Jay Ponder Lab

Welcome to the Home Page for the Jay Ponder Lab in the Department of Chemistry at Washington University in Saint Louis, Missouri. We are located in the Louderman Chemistry building on the Danforth campus.

Our group is primarily interested in computational chemistry, especially the development of new models and algorithms, and their application to problems in structural biology and organic chemistry. We develop, maintain and distribute several software packages which are described below. Publications and doctoral dissertations from the lab are available from Jay Ponder's Home Page.

• TINKER: A complete package for molecular mechanics, dynamics and modeling of molecules, especially biomacromolecules. Tinker has the ability to use any of several common parameter sets, such as Amber (ff94, ff96, ff98, ff99), CHARMM (19, 22 and 22-CMAP), Allinger MM (MM2-1991 and MM3-2000), OPLS (OPLS-UA, OPLS-AA and OPLS-AA/L), as well as our AMOEBA polarizable atomic multipole force field. Tinker implements a variety of novel algorithms including distance geometry with fast metrization and Gaussian trial distances, Elber's reaction path method, global optimization via our Potential Smoothing and Search algorithms, molecular dynamics with simulated annealing and stochastic dynamics options, particle mesh Ewald summation, Monte Carlo minimization, atomic multipole treatment of electrostatics with explicit dipole polarizability, Eisenberg-McLachlan ASP and GB/SA continuum solvation models, and truncated Newton TNCG local energy minimization.

• FORCE FIELD EXPLORER: A Java-based GUI for Tinker, which includes molecular visualization as well as the ability to launch Tinker calculations from a graphical interface. FFE uses a socket mechanism for communication between the GUI and Tinker programs, allowing local monitoring of jobs running on remote machines. The program can also download organics and drugs from PubChem and the NCI, and biopolymer structures from the PDB.

• SLEUTH: A small set of programs that allow creation of PDB file summaries and searching of a dataset extracted from the PDB for structural motifs. For example, SLEUTH can find all examples of type I turns that match some generalized sequence pattern. An additional program implements the Eisenberg 3D profile algorithm. The /data subdirectory contains a set of summary files with dihedral angle values, secondary structure and solvent exposure data by residue for many of the current PDB structures.

• PROPAK: A program to attack the "inverse" protein folding problem via modeling of the side chain packing in proteins. Allows the user to redesign a portion of a known structure using a library of side chain rotamers. Provides a list of the amino acid sequences that are predicted be compatable with an input tertiary fold. The PROPAK algorithm was one of the first attempts to attack this general protein design problem. The original program, although still useful, has not been under active development for some time and is largely superceded by methods from the labs of Steve Mayo, David Baker, and many others.

• QSAR: A program to derive QSAR models via regression analysis. The analysis can be performed by ordinary least squares (OLS), principal components (PCR) or partial least squares (PLS). "Leave-1-out" cross-validation is performed for all three types of analysis. For OLS and PCR, variable selection can be performed via simulated annealing on predictive power. In all cases, the final QSAR model can be used to make predictions for a test set distinct from the training set. Several training set data tables, including Garland Marshall's VALIDATE set for prediction of binding in macromolecular complexes, are provided as examples.

• CHEMISTRY 261: Organic Chemistry I

• CHEMISTRY 430: Simulation in Chemistry & Biochemistry

• CHEMISTRY 478: Molecular Modeling

• BIOLOGY 5325: Protein Structure & Function

• BIOLOGY 5357: Chemistry & Physics of Biomolecules

• BIOLOGY 5476: Modeling Biomolecular Systems I

• BIOLOGY 5477: Modeling Biomolecular Systems II

• Host-Guest Ligand Binding Systems (Jay Ponder, December 03) [PDF]

• Water Diffusion in NaCl/CsI Solutions (Zhi Wang, June 11) [PDF]

• Why the Sulfinyl Group is Special in DMSO (Chao Lu, June 04) [PDF]

• Strange Case of Enthalpy-Entropy Compensation (Jay Ponder, May 28) [PDF]

• Protein Structure from Correlated Mutations (Brooke Husic, May 16) [PDF]