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Molecular and Cellular Biology, January 2002, p. 69-77, Vol. 22, No. 1
0270-7306/01/$04.00+0     DOI: 10.1128/MCB.22.1.69-77.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Assembly of the RAG1/RAG2 Synaptic Complex

Cynthia L. Mundy, Nadja Patenge, Adam G. W. Matthews, and Marjorie A. Oettinger*

Department of Molecular Biology, Massachusetts General Hospital, and Department of Genetics, Harvard Medical School, Boston, Massachusetts 02114

Received 26 June 2001/ Returned for modification 3 August 2001/ Accepted 21 September 2001

Assembly of antigen receptor genes by V(D)J recombination requires the site-specific recognition of two distinct DNA elements differing in the length of the spacer DNA that separates two conserved recognition motifs. Under appropriate conditions, V(D)J cleavage by the purified RAG1/RAG2 recombinase is similarly restricted. Double-strand breakage occurs only when these proteins are bound to a pair of complementary signals in a synaptic complex. We examine here the binding of the RAG proteins to signal sequences and find that the full complement of proteins required for synapsis of two signals and coupled cleavage can assemble on a single signal. This complex, composed of a dimer of RAG2 and at least a trimer of RAG1, remains inactive for double-strand break formation until a second complementary signal is provided. Thus, binding of the second signal activates the complex, possibly by inducing a conformational change. If synaptic complexes are formed similarly in vivo, one signal of a recombining pair may be the preferred site for RAG1/RAG2 assembly.

* Corresponding author. Mailing address: Department of Molecular Biology, Wellman 10, Massachusetts General Hospital, Boston, MA 02114. Phone: (617) 726-5967. Fax: (617) 726-5949. E-mail: Oettinger{at}frodo.mgh.harvard.edu.

Molecular and Cellular Biology, January 2002, p. 69-77, Vol. 22, No. 1
0022-538X/01/$04.00+0     DOI: 10.1128/MCB.22.1.69-77.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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