TLS Motion Determination Home

TLS Motion Determination (TLSMD) analyzes a macromolecular crystal structure for evidence of flexibility, e.g. local or inter-domain motions. It does this by partitioning individual chains into multiple segments that are modeled as rigid bodies undergoing TLS (Translation/Libration/Screw) vibrational motion. It generates all possible partitions up to a maximum number of segments. Each trial partition is scored by how well it explains the observed atomic displacement parameters ("B values") that came out of crystallographic refinement.
13TR Animation
Backbone displacement of HIV Protease + inhibitor (1T3R). Both A and B chains of the homodimer are partitioned into 5 TLS groups by TLSMD. Click here to view an animated GIF, or here for an interactive Jmol animation of chain A. The complete analysis is here.

Submit your structure using the Start a New Job page. TLSMD is computationally expensive, so jobs are handled by a run queue. You can monitor the progress of your run on the Job Status page. The server will notify you by Email when the job has finished.
The server returns:

More information about TLS groups, interpretation of the TLS parameters, and interactive visualization of TLS models can be found in the reprints below, and in the TLSView Manual. TLSView is part of the Python Macromolecular Library (mmLib).

Note: TLSMD is a work in progress. Expect it to change. Please let us know of any problems, suggestions, or blinding revelations inspired by the analysis. If you use TLSMD results to refine or analyze your structure, please cite the papers below.

Please cite: Contact us:
      TLSMD: J Painter & E A Merritt (2006) Acta Cryst. D62, 439-450 reprint: (PDF)        Ethan Merritt <merritt _at_>
      server: J Painter & E A Merritt (2006) J. Appl. Cryst. 39, 109-111 reprint: (PDF)

Last Modified 13 June 2012