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A knot or not a knot? SETting the record ‘straight’ on proteins

✍ Scribed by William R Taylor; Bing Xiao; Steven J Gamblin; Kuang Lin

Publisher
Elsevier Science
Year
2003
Tongue
English
Weight
212 KB
Volume
27
Category
Article
ISSN
1476-9271

No coin nor oath required. For personal study only.

✦ Synopsis

A novel knot found in the SET domain is examined in the light of five recent crystal structures and their descriptions in the literature. Using the algorithm of Taylor it was established that the backbone chain does not form a true knot. However, only two crosslinks corresponding to hydrogen-bonds were needed to form a knotted structure. Such loosely knotted structures formed by hydrogen-bonded crosslinks were assessed as lying between covalent crosslinks (such as disulphide bonds) and threaded-loops which are formed by close (unbonded) contacts between different parts of the chain. The term pseudo-knot was introduced (from the RNA field) to distinguish hydrogen-bonded 'knots'.

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