Using First Passage Statistics to Extract Environmentally Dependent Amino Acid Correlations

In this work, we study the first passage statistics of amino acid primary sequences, that is the probability of observing an amino acid for the first time at a certain number of residues away from a fixed amino acid. By using this rich mathematical framework, we are able to capture the background di...

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Vydáno v:PloS one Ročník 9; číslo 7; s. e101665
Hlavní autoři: Greenbaum, Benjamin D., Kumar, Pradeep, Libchaber, Albert
Médium: Journal Article
Jazyk:angličtina
Vydáno: United States Public Library of Science 07.07.2014
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Abstract In this work, we study the first passage statistics of amino acid primary sequences, that is the probability of observing an amino acid for the first time at a certain number of residues away from a fixed amino acid. By using this rich mathematical framework, we are able to capture the background distribution for an organism, and infer lengths at which the first passage has a probability that differs from what is expected. While many features of an organism's genome are due to natural selection, others are related to amino acid chemistry and the environment in which an organism lives, constraining the randomness of genomes upon which selection can further act. We therefore use this approach to infer amino acid correlations, and then study how these correlations vary across a wide range of organisms under a wide range of optimal growth temperatures. We find a nearly universal exponential background distribution, consistent with the idea that most amino acids are globally uncorrelated from other amino acids in genomes. When we are able to extract significant correlations, these correlations are reliably dependent on optimal growth temperature, across phylogenetic boundaries. Some of the correlations we extract, such as the enhanced probability of finding, for the first time, a cysteine three residues away from a cysteine or glutamic acid two residues away from an arginine, likely relate to thermal stability. However, other correlations, likely appearing on alpha helical surfaces, have a less clear physiochemical interpretation and may relate to thermal stability or unusual metabolic properties of organisms that live in a high temperature environment.
AbstractList In this work, we study the first passage statistics of amino acid primary sequences, that is the probability of observing an amino acid for the first time at a certain number of residues away from a fixed amino acid. By using this rich mathematical framework, we are able to capture the background distribution for an organism, and infer lengths at which the first passage has a probability that differs from what is expected. While many features of an organism's genome are due to natural selection, others are related to amino acid chemistry and the environment in which an organism lives, constraining the randomness of genomes upon which selection can further act. We therefore use this approach to infer amino acid correlations, and then study how these correlations vary across a wide range of organisms under a wide range of optimal growth temperatures. We find a nearly universal exponential background distribution, consistent with the idea that most amino acids are globally uncorrelated from other amino acids in genomes. When we are able to extract significant correlations, these correlations are reliably dependent on optimal growth temperature, across phylogenetic boundaries. Some of the correlations we extract, such as the enhanced probability of finding, for the first time, a cysteine three residues away from a cysteine or glutamic acid two residues away from an arginine, likely relate to thermal stability. However, other correlations, likely appearing on alpha helical surfaces, have a less clear physiochemical interpretation and may relate to thermal stability or unusual metabolic properties of organisms that live in a high temperature environment.
In this work, we study the first passage statistics of amino acid primary sequences, that is the probability of observing an amino acid for the first time at a certain number of residues away from a fixed amino acid. By using this rich mathematical framework, we are able to capture the background distribution for an organism, and infer lengths at which the first passage has a probability that differs from what is expected. While many features of an organism's genome are due to natural selection, others are related to amino acid chemistry and the environment in which an organism lives, constraining the randomness of genomes upon which selection can further act. We therefore use this approach to infer amino acid correlations, and then study how these correlations vary across a wide range of organisms under a wide range of optimal growth temperatures. We find a nearly universal exponential background distribution, consistent with the idea that most amino acids are globally uncorrelated from other amino acids in genomes. When we are able to extract significant correlations, these correlations are reliably dependent on optimal growth temperature, across phylogenetic boundaries. Some of the correlations we extract, such as the enhanced probability of finding, for the first time, a cysteine three residues away from a cysteine or glutamic acid two residues away from an arginine, likely relate to thermal stability. However, other correlations, likely appearing on alpha helical surfaces, have a less clear physiochemical interpretation and may relate to thermal stability or unusual metabolic properties of organisms that live in a high temperature environment.In this work, we study the first passage statistics of amino acid primary sequences, that is the probability of observing an amino acid for the first time at a certain number of residues away from a fixed amino acid. By using this rich mathematical framework, we are able to capture the background distribution for an organism, and infer lengths at which the first passage has a probability that differs from what is expected. While many features of an organism's genome are due to natural selection, others are related to amino acid chemistry and the environment in which an organism lives, constraining the randomness of genomes upon which selection can further act. We therefore use this approach to infer amino acid correlations, and then study how these correlations vary across a wide range of organisms under a wide range of optimal growth temperatures. We find a nearly universal exponential background distribution, consistent with the idea that most amino acids are globally uncorrelated from other amino acids in genomes. When we are able to extract significant correlations, these correlations are reliably dependent on optimal growth temperature, across phylogenetic boundaries. Some of the correlations we extract, such as the enhanced probability of finding, for the first time, a cysteine three residues away from a cysteine or glutamic acid two residues away from an arginine, likely relate to thermal stability. However, other correlations, likely appearing on alpha helical surfaces, have a less clear physiochemical interpretation and may relate to thermal stability or unusual metabolic properties of organisms that live in a high temperature environment.
Audience Academic
Author Greenbaum, Benjamin D.
Libchaber, Albert
Kumar, Pradeep
AuthorAffiliation 4 Department of Physics, University of Arkansas at Little Rock, Little Rock, Arkansas, United States of America
3 Center for Studies in Physics and Biology, The Rockefeller University, New York, New York, United States of America
Rosalind Franklin University, United States of America
2 The Simons Center for Systems Biology, Institute for Advanced Study, Princeton, New Jersey, United States of America
1 Departments of Medicine, Division of Hematology and Medical Oncology, and Pathology, and the Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, New York, United States of America
AuthorAffiliation_xml – name: 1 Departments of Medicine, Division of Hematology and Medical Oncology, and Pathology, and the Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, New York, United States of America
– name: 2 The Simons Center for Systems Biology, Institute for Advanced Study, Princeton, New Jersey, United States of America
– name: 4 Department of Physics, University of Arkansas at Little Rock, Little Rock, Arkansas, United States of America
– name: 3 Center for Studies in Physics and Biology, The Rockefeller University, New York, New York, United States of America
– name: Rosalind Franklin University, United States of America
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  givenname: Benjamin D.
  surname: Greenbaum
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  givenname: Albert
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  fullname: Libchaber, Albert
BackLink https://www.ncbi.nlm.nih.gov/pubmed/25000191$$D View this record in MEDLINE/PubMed
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CitedBy_id crossref_primary_10_3390_microorganisms10020274
crossref_primary_10_1016_j_jtbi_2016_08_011
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Competing Interests: The authors have declared that no competing interests exist.
Conceived and designed the experiments: BG AL. Performed the experiments: BG. Analyzed the data: BG AL PK. Wrote the paper: BG PK AL.
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Snippet In this work, we study the first passage statistics of amino acid primary sequences, that is the probability of observing an amino acid for the first time at a...
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StartPage e101665
SubjectTerms Amino Acids
Arginine
Biology
Biology and Life Sciences
Chemical bonds
Computational Biology - methods
Correlation
Correlation analysis
Cysteine
Ecosystem
Environment
Environmental statistics
Genomes
Genomics
Glutamic acid
High temperature
High temperature environments
Markov analysis
Natural selection
Organisms
Phylogeny
Physical Sciences
Physics
Physiochemistry
Probability
Proteins
Residues
Sequences
Statistics
Studies
Temperature
Temperature dependence
Thermal stability
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Title Using First Passage Statistics to Extract Environmentally Dependent Amino Acid Correlations
URI https://www.ncbi.nlm.nih.gov/pubmed/25000191
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http://dx.doi.org/10.1371/journal.pone.0101665
Volume 9
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