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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
2013 ; 288
(23
): 16680-16689
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IOP1 protein is an external component of the human cytosolic iron-sulfur cluster
assembly (CIA) machinery and functions in the MMS19 protein-dependent CIA
pathway
#MMPMID23585563
Seki M
; Takeda Y
; Iwai K
; Tanaka K
J Biol Chem
2013[Jun]; 288
(23
): 16680-16689
PMID23585563
show ga
The emerging link between iron metabolism and genome integrity is increasingly
clear. Recent studies have revealed that MMS19 and cytosolic iron-sulfur cluster
assembly (CIA) factors form a complex and have central roles in CIA pathway.
However, the composition of the CIA complex, particularly the involvement of the
Fe-S protein IOP1, is still unclear. The roles of each component are also largely
unknown. Here, we show that MMS19, MIP18, and CIAO1 form a tight "core" complex
and that IOP1 is an "external" component of this complex. Although IOP1 and the
core complex form a complex both in vivo and in vitro, IOP1 behaves differently
in vivo. A deficiency in any core component leads to down-regulation of all of
the components. In contrast, IOP1 knockdown does not affect the level of any core
component. In MMS19-overproducing cells, other core components are also
up-regulated, but the protein level of IOP1 remains unchanged. IOP1 behaves like
a target protein in the CIA reaction, like other Fe-S helicases, and the core
complex may participate in the maturation process of IOP1. Alternatively, the
core complex may catch and hold IOP1 when it becomes mature to prevent its
degradation. In any case, IOP1 functions in the MMS19-dependent CIA pathway. We
also reveal that MMS19 interacts with target proteins. MIP18 has a role to bridge
MMS19 and CIAO1. CIAO1 also binds IOP1. Based on our in vivo and in vitro data,
new models of the CIA machinery are proposed.