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Related Concept Videos

Antimicrobial Proteins01:23

Antimicrobial Proteins

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Antimicrobial proteins are important components of the immune system. They aid the body in combating pathogens by either killing them directly or hindering their replication processes. Four main types of antimicrobial substances are interferons, the complement system, iron-binding proteins, and antimicrobial proteins.
Interferons
Interferons (IFNs) are proteins produced by lymphocytes, macrophages, and fibroblasts infected with viruses. While IFNs cannot prevent viruses from entering and...
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Mining antimicrobial peptides from small open reading frames in Ciona intestinalis.

Yongzhong Lu1, Yu Zhuang, Jie Liu

  • 1Biology Department, Qingdao University of Science and Technology, Qingdao, 266042, China.

Journal of Peptide Science : an Official Publication of the European Peptide Society
|November 21, 2013
PubMed
Summary
This summary is machine-generated.

Small open reading frames (sORFs) in the Ciona intestinalis genome can encode antimicrobial peptides (AMPs). This study identified and validated several sORF-derived AMPs, highlighting their role in innate defense.

Keywords:
antimicrobial activitybioinformaticsgene annotationgenomic sequencesecondary structure

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Area of Science:

  • Genomics
  • Biochemistry
  • Marine Biology

Background:

  • Small open reading frames (sORFs) are often poorly annotated in genomic data despite their potential to encode bioactive peptides.
  • Antimicrobial peptides (AMPs) are crucial components of innate immunity across many organisms.
  • The basal chordate Ciona intestinalis serves as a model organism for studying fundamental biological processes.

Purpose of the Study:

  • To investigate the potential of sORFs in the Ciona intestinalis genome to encode antimicrobial peptides (AMPs).
  • To identify and validate novel AMPs derived from sORFs in C. intestinalis.
  • To explore the role of sORF-encoded AMPs in the innate defense mechanisms of C. intestinalis.

Main Methods:

  • Mining of approximately 4.8 million genomic sequences from C. intestinalis for sORFs using the sORF finder program.
  • Translation of identified sORFs into amino acid sequences and prediction of AMPs using the CAMP server.
  • Selection of ten putative AMPs for experimental validation, including expression analysis (EST matching) and antimicrobial activity assays against bacterial strains.

Main Results:

  • Over 180 peptides deduced from sORFs were predicted to have antimicrobial peptide properties.
  • Six of the ten tested peptides showed significant expressed sequence tag (EST) matches, indicating gene expression in C. intestinalis.
  • Five of the tested peptides demonstrated significant antimicrobial activity against specific bacterial strains.

Conclusions:

  • The Ciona intestinalis genome harbors numerous sORFs with the capacity to encode functional antimicrobial peptides.
  • sORF-derived AMPs represent a significant, yet underappreciated, component of the innate immune system in C. intestinalis.
  • This research provides a foundation for further investigation into the functional roles of sORFs in host defense and peptide evolution.