TY - JOUR
T1 - Mitosin/CENP-F as a negative regulator of activating transcription factor-4
AU - Zhou, Xubin
AU - Wang, Rong
AU - Fan, Libin
AU - Li, Yan
AU - Ma, Li
AU - Yang, Zhenye
AU - Yu, Wei
AU - Jing, Naihe
AU - Zhu, Xueliang
PY - 2005/4/8
Y1 - 2005/4/8
N2 - Mitosin/CENP-F is a human nuclear matrix protein with multiple leucine zipper motifs. Its accumulation in S-G2 phases and transient kinetochore localization in mitosis suggest a multifunctional protein for cell proliferation. Moreover, its murine and avian orthologs are implicated in myocyte differentiation. Here we report its interaction with activating transcription factor-4 (ATF4), a ubiquitous basic leucine zipper transcription factor important for proliferation, differentiation, and stress response. The C-terminal portion of mitosin between residues 2488 and 3113 bound to ATF4 through two distinct domains, one of which was a leucine zipper motif. Mitosin mutants containing these domains were able to either supershift or disrupt the ATF4-DNA complex. On the other hand, ATF4, but not ATF1-3 or ATF6, interacted with mitosin through a region containing the basic leucine zipper motif. Moreover, overexpression of full-length mitosin repressed the transactivation activity of ATF4 in dual luciferase-based reporter assays, while knocking down mitosin expression manifested the opposite effects. These findings suggest mitosin to be a negative regulator of ATF4 in interphase through direct interaction.
AB - Mitosin/CENP-F is a human nuclear matrix protein with multiple leucine zipper motifs. Its accumulation in S-G2 phases and transient kinetochore localization in mitosis suggest a multifunctional protein for cell proliferation. Moreover, its murine and avian orthologs are implicated in myocyte differentiation. Here we report its interaction with activating transcription factor-4 (ATF4), a ubiquitous basic leucine zipper transcription factor important for proliferation, differentiation, and stress response. The C-terminal portion of mitosin between residues 2488 and 3113 bound to ATF4 through two distinct domains, one of which was a leucine zipper motif. Mitosin mutants containing these domains were able to either supershift or disrupt the ATF4-DNA complex. On the other hand, ATF4, but not ATF1-3 or ATF6, interacted with mitosin through a region containing the basic leucine zipper motif. Moreover, overexpression of full-length mitosin repressed the transactivation activity of ATF4 in dual luciferase-based reporter assays, while knocking down mitosin expression manifested the opposite effects. These findings suggest mitosin to be a negative regulator of ATF4 in interphase through direct interaction.
UR - http://www.scopus.com/inward/record.url?scp=17144390551&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=17144390551&partnerID=8YFLogxK
U2 - 10.1074/jbc.M414310200
DO - 10.1074/jbc.M414310200
M3 - Article
C2 - 15677469
AN - SCOPUS:17144390551
SN - 0021-9258
VL - 280
SP - 13973
EP - 13977
JO - Journal of Biological Chemistry
JF - Journal of Biological Chemistry
IS - 14
ER -