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. 1997 Aug 15;16(16):5098–5112. doi: 10.1093/emboj/16.16.5098

Interaction of DNA-dependent protein kinase with DNA and with Ku: biochemical and atomic-force microscopy studies.

M Yaneva 1, T Kowalewski 1, M R Lieber 1
PMCID: PMC1170144  PMID: 9305651

Abstract

DNA-dependent protein kinase (DNA-PK or the scid factor) and Ku are critical for DNA end-joining in V(D)J recombination and in general non-homologous double-strand break repair. One model for the function of DNA-PK is that it forms a complex with Ku70/86, and this complex then binds to DNA ends, with Ku serving as the DNA-binding subunit. We find that DNA-PK can itself bind to linear DNA fragments ranging in size from 18 to 841 bp double-stranded (ds) DNA, as indicated by: (i) mobility shifts; (ii) crosslinking between the DNA and DNA-PK; and (iii) atomic-force microscopy. Binding of the 18 bp ds DNA to DNA-PK activates it for phosphorylation of protein targets, and this level of activation is not increased by addition of purified Ku70/86. Ku can stimulate DNA-PK activity beyond this level only when the DNA fragments are long enough for the independent binding to the DNA of both DNA-PK and Ku. Atomic-force microscopy indicates that under such conditions, the DNA-PK binds at the DNA termini, and Ku70/86 assumes a position along the ds DNA that is adjacent to the DNA-PK.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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