Nucleosome
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A nucleosome is the basic structural unit of DNA packaging in eukaryotes. The structure of a nucleosome consists of a segment of DNA wound around eight histone proteins and resembles thread wrapped around a spool. The nucleosome is the fundamental subunit of chromatin. Each nucleosome is composed of a little less than two turns of DNA wrapped around a set of eight proteins called histones, which are known as a histone octamer. Each histone octamer is composed of two copies each of the histone proteins H2A, H2B, H3, and H4.
Image: Nucleosome core particle 1EQZ v.3
Image: Nucleosome core particle 1EQZ v.4
Image: Nucleosome core particle 1EQZ v.5
Roger D. Kornberg
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Roger David Kornberg is an American biochemist and professor of structural biology at Stanford University School of Medicine. Kornberg was awarded the Nobel Prize in Chemistry in 2006 for his studies of the process by which genetic information from DNA is copied to RNA, "the molecular basis of eukaryotic transcription."
Image: Roger D Kornberg
Kornberg in 2006
Roger D. Kornberg (third from left) with Andrew Fire, George Smoot, Dick Cheney, Craig Mello and John C. Mather