Intrinsically disordered proteins(IDPs)are an important class of proteins in all domains of life for their functional importance.However,how nature has shaped the disorder potential of prokaryotic and eukaryotic prote...Intrinsically disordered proteins(IDPs)are an important class of proteins in all domains of life for their functional importance.However,how nature has shaped the disorder potential of prokaryotic and eukaryotic proteins is still not clearly known.Randomly generated sequences are free of any selective constraints,thus these sequences are commonly used as null models.Considering different types of random protein models,here we seek to understand how the disorder potential of natural eukaryotic and prokaryotic proteins differs from random sequences.Comparing proteomewide disorder content between real and random sequences of 12 model organisms,we noticed that eukaryotic proteins are enriched in disordered regions compared to random sequences,but in prokaryotes such regions are depleted.By analyzing the position-wise disorder profile,we show that there is a generally higher disorder near the N-and C-terminal regions of eukaryotic proteins as compared to the random models;however,either no or a weak such trend was found in prokaryotic proteins.Moreover,here we show that this preference is not caused by the amino acid or nucleotide composition at the respective sites.Instead,these regions were found to be endowed with a higher fraction of protein-protein binding sites,suggesting their functional importance.We discuss several possible explanations for this pattern,such as improving the efficiency of protein-protein interaction,ribosome movement during translation,and post-translational modification.However,further studies are needed to clearly understand the biophysical mechanisms causing the trend.展开更多
基金supported by Israeli Concil of Higher Education and Research through Planning and Budgeting Committee(PBC)fellowship program for outstanding post-doctoral researchers from China and Indiasupported in part by a fellowship from the Edmond J.Safra Center for Bioinformatics at Tel Aviv University,Israel。
文摘Intrinsically disordered proteins(IDPs)are an important class of proteins in all domains of life for their functional importance.However,how nature has shaped the disorder potential of prokaryotic and eukaryotic proteins is still not clearly known.Randomly generated sequences are free of any selective constraints,thus these sequences are commonly used as null models.Considering different types of random protein models,here we seek to understand how the disorder potential of natural eukaryotic and prokaryotic proteins differs from random sequences.Comparing proteomewide disorder content between real and random sequences of 12 model organisms,we noticed that eukaryotic proteins are enriched in disordered regions compared to random sequences,but in prokaryotes such regions are depleted.By analyzing the position-wise disorder profile,we show that there is a generally higher disorder near the N-and C-terminal regions of eukaryotic proteins as compared to the random models;however,either no or a weak such trend was found in prokaryotic proteins.Moreover,here we show that this preference is not caused by the amino acid or nucleotide composition at the respective sites.Instead,these regions were found to be endowed with a higher fraction of protein-protein binding sites,suggesting their functional importance.We discuss several possible explanations for this pattern,such as improving the efficiency of protein-protein interaction,ribosome movement during translation,and post-translational modification.However,further studies are needed to clearly understand the biophysical mechanisms causing the trend.
