Mechanism: How Polymerase Find Promoter Sequences

#Id: 7706

#Unit 1. Molecules and their Interaction Relevant to Biology

                                                                                                Type I β turn

#Id: 7707

#Unit 1. Molecules and their Interaction Relevant to Biology

H bonding i-i+3, i+1 in BS while i+2 in below LHH which virtually not allowed region

for most of amino acid except Gly that is why Gly is most conserved in type II B turns

                                                                Type II β turn

#Id: 7708

#Unit 1. Molecules and their Interaction Relevant to Biology

                  Type l'β turn

#Id: 7709

#Unit 1. Molecules and their Interaction Relevant to Biology

                              Type II β turn

#Id: 7710

#Unit 1. Molecules and their Interaction Relevant to Biology

#Id: 7711

#Unit 1. Molecules and their Interaction Relevant to Biology

                                                                 α-Turn

Contains hydrophilic amino acids and protrudes outside the protein surface like a hook.

Consists of 5 amino acids, generally termed as i, i+1, i+2, i+3 and i+4

H-bond is seen between i and i+4 (First and Fifth residue)

The conformation of i+1, i+2 and i+3 are crucial and on the basis of this, they are classified into

9 groups