NDLI: Preferential Inhibition of BMAL2-CLOCK Activity by PER2 Reemphasizes Its Negative Role and a Positive Role of BMAL2 in the Circadian Transcription*

Content Provider	PubMed Central
Author	Sasaki, Momoko Yoshitane, Hikari Du, Ngoc-hien Okano, Toshiyuki Fukada, Yoshitaka
Abstract	In the molecular oscillatory mechanism governing circadian rhythms, positive regulators, including CLOCK and BMAL1, transactivate Per and Cry genes through E-box elements, and translated PER and CRY proteins negatively regulate their own transactivation. Like BMAL1, its paralog BMAL2 dimerizes with CLOCK to activate the E-box-dependent transcription, but the role of BMAL2 in the circadian clockwork is still elusive. Here we characterized BMAL2 function in NIH3T3 cells and found that the cellular rhythms monitored by Bmal1 promoter-driven bioluminescence signals were blunted by RNA interference-mediated suppression of Bmal2 as well as that of Bmal1. Transcription assays with a 2.1-kb mPer1 promoter revealed that CRY2 inhibited the transactivation mediated by BMAL1-CLOCK more strongly than that by BMAL2-CLOCK. In contrast, PER2 showed a stronger inhibitory effect on BMAL2-CLOCK than on BMAL1-CLOCK. The molecular link between BMAL2 and PER2 was further strengthened by the fact that PER2 exhibited a greater affinity for BMAL2 than for BMAL1 in co-immunoprecipitation experiments. These results indicate a functional partnership between BMAL2 and PER2 and reemphasize the negative role of PER2 in the circadian transcription. As a broad spectrum function, BMAL2-CLOCK activated transcription from a variety of SV40-driven reporters harboring various E/E′-box-containing sequences present in the upstream regions of clock and clock-controlled genes. Importantly, the efficiencies of BMAL2-CLOCK-mediated transactivation relative to that achieved by BMAL1-CLOCK were dependent heavily on the E-box-containing sequences, supporting distinguishable roles of the two BMALs. Collectively, it is strongly suggested that BMAL2 plays an active role in the circadian transcription.
Related Links	http://dx.doi.org/10.1074/jbc.m109.040758
Ending Page	25159
Page Count	11
Starting Page	25149
File Format	PDF
ISSN	00219258
e-ISSN	1083351X
Journal	The Journal of Biological Chemistry
Issue Number	37
Volume Number	284
Language	English
Publisher	American Society for Biochemistry and Molecular Biology
Publisher Date	2009-09-11
Access Restriction	Open
Rights Holder	American Society for Biochemistry and Molecular Biology
Subject Keyword	Cell Biology Biochemistry Molecular Biology Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Cell Biology Biochemistry Molecular Biology

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Preferential Inhibition of BMAL2-CLOCK Activity by PER2 Reemphasizes Its Negative Role and a Positive Role of BMAL2 in the Circadian Transcription

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Preferential Inhibition of BMAL2-CLOCK Activity by PER2 Reemphasizes Its Negative Role and a Positive Role of BMAL2 in the Circadian Transcription*

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