From Unfolded Sequences To Structural Motives

NIEL B.I.; REARTES W.A.; BRIGNOLE N. B.

Rosario

Congreso; ENIEF 2011: 19º Congreso sobre Métodos Numéricos y sus Aplicaciones; 2011

AMCA

We consider that the biopolymer chain forms intramolecular contacts at the expense of losing conformational freedom. By means of a cohesive arithmetic method we have analysed the feasible base pairing contact patterns in nucleotide subsequences from untangled to knotted biopolymer chains. The procedure associates complementary integers to each of the two base pairings of the monomers that integrate the homologous sequences, (e.g. G 2 c + 1 and C, A 2 c + 2 and T(U) 2 c − 1; nt number of units). Given nt and the quantities of each of the monomers in the biopolymer, the unfolded sequence is obtained by searching for the admissible Hamiltonian paths of order nt − 1 under the penalisation of any zipping and/or stacking of base pairing processes. Finally, by comparing backward and forward readings in the obtained unfolded sequences we could individualize certain structural features of biological interest which are deployed in scientific papers about nucleic acids [1,2]