Watson and Crick Model Characteristic Forms of DNA

Characteristic Forms of DNA A B C Z Condition required to produce 75%H

Characteristic Forms of DNA A B C Z Condition required to 75%H 2

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Watson and Crick Model

Characteristic Forms of DNA A B C Z Condition required to produce 75%H 2 O 92%H 2 O - 66% Overall shape Short & broad Long &thinner - Elongated& slim Helix direction Right handed Right-handed Left handed Helix diameter 26 A 0 20 A 0 19 A 0 18 A 0 Bases/3600 turn 11. 0 10. 0 9. 3 12. 0 Repeating unit 1 bp 1 bp Rotation/bp 34. 70 340 Mean bp/turn 10. 7 10. 0 12 +190 -1. 20 -90 Rise/bp along axis/ 2. 56 A 0 3. 38 A 0 Pitch/turn of helix 24. 6 A 0 33. 2 A 0 45. 6 A 0 Mean propeller twist +180 +160 0° Glycosyl angle Anti anti Sugar pucker C 3'-endo C 2'-endo Inclination of bp to axis 2 bp 38. 6 3. 32 A 0 anti -300 5. 71 A 0 C: anti, G: syn C: C 2'-endo, G: C 2'exo

Characteristic Forms of DNA A B C Z Condition required to 75%H 2 O produce 92%H 2 O - 66% Overall shape Short & broad Long &thiner - Elongated& slim Helix direction Right handed Right-handed Left handed Helix diameter 26Å 20Å 19 A 18Å Bases/3600 turn 11. 0 10. 0 9. 3 12. 0 Repeating unit 1 bp 1 bp Rotation/bp 34. 7° 34° Mean bp/turn 10. 7 10. 0 12 Inclination of bp to axis +19° -1. 2° -9° Rise/bp along axis/ 2. 56Å 3. 38Å Pitch/turn of helix 24. 6Å 33. 2Å 45. 6Å Mean propeller twist +18° +16° 0° Glycosyl angle anti Sugar pucker C 3'-endo C 2'-endo 2 bp 38. 6 3. 32 Å anti -30° 5. 71Å C: anti, G: syn C: C 2'-endo, G: C 2'exo