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addenda and errata
| BIOLOGICAL CRYSTALLOGRAPHY |
Escherichia coli MltA: and of a tetartohedrally twinned protein Addendum and erratum
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.]](../../../../../../logos/arrows/d_arr.gif "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)}]](teximages/wd5040fd1.gif)
![[\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 \ }]](teximages/wd5040fd2.gif)
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}. }]](teximages/wd5040fd3.gif)
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) which is given in full in the reference list below.
References
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. CrossRef CAS IUCr Journals Google Scholar
van 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
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