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Molecular and Cellular Biology, November 2002, p. 7688-7700, Vol. 22, No. 21
0270-7306/02/$04.00+0     DOI: 10.1128/MCB.22.21.7688-7700.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Identification of a Family of Mastermind-Like Transcriptional Coactivators for Mammalian Notch Receptors

Lizi Wu,1,2 Tao Sun,2,3 Karla Kobayashi,1,2 Ping Gao,1,2 and James D. Griffin1,2*

Departments of Medical Oncology,1 Pediatric Oncology, Dana-Farber Cancer Institute,3 Departments of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts 021152

Received 27 March 2002/ Returned for modification 10 May 2002/ Accepted 31 July 2002

The molecular mechanisms by which Notch receptors induce diverse biological responses are not fully understood. We recently cloned a mammalian homologue of the Mastermind gene of Drosophila melanogaster, MAML1 (Mastermind-like-1 molecule) and determined that it functions as a transcriptional coactivator for Notch receptors. In this report, we characterize two additional genes in this Mastermind-like gene family: MAML2 and MAML3. The three MAML genes are widely expressed in adult tissues but exhibit distinct expression patterns in mouse early spinal cord development. All MAML proteins localize to nuclear bodies, share a conserved basic domain in their N termini that binds to the ankyrin repeat domain of Notch, and contain a transcriptional activation domain in their C termini. Moreover, as determined by using coimmunoprecipitation assays, each MAML protein was found to be capable of forming a multiprotein complex with the intracellular domain of each Notch receptor (ICN1 to -4) and CSL in vivo. However, MAML3 bound less efficiently to the ankyrin repeat domain of Notch1. Also, in U20S cells, whereas MAML1 and MAML2 functioned efficiently as coactivators with each of the Notch receptors to transactivate a Notch target HES1 promoter construct, MAML3 functioned more efficiently with ICN4 than with other forms of ICN. Similarly, MAML1 and MAML2 amplified Notch ligand (both Jagged2 and Delta1)-induced transcription of the HES-1 gene, whereas MAML3 displayed little effect. Thus, MAML proteins may modify Notch signaling in different cell types based on their own expression levels and differential activities and thereby contribute to the diversity of the biological effects resulting from Notch activation.

* Corresponding author. Mailing address: Dana-Farber Cancer Institute, 44 Binney St., Boston, MA 02115. Phone: (617) 632-3360. Fax: (617) 632-4388. E-mail: james_griffin{at}dfci.harvard.edu.

Molecular and Cellular Biology, November 2002, p. 7688-7700, Vol. 22, No. 21
0022-538X/02/$04.00+0     DOI: 10.1128/MCB.22.21.7688-7700.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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