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. 1994 Apr 26;91(9):3525–3529. doi: 10.1073/pnas.91.9.3525

Binding of histones H1 and H5 and their globular domains to four-way junction DNA.

P Varga-Weisz 1, J Zlatanova 1, S H Leuba 1, G P Schroth 1, K van Holde 1
PMCID: PMC43612  PMID: 8170940

Abstract

We have compared chicken erythrocyte linker histones H1 and H5 binding to a synthetic four-way DNA junction. Each histone binds to form a single complex, with an affinity which permits competition against a large excess of linear duplex DNA. The affinity of H5 is higher than that of H1. The globular domain from either protein will also bind strongly, but in this case multiple binding occurs. Binding of intact H1 is inhibited by cations: Mg2+ and spermidine are very effective, Na+ much less so. This inhibition is not likely to be a general ion-competition effect, for Mg2+ is much less effective in inhibiting the binding of H1 to linear DNA. Instead, the inhibition of binding may be due to ion-dependent changes in the conformation of the four-way junction, which are known to occur under similar conditions. These results strongly suggest that the angle formed between the arms of the DNA junction could be a major determinant in the interaction of H1 with DNA crossovers.

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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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