The two replication forks meet and halt in a region approximately halfway around the chromosome from the origin.

TLS Online TPP Program

#Id: 1693

#Unit 4. Cell Communication and Cell Signaling

RAG1 is expressed at all phases of the cell cycle, RAG2 is stable only in G0- or G1-phase cells.

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#Id: 1694

#Unit 4. Cell Communication and Cell Signaling

Threonine residue T490 on RAG2 is phosphorylated during the S, G2, and M phases of the cell cycle, and this phosphorylation triggers the destruction of RAG2.

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#Id: 1695

#Unit 4. Cell Communication and Cell Signaling

RAG1 is the predominant recombinase; it forms a complex with the RSS that is stabilized by the binding of RAG2.

RAG2 by itself does not exhibit detectable RSS binding activity

TLS Online TPP Program

#Id: 1696

#Unit 4. Cell Communication and Cell Signaling

RAG1 subunit and contains two aspartic acid residues and one glutamic acid residue (D600, D708, and E962, respectively). This active site “DDE motif” is found in many enzymes that cleave DNA

TLS Online TPP Program

#Id: 1697

#Unit 4. Cell Communication and Cell Signaling

ZnA and ZnB on RAG1 are regions of the proteins that form zinc fingers, elongated protein domains stabilized by the coordination of a Zn ion.

TLS Online TPP Program

#Id: 1698

#Unit 4. Cell Communication and Cell Signaling

The ZnA region of the protein assists in the initial RAG1 binding to active chromatin via its ability to interact with histone H3.