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. 1979 Aug;139(2):486–494. doi: 10.1128/jb.139.2.486-494.1979

Localization of low-molecular-weight basic proteins in Bacillus megaterium spores by cross-linking with ultraviolet light.

B Setlow, P Setlow
PMCID: PMC216894  PMID: 110790

Abstract

Two low-molecular-weight basic proteins, termed A and B proteins, comprise about 15% of the protein of dormant spores of Bacillus megaterium. Irradiation of intact dormant spores with ultraviolet light results in covalent cross-linking of the A and B proteins to other spore macromolecules. The cross-linked A and B proteins are precipitated by ethanol and can be solubilized by treatment with deoxyribonuclease (75%) or ribonuclease (25%). Irradiation of complexes formed in vitro between deoxyribonucleic acid (DNA) or ribonucleic acid and a mixture of the low-molecular-weight basic proteins from spores also resulted in cross-linking of A and B proteins to nucleic acids. The dose-response curves for formation of covalent cross-links were similar for irradiation of both a protein-DNA complex in vitro and intact spores. However, if irradiation was carried out in vitro under conditions where DNA-protein complexes were disrupted, no covalent cross-links were formed. These data suggest that significant amounts of the low-molecular-weight basic proteins unique to bacterial spores are associated with spore DNA in vivo.

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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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