Related Experiment Video
Updated: Jul 20, 2026

Production of Nurr-1 Specific Polyclonal Antibodies Free of Cross-reactivity Against Its Close Homologs, Nor1 and Nur77
Published on: August 17, 2015
Neuronal PAS domain protein 1 is a transcriptional repressor and requires arylhydrocarbon nuclear translocator for
Christina H L Teh1, Kevin K Y Lam, Chin C Loh
1Department of Biological Sciences, National University of Singapore, 14 Science Drive 4, Kent Ridge, Singapore 117542.
Abstract:
Neuronal PAS domain protein 1 (NPAS1), a basic helix-loop-helix-PAS transcription factor expressed in the central nervous system, has been suggested to be involved in neuronal differentiation. However, relatively little is known about the molecular mechanism underlying the role of NPAS1 during development. In this study we set out to characterize the different domains within NPAS1. We showed that the nuclear localization of NPAS1 is dependent on the presence of ARNT. In addition, the transcriptional potential of ARNT is not required for this localization. In the absence of ARNT, NPAS1 is excluded from the nucleus, and this exclusion is due to the presence of a nuclear export signal within the N terminus of NPAS1. The interaction between NPAS1 and ARNT is via their N termini. We found no transactivation domain within NPAS1; instead, we mapped out at least three repression domains within NPAS1, suggesting that NPAS1 acts as a repressor. Furthermore, our experiments showed that NPAS1 is able to repress the transactivation functions of ARNT and ARNT2. We suggest that NPAS1 is guided into the nucleus by ARNT via the ARNT nuclear localization signal, and NPAS1 can override the activation function of adjacent transcription factors, providing a mechanism by which NPAS1 may inhibit transcription.
More Related Videos
10:03Isolation of CA1 Nuclear Enriched Fractions from Hippocampal Slices to Study Activity-dependent Nuclear Import of Synapto-nuclear Messenger Proteins
Published on: August 10, 2014
10:25Real-time Bioluminescence Imaging of Notch Signaling Dynamics during Murine Neurogenesis
Published on: December 12, 2019
Related Concept Videos
Regulation of Nuclear Protein Sorting
Transducer Mechanism: Nuclear Receptors
About 48 different soluble family members of nuclear receptors are identified that can be divided into two main classes:
Co-activators and Co-repressors
Co-activators and Co-repressors
Eukaryotic Transcription Inhibitors
Eukaryotic transcription inhibitors usually contain two distinct domains, a DNA...
RNA Polymerase II Accessory Proteins