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Nucleic Acids Research, 1994, Vol. 22, No. 10 1810-1814
© 1994

MOLECULAR BIOLOGY

Analysis of regions of RAG-2 important for V(D)J recombination

Christina A. Cuomo and Marjorie A. Oettinger*,

Department of Molecular Biology, Massachusetts General Hospital Boston, MA 02114 Department of Genetics, Harvard Medical School Boston, MA 02115, USA

*To whom correspondence should be addressed at: Department of Molecular Biology, Massachusetts General Hospital, Boston, MA 02114, USA

Received March 3, 1994. Accepted April 7, 1994.

The recombinase activating genes RAG-1 and RAG-2 operate together to activate V(D)J recombination, and thus play an essential role in the generation of immune system diversity. As a first step in understanding the function of the RAG-2 protein, we have tested a series of deletion and insertion mutations for their ability to induce V(D)J joining of a variety of model substrates. Mutants were assayed for their ability to induce deletional and inversional V(D)J joining, thereby testing their proficiency at forming both signal and coding joints, and, in some cases, for their ability to carry out recombination of both extrachromosomal and integrated recombination substrates. All these reactions were affected similarly by any one mutation. Although the RAG-2 protein shows extensive evolutionary conservation across its length, we found that the carboxy-terminal portion of RAG-2, including an acidic region, is dispensable for all forms of recombination tested. In contrast, all mutations we created in the N-terminal region severely decreased recombination. Thus, the core active region required for V(D)J recombination is confined to the first three-quarters of the RAG-2 protein.


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