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Title: From deep TLS validation to ensembles of atomic models built from elemental motions

The translation–libration–screw model first introduced by Cruickshank, Schomaker and Trueblood describes the concerted motions of atomic groups. Using TLS models can improve the agreement between calculated and experimental diffraction data. Because the T, L and S matrices describe a combination of atomic vibrations and librations, TLS models can also potentially shed light on molecular mechanisms involving correlated motions. However, this use of TLS models in mechanistic studies is hampered by the difficulties in translating the results of refinement into molecular movement or a structural ensemble. To convert the matrices into a constituent molecular movement, the matrix elements must satisfy several conditions. Refining the T, L and S matrix elements as independent parameters without taking these conditions into account may result in matrices that do not represent concerted molecular movements. Here, a mathematical framework and the computational tools to analyze TLS matrices, resulting in either explicit decomposition into descriptions of the underlying motions or a report of broken conditions, are described. The description of valid underlying motions can then be output as a structural ensemble. All methods are implemented as part of the PHENIX project.
 [1] ;  [2] ;  [3] ;  [3] ;  [4]
  1. CNRS–INSERM–UdS, Illkirch (France). Centre for Integrative Biology; Universite´ de Lorraine, Nancy (France). Faculte des Sciences et Technolgoies.
  2. Lawrence Berkeley National Lab., Berkeley, CA (United States). Physical Biosciences Div.
  3. Univ. of California, San Francisco, CA (United States). Dept. of Bioengineering and Therapeutic Sciences.
  4. Lawrence Berkeley National Lab., Berkeley, CA (United States). Physical Biosciences Div.; Univ. of California, Berkeley, CA (United States). Dept. of Bioengineering.
Publication Date:
OSTI Identifier:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Acta Crystallographica. Section D: Biological Crystallography (Online)
Additional Journal Information:
Journal Name: Acta Crystallographica. Section D: Biological Crystallography (Online); Journal Volume: 71; Journal Issue: 8; Journal ID: ISSN 1399-0047
International Union of Crystallography
Research Org:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Org:
Country of Publication:
United States
TLS model; TLS matrices; model validation; molecular mobility; ensemble of models; diffuse scattering; libration; vibration; correlated motion