addenda and errata\(\def\hfill{\hskip 5em}\def\hfil{\hskip 3em}\def\eqno#1{\hfil {#1}}\)

Journal logoBIOLOGICAL
CRYSTALLOGRAPHY
ISSN: 1399-0047

Escherichia coli MltA: MAD phasing and refinement of a tetartohedrally twinned protein crystal structure. Addendum and erratum

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aLaboratory of Biophysical Chemistry, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
*Correspondence e-mail: b.w.dijkstra@rug.nl

In the paper by Barends et al. [(2005), Acta Cryst. D61, 613–621] errors were published in equations (4) and (6). The correct versions of these equations are given in this article. Addenda to the caption for Fig. 2 and one of the references in the article are also given.

The correct versions of equations (4) and (6) from the paper by Barends et al. (2005[Barends, T. R. M., de Jong, R. M., van Straaten, K. E., Thunnissen, A.-M. W. H. & Dijkstra, B. W. (2005). Acta Cryst. D61, 613-621.]) are as follows,

[\eqalignno {R &= \biggr [\textstyle\sum\limits_{hkl} \big | | F_{\rm obs}| - k\big (\alpha | F_{\rm calc}|^2 + \alpha 'T'| F_{\rm calc}|^2 + \alpha ''T''|F_{\rm calc}|^2 \cr &\ \quad +\ \alpha '''T'''|F_{\rm calc}|^2\big)^{1/2}\big |\biggr ]\biggr/\textstyle \sum\limits_{hkl} |F_{\rm obs} |, & (4)}]

[\eqalignno{dt & = {{ - 2k} \over {\textstyle \sum\limits_{hkl} |F_{\rm obs}|^2}} \cdot\biggr\{ \left[(|F_{\rm obs}| - k| F_{\rm calc}^{\rm tetartohedral}|){{\alpha F_{\rm calc} } \over {| F_{\rm calc}^{\rm tetartohedral}|}} \right] \cr \cr &\ \quad +\ T'\left[(|F_{\rm obs}| - k|F_{\rm calc}^{\rm tetartohedral}|){{\alpha 'F_{\rm calc} } \over {|F_{\rm calc}^{\rm tetartohedral} |}}\right] \cr \cr &\ \quad +\ T''\left [(|F_{\rm obs}| - k|F_{\rm calc}^{\rm tetartohedral} |){{\alpha ''F_{\rm calc} } \over {|F_{\rm calc}^{\rm tetartohedral}|}} \right] \cr \cr &\ \quad +\ T'''\left[(| F_{\rm obs}| - k| F_{\rm calc}^{\rm tetartohedral} |){{\alpha '''F_{\rm calc} } \over {|F_{\rm calc}^{\rm tetartohedral}|}}\right] \biggr\} &(6)\cr \ }]

where

[\eqalign{| F_{\rm calc}^{\rm tetartohedral}| =\ & \big(\alpha |F_{\rm calc}|^2 + \alpha '| T'F_{\rm calc}|^2 + \alpha ''|T''F_{\rm calc}|^2 \cr & + \alpha '''| T'''F_{\rm calc}|^2\big)^{1/2}. }]

In Fig. 2(b) of the original paper, a cutoff of 3σ was used for reflections between 2.3 and 2.15 Å resolution because of the weak data at this high resolution. Also an addition is made to the reference for van Straaten et al. (2004[van Straaten, K. E., Dijkstra, B. W. & Thunnissen, A.-M. W. H. (2004). Acta Cryst. D60, 758-760.]) which is given in full in the reference list below.

Footnotes

Current address: Max-Planck Institute for Medical Research, Jahnstrasse 29, 69120 Heidelberg, Germany.

§Current address: Department of Chemistry, Columbia University, 3000 Broadway, MC 3153, New York, NY 10027, USA.

References

First citationBarends, T. R. M., de Jong, R. M., van Straaten, K. E., Thunnissen, A.-M. W. H. & Dijkstra, B. W. (2005). Acta Cryst. D61, 613–621.  CrossRef CAS IUCr Journals Google Scholar
First citationvan Straaten, K. E., Dijkstra, B. W. & Thunnissen, A.-M. W. H. (2004). Acta Cryst. D60, 758–760.  Web of Science CrossRef CAS IUCr Journals Google Scholar

© International Union of Crystallography. Prior permission is not required to reproduce short quotations, tables and figures from this article, provided the original authors and source are cited. For more information, click here.

Journal logoBIOLOGICAL
CRYSTALLOGRAPHY
ISSN: 1399-0047
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