SCAN0007 - Some observed DNA Tertiary Structures 1...

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Unformatted text preview: Some observed DNA Tertiary Structures 1. Cruciform structure — requires inverted repeat sequence or ‘palindrome’ sequence, and an unwinding torsional stress. e. g. 5’TACCGATYYYYATCGGTA3’ ATGGCTAXXXXTAGCCATS ’ Avg Loops - 4-5 nt. Sequence of stem & loop effects probability. Influences and influenced by DNA ‘supercoiling’ 2. Curved or kinked DNA repeated d(A)n- d(T)n tracks, n = 3- 6 if spaced 10—11 hp cause DNA curvature. B’/B junction Observed: Upstream region of strong bacterial promoters Minichromosornes of protozoa ...
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