A helical arch allowing single-stranded DNA to thread through T5 5'-exonuclease.
Ceska, T.A., Sayers, J.R., Stier, G., Suck, D.(1996) Nature 382: 90-93
- PubMed: 8657312 
- DOI: 10.1038/382090a0
- Primary Citation of Related Structures:  
1EXN - PubMed Abstract: 
THE 5'-exonucleases are enzymes that are essential for DNA replication and repair. As well as their exonucleolytic action, removing nucleotides from the 5'-end of nucleic acid molecules such as Okazaki fragments, many 5'-3'-exonucleases have been shown to possess endonucleolytic activities ...