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arXiv 1510.02469q-bio.BM
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蛋白质第一性原理重复序列

Protein Repeats from First Principles

Pablo Turjanski, R. Gonzalo Parra, Rocío Espada, Verónica Becher, Diego U. Ferreiro

摘要:

一些天然蛋白质显示重复的结构模式。尽管在三级结构水平上高度相似,但单个重复蛋白内的重复在序列水平上可以是极其可变的。我们提出了一个数学定义的重复,并调查这些在不同的蛋白质家族的发生。我们发现,长时间的完美重复在单个天然蛋白质中并不常见,即使是那些已知折叠成周期性结构基序的蛋白质。我们发现,天然重复蛋白在其家族中确实是重复的,表现出丰富的6个氨基酸或更长的延伸,在参考家族中是完美的重复。我们提供了一个系统的量化这种重复性,并表明,这种形式的重复性是不排除的重复蛋白质,但也发生在球状域。这项工作的一个副产品是一个快速的蛋白质家族分类器,它产生了一个给定的蛋白质属于一个给定的家庭的可能性值。

英文摘要:

Some natural proteins display recurrent structural patterns. Despite being highly similar at the tertiary structure level, repetitions within a single repeat protein can be extremely variable at the sequence level. We propose a mathematical definition of a repeat and investigate the occurrences of these in different protein families. We found that long stretches of perfect repetitions are infrequent in individual natural proteins, even for those which are known to fold into structures of recurrent structural motifs. We found that natural repeat proteins are indeed repetitive in their families, exhibiting abundant stretches of 6 amino acids or longer that are perfect repetitions in the reference family. We provide a systematic quantification for this repetitiveness, and show that this form of repetitiveness is not exclusive of repeat proteins, but also occurs in globular domains. A by-product of this work is a fast classifier of proteins into families, which yields likelihood value about a given protein belonging to a given family.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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