Table of Contents: February 2009

The stability and gating motion of the voltage sensor domain (white) of the Kv1.2 ion channel in its natural environment within bilayers (orange) is a hot current research topic. Using extensive all-atom molecular dynamics simulations, a new study by Bjelkmar et al. sheds new light on these phenomena. Upon application of an electrical field, the voltage sensor S4 helix undergoes a secondary structure transition, orienting the positively charged arginine residues (yellow) in a way that seems to "prepare" them for the gating motion (see Bjelkmar et al., doi:10.1371/journal.pcbi.1000289).

Image Credit: Jyrki Hokkanen (The Finnish IT Center for Scientific Computing (CSC)).

Research Articles

Social Contact Networks and Disease Eradicability under Voluntary Vaccination

Ana Perisic, Chris T. Bauch

Predicting Peptide Structures in Native Proteins from Physical Simulations of Fragments

Vincent A. Voelz, M. Scott Shell, Ken A. Dill

Can Monkeys Choose Optimally When Faced with Noisy Stimuli and Unequal Rewards?

Samuel Feng, Philip Holmes, Alan Rorie, William T. Newsome

A Genome-Scale Metabolic Reconstruction of Mycoplasma genitalium, iPS189

Patrick F. Suthers, Madhukar S. Dasika, Vinay Satish Kumar, Gennady Denisov, John I. Glass, Costas D. Maranas

Statistical Dynamics of Flowing Red Blood Cells by Morphological Image Processing

John M. Higgins, David T. Eddington, Sangeeta N. Bhatia, L. Mahadevan

The Temporal Winner-Take-All Readout

Maoz Shamir

Conformational Changes and Slow Dynamics through Microsecond Polarized Atomistic Molecular Simulation of an Integral Kv1.2 Ion Channel

Pär Bjelkmar, Perttu S. Niemelä, Ilpo Vattulainen, Erik Lindahl

Accurate Path Integration in Continuous Attractor Network Models of Grid Cells

Yoram Burak, Ila R. Fiete

Allosteric Communication Occurs via Networks of Tertiary and Quaternary Motions in Proteins

Michael D. Daily, Jeffrey J. Gray

Agent-Based Model of Therapeutic Adipose-Derived Stromal Cell Trafficking during Ischemia Predicts Ability To Roll on P-Selectin

Alexander M. Bailey, Michael B. Lawrence, Hulan Shang, Adam J. Katz, Shayn M. Peirce

Rapid Sampling of Molecular Motions with Prior Information Constraints

Barak Raveh, Angela Enosh, Ora Schueler-Furman, Dan Halperin