✦ LIBER ✦

Evaluation and Optimization of Coherence Transfer in High Molecular Weight Systems

✍ Scribed by Perttu Permi; Arto Annila

Publisher: Elsevier Science
Year: 2002
Tongue: English
Weight: 202 KB
Volume: 155
Category: Article
ISSN: 1090-7807
DOI: 10.1006/jmre.2002.2514

No coin nor oath required. For personal study only.

✦ Synopsis

For very large proteins in the highest magnetic fields, the large chemical shift anisotropy (CSA) of carbonyl carbon deteriorates coherence transfer efficiency in experiments designed for unambiguous sequential backbone assignment. In this communication, coherence throughput of several TROSY experiments is evaluated. Two new experiments, MP-HNCA and HN(CO)CANH, are also introduced as attractive alternatives for sequential assignment purposes of large proteins with correlation time over 50 ns. Their theoretical coherence transfer efficiencies for the interresidual 13 C α correlations are significantly better than in recently introduced MP-CT-HNCA and sequential HNCA experiments. The improvement with the new experiments is observed already on 60.8 kDa homodimer of protein Cel6A at 800 1 H MHz.

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