Are structural biases at protein termini a signature of vectorial folding?

Details Are structural biases at protein termini a signature of vectorial folding? Are structural biases at protein termini a signature of vectorial folding?

2005-10-19

arxiv.org/abs/q-bio/0510038v1

Biology

Quantitative Biology

Biomolecules

7 pages, 3 figures, 1 table

Scientific paper

Experimental investigations of the biosynthesis of a number of proteins have pointed out that part of the native structure can be acquired already during translation. We carried out a comprehensive statistical analysis of some average structural properties of proteins that have been put forward as possible signatures of this progressive buildup process. Contrary to a widespread belief, it is found that there is no major propensity of the amino acids to form contacts with residues that are closer to the N terminus. Moreover, it is found that the C terminus is significantly more compact and locally-organized than the N one. Also this bias, though, is unlikely to be related to vectorial effects, since it correlates with subtle differences in the primary sequence. These findings indicate that even if proteins aquire their structure vectorially no signature of this seems to be detectable in their average structural properties.

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