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EcoSal Plus

Domain 4:

Synthesis and Processing of Macromolecules

Small Proteome

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  • Authors: Matthew R. Hemm1, Jeremy Weaver2,3, and Gisela Storz4
  • Editors: Susan T. Lovett5, Deborah Hinton6
  • VIEW AFFILIATIONS HIDE AFFILIATIONS
    Affiliations: 1: Department of Biological Sciences, Towson University, Towson, MD; 2: Division of Molecular and Cellular Biology, Eunice Kennedy Shriver National Institute of Child Health and Human Development, Bethesda, MD; 3: Present address: Thermo Fisher Scientific, Rockford, IL; 4: Division of Molecular and Cellular Biology, Eunice Kennedy Shriver National Institute of Child Health and Human Development, Bethesda, MD; 5: Brandeis University, Waltham, MA; 6: Laboratory of Cell and Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, MD
  • Received 08 December 2019 Accepted 27 February 2020 Published 08 May 2020
  • Address correspondence to Matthew Hemm, [email protected]
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  • Abstract:

    was one of the first species to have its genome sequenced and remains one of the best-characterized model organisms. Thus, it is perhaps surprising that recent studies have shown that a substantial number of genes have been overlooked. Genes encoding more than 140 small proteins, defined as those containing 50 or fewer amino acids, have been identified in in the past 10 years, and there is substantial evidence indicating that many more remain to be discovered. This review covers the methods that have been successful in identifying small proteins and the short open reading frames that encode them. The small proteins that have been functionally characterized to date in this model organism are also discussed. It is hoped that the review, along with the associated databases of known as well as predicted but undetected small proteins, will aid in and provide a roadmap for the continued identification and characterization of these proteins in as well as other bacteria.

  • Citation: Hemm M, Weaver J, Storz G. 2020. Small Proteome, EcoSal Plus 2020; doi:10.1128/ecosalplus.ESP-0031-2019

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/content/journal/ecosalplus/10.1128/ecosalplus.ESP-0031-2019
2020-05-08
2020-08-12

Abstract:

was one of the first species to have its genome sequenced and remains one of the best-characterized model organisms. Thus, it is perhaps surprising that recent studies have shown that a substantial number of genes have been overlooked. Genes encoding more than 140 small proteins, defined as those containing 50 or fewer amino acids, have been identified in in the past 10 years, and there is substantial evidence indicating that many more remain to be discovered. This review covers the methods that have been successful in identifying small proteins and the short open reading frames that encode them. The small proteins that have been functionally characterized to date in this model organism are also discussed. It is hoped that the review, along with the associated databases of known as well as predicted but undetected small proteins, will aid in and provide a roadmap for the continued identification and characterization of these proteins in as well as other bacteria.

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Small Proteome
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Citation: Hemm M, Weaver J, Storz G. 2020. Small Proteome, EcoSal Plus 2020; doi:10.1128/ecosalplus.ESP-0031-2019
/content/ecosalplus/10.1128/ecosalplus.ESP-0031-2019.fig1
Figure 1
(A) Histogram of currently annotated protein-coding genes in compared to those identified in 2013. (B) Histogram of currently annotated small protein genes in compared to those known in 2013. For both (A) and (B), the light gray bars represent small protein genes annotated in 2013, and the dark gray bars represent genes annotated in 2019. Data on annotated genes in 2013 are from K12 MG1655 genome annotation U00096.2. Data on annotated genes in 2019 were compiled from a combination of annotations from EcoCyc ( 92 ) and recent papers identifying new small proteins.
ecosalplus/9/1/ESP-0031-2019_fig_001_thmb.gif
ecosalplus/9/1/ESP-0031-2019_fig_001.gif
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Figure 1

(A) Histogram of currently annotated protein-coding genes in compared to those identified in 2013. (B) Histogram of currently annotated small protein genes in compared to those known in 2013. For both (A) and (B), the light gray bars represent small protein genes annotated in 2013, and the dark gray bars represent genes annotated in 2019. Data on annotated genes in 2013 are from K12 MG1655 genome annotation U00096.2. Data on annotated genes in 2019 were compiled from a combination of annotations from EcoCyc ( 92 ) and recent papers identifying new small proteins.

Citation: Hemm M, Weaver J, Storz G. 2020. Small Proteome, EcoSal Plus 2020; doi:10.1128/ecosalplus.ESP-0031-2019
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Figure 2
The sequence logo for ribosome binding sites is reproduced from reference 93 . Sequences of 12 small protein genes of unknown function are listed below. Red type corresponds to the predicted start codon, while the blue type indicates stretches of four or more G and A residues. Gibbs free energies (ΔG° in kcal/mol) for the interaction between the sequence shown and the 16S RNA were calculated using IntaRNA (http://rna.informatik.uni-freiburg.de/IntaRNA/Input.jsp) ( 94 ). No value is given for the three sequences for which no significant interaction was detected. Rpm (reads per million mapped) values for ribosome profiling carried out in the presence of the inhibitor Onc112 are taken from reference 6 .
ecosalplus/9/1/ESP-0031-2019_fig_002_thmb.gif
ecosalplus/9/1/ESP-0031-2019_fig_002.gif
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Figure 2

The sequence logo for ribosome binding sites is reproduced from reference 93 . Sequences of 12 small protein genes of unknown function are listed below. Red type corresponds to the predicted start codon, while the blue type indicates stretches of four or more G and A residues. Gibbs free energies (ΔG° in kcal/mol) for the interaction between the sequence shown and the 16S RNA were calculated using IntaRNA (http://rna.informatik.uni-freiburg.de/IntaRNA/Input.jsp) ( 94 ). No value is given for the three sequences for which no significant interaction was detected. Rpm (reads per million mapped) values for ribosome profiling carried out in the presence of the inhibitor Onc112 are taken from reference 6 .

Citation: Hemm M, Weaver J, Storz G. 2020. Small Proteome, EcoSal Plus 2020; doi:10.1128/ecosalplus.ESP-0031-2019
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Figure 3
Structures of AcrZ, KdpF, CydX, and CydH (red) in association with the AcrB multidrug efflux pump (PDB 4C48 [ 84 ]), Kdp potassium transporter (PDB 5MRW [ 69 ]), and cytochrome oxidase (PDB 6RKO [ 80 ]), respectively. The approximate position of the membrane is indicated by shading.
ecosalplus/9/1/ESP-0031-2019_fig_003_thmb.gif
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Figure 3

Structures of AcrZ, KdpF, CydX, and CydH (red) in association with the AcrB multidrug efflux pump (PDB 4C48 [ 84 ]), Kdp potassium transporter (PDB 5MRW [ 69 ]), and cytochrome oxidase (PDB 6RKO [ 80 ]), respectively. The approximate position of the membrane is indicated by shading.

Citation: Hemm M, Weaver J, Storz G. 2020. Small Proteome, EcoSal Plus 2020; doi:10.1128/ecosalplus.ESP-0031-2019
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Tables

Small Proteome
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Citation: Hemm M, Weaver J, Storz G. 2020. Small Proteome, EcoSal Plus 2020; doi:10.1128/ecosalplus.ESP-0031-2019
/content/ecosalplus/10.1128/ecosalplus.ESP-0031-2019.T1
Table 1
Overview of known small protein functions
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Table 1

Overview of known small protein functions

Citation: Hemm M, Weaver J, Storz G. 2020. Small Proteome, EcoSal Plus 2020; doi:10.1128/ecosalplus.ESP-0031-2019

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