نتایج جستجو برای: secondary structures

تعداد نتایج: 742016  

Journal: :Advances in Complex Systems 2005
Camille Stephan-Otto Attolini Peter F. Stadler

RNA molecules interact by forming inter-molecular base pairs that compete with the intramolecular base pairs of their secondary structures. Here we investigate the patterns of neutral mutations in RNAs whose function is the interaction with other RNAs, i.e., of co-folding RNAs. We find that (1) the degree of neutrality is much smaller in interacting RNAs compared to RNAs that just have to cofor...

Journal: :Computers in biology and medicine 2006
Elias Zintzaras N. P. Brown Axel Kowald

Proteins were classified into their families using a classification tree method which is based on the coefficient of variations of physico-chemical and geometrical properties of the secondary structures of proteins. The tree method uses as splitting criterion the increase in purity when a node is split into two subnodes and the size of the tree is controlled by a threshold level for the improve...

Journal: :Proceedings. IEEE Computer Society Bioinformatics Conference 2003
Matthias Höchsmann Thomas Töller Robert Giegerich Stefan Kurtz

We present a systematic treatment of alignment distance and local similarity algorithms on trees and forests. We build upon the tree alignment algorithm for ordered trees given by Jiang et. al (1995) and extend it to calculate local forest alignments, which is essential for finding local similar regions in RNA secondary structures. The time complexity of our algorithm is O(|F(1)| |F(2) deg(F(1)...

Journal: :Journal of computational biology : a journal of computational molecular cell biology 2006
P. Clote

Following Zuker (1986), a saturated secondary structure for a given RNA sequence is a secondary structure such that no base pair can be added without violating the definition of secondary structure, e.g., without introducing a pseudoknot. In the Nussinov-Jacobson energy model (Nussinov and Jacobson, 1980), where the energy of a secondary structure is -1 times the number of base pairs, saturated...

Journal: :RNA 2008
Peter J Shepard Klemens J Hertel

Pre-mRNA splicing is carried out by the spliceosome, which identifies exons and removes intervening introns. Alternative splicing in higher eukaryotes results in the generation of multiple protein isoforms from gene transcripts. The extensive alternative splicing observed implies a flexibility of the spliceosome to identify exons within a given pre-mRNA. To reach this flexibility, splice-site s...

Journal: :Bioinformatics 2011
Yuan Li Shaojie Zhang

MOTIVATION Many RNAs, such as riboswitches, can fold into multiple alternate structures and perform different biological functions. These biologically functional structures usually have low free energies in their local energy landscapes and are very stable such that they cannot easily jump out of the current states and fold into other stable conformations. The conformational space of feasible R...

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