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Information Content of Protein Sequences

✍ Scribed by OLAF WEISS; MIGUEL A JIMÉNEZ-MONTAÑO; HANSPETER HERZEL

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
153 KB
Volume
206
Category
Article
ISSN
0022-5193

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✦ Synopsis

The complexity of large sets of non-redundant protein sequences is measured. This is done by estimating the Shannon entropy as well as applying compression algorithms to estimate the algorithmic complexity. The estimators are also applied to randomly generated surrogates of the protein data. Our results show that proteins are fairly close to random sequences. The entropy reduction due to correlations is only about 1%. However, precise estimations of the entropy of the source are not possible due to "nite sample e!ects. Compression algorithms also indicate that the redundancy is in the order of 1%. These results con"rm the idea that protein sequences can be regarded as slightly edited random strings. We discuss secondary structure and low-complexity regions as causes of the redundancy observed. The "ndings are related to numerical and biochemical experiments with random polypeptides.

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