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2015 ; 10
(10
): e0139699
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Cancer-Related NEET Proteins Transfer 2Fe-2S Clusters to Anamorsin, a Protein
Required for Cytosolic Iron-Sulfur Cluster Biogenesis
#MMPMID26448442
Lipper CH
; Paddock ML
; Onuchic JN
; Mittler R
; Nechushtai R
; Jennings PA
PLoS One
2015[]; 10
(10
): e0139699
PMID26448442
show ga
Iron-sulfur cluster biogenesis is executed by distinct protein assembly systems.
Mammals have two systems, the mitochondrial Fe-S cluster assembly system (ISC)
and the cytosolic assembly system (CIA), that are connected by an unknown
mechanism. The human members of the NEET family of 2Fe-2S proteins,
nutrient-deprivation autophagy factor-1 (NAF-1) and mitoNEET (mNT), are located
at the interface between the mitochondria and the cytosol. These proteins have
been implicated in cancer cell proliferation, and they can transfer their 2Fe-2S
clusters to a standard apo-acceptor protein. Here we report the first
physiological 2Fe-2S cluster acceptor for both NEET proteins as human Anamorsin
(also known as cytokine induced apoptosis inhibitor-1; CIAPIN-1). Anamorsin is an
electron transfer protein containing two iron-sulfur cluster-binding sites that
is required for cytosolic Fe-S cluster assembly. We show, using UV-Vis
spectroscopy, that both NAF-1 and mNT can transfer their 2Fe-2S clusters to
apo-Anamorsin with second order rate constants similar to those of other known
human 2Fe-2S transfer proteins. A direct protein-protein interaction of the NEET
proteins with apo-Anamorsin was detected using biolayer interferometry.
Furthermore, electrospray mass spectrometry of holo-Anamorsin prepared by cluster
transfer shows that it receives both of its 2Fe-2S clusters from the NEETs. We
propose that mNT and NAF-1 can provide parallel routes connecting the
mitochondrial ISC system and the CIA. 2Fe-2S clusters assembled in the
mitochondria are received by NEET proteins and when needed transferred to
Anamorsin, activating the CIA.
|Apoproteins/chemistry/metabolism
[MESH]
|Binding Sites
[MESH]
|Dimerization
[MESH]
|Electron Transport
[MESH]
|Humans
[MESH]
|Interferometry
[MESH]
|Intracellular Signaling Peptides and Proteins/chemistry/*metabolism
[MESH]