p107 and
p130 when phosphorylated on the DYRK1A kinase site S28. A crystal structure of
the LIN52-p107 complex reveals that LIN52 uses a suboptimal LxSxExL sequence
together with the phosphate at nearby S28 to bind the LxCxE cleft of the pocket
domain with high affinity. The structure explains the specificity for p107/p130
over Rb in the DREAM complex and how the complex is disrupted by viral
oncoproteins. Based on insights from the structure, we addressed how DREAM is
disassembled upon cell cycle entry. We found that p130 and B-Myb can both bind
the core MuvB complex simultaneously but that cyclin-dependent kinase
phosphorylation of p130 weakens its association. Together, our data inform a
novel target interface for studying MuvB and p130 function and the design of
inhibitors that prevent tumor escape in quiescence.