Automated assignment in selectively methyl-labeled proteins.
Automated assignment in selectively methyl-labeled proteins.
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DOI:
10.1021/ja9020233
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发表时间:
2009-07-15
影响因子:
15
通讯作者:
Matthews S
中科院分区:
文献类型:
--
作者:
Xu Y;Liu M;Simpson PJ;Isaacson R;Cota E;Marchant J;Yang D;Zhang X;Freemont P;Matthews S
Specific methyl labeling schemes and transverse relaxation optimized spectroscopy (TROSY) has extended the molecular size range for the application of NMR spectroscopy to very large proteins (up to ∼1 MDa). Existing strategies for resonance assignment of methyl groups in large systems are based on NMR spectra recorded on smaller fragments and mutants. This is very time-consuming, and chemical shift changes due to mutation or truncation can often complicate interpretation. We have developed a new automated procedure able to rapidly assign the majority of methyl groups in very large proteins, without recourse to mutagenesis or truncated fragments (http://nmr.bc.ic.ac.uk/map-xs/). We demonstrate the effectiveness of this approach on the 300 kDa, ILV-labeled proteasome (α7α7) for which excellent spectra have been previously recorded. Of the observed methyl groups, 99% can be correctly assigned in a matter of minutes without manual intervention.
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DOI:
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发表时间:
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影响因子:
11.1
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通讯作者:
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发表时间:
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影响因子:
11.1
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通讯作者:
Kay, LE