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Background  Protein aggregation correlates with the development of several debilitating human disorders of growing incidence, such as Alzheimer's and Parkinson's diseases. On the biotechnological side, protein production is often hampered by the accumulation of recombinant proteins into aggregates. Thus, the development of methods to anticipate the aggregation properties of polypeptides is receiving increasing attention. AGGRESCAN is a web-based software for the prediction of aggregation-prone segments in protein sequences, the analysis of the effect of mutations on protein aggregation propensities and the comparison of the aggregation properties of different proteins or protein sets.    Results  AGGRESCAN is based on an aggregation-propensity scale for natural amino acids derived from  in vivo  experiments and on the assumption that short and specific sequence stretches modulate protein aggregation. The algorithm is shown to identify a series of protein fragments involved in the aggregation of disease-related proteins and to predict the effect of genetic mutations on their deposition propensities. It also provides new insights into the differential aggregation properties displayed by globular proteins, natively unfolded polypeptides, amyloidogenic proteins and proteins found in bacterial inclusion bodies.    Conclusion  By identifying aggregation-prone segments in proteins, AGGRESCAN    shall facilitate ( i ) the identification of possible therapeutic targets for anti-depositional strategies in conformational diseases and ( ii ) the anticipation of aggregation phenomena during storage or recombinant production of bioactive polypeptides or polypeptide sets.

AGGRESCAN: a server for the prediction and evaluation of "hot spots" of aggregation in polypeptides