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Molecular evolution of SRP cycle components: functional implications

S Althoff1, D Selinger, J A Wise

  • 1University of Illinois, Department of Biochemistry, Urbana 61801.

Nucleic Acids Research
|June 11, 1994
PubMed
Summary
This summary is machine-generated.

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Molecular evolution reveals the conserved core of the signal recognition particle (SRP) pathway, essential for protein targeting. Structural variations in SRP RNA and conserved protein motifs highlight its ancient evolutionary origin across all life domains.

Area of Science:

  • Molecular Biology
  • Evolutionary Biology
  • Structural Biology

Background:

  • Signal recognition particle (SRP) is a ribonucleoprotein complex crucial for targeting proteins to the endoplasmic reticulum.
  • Understanding the evolutionary history of SRP components provides insights into fundamental cellular processes.

Purpose of the Study:

  • To investigate the molecular evolution of the SRP pathway.
  • To identify conserved structural motifs and evolutionary relationships among SRP components.

Main Methods:

  • Comparative sequence analysis of SRP RNA (7SL), Srp54 protein, and SRP receptor alpha subunit homologs across diverse organisms.
  • Phylogenetic analysis to infer evolutionary history and identify conserved regions.
  • Structural and functional considerations of SRP components.

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Main Results:

  • Identified significant structural variations in 7SL RNA, particularly the loss of domains I and III in bacteria, suggesting independent evolutionary events.
  • Proposed a conserved core of SRP comprising Srp54 protein, domain IV of SRP RNA, and potentially Srp68 protein.
  • Revealed conserved motifs in Srp54p and SR alpha, including similarities to RNA recognition motifs and GTPase binding sites.
  • Hypothesized a guanine nucleotide dissociation stimulator (GDS) role for a Srp68/72p heterodimer component.

Conclusions:

  • The SRP pathway is ancient, with conserved core components essential for protein targeting across all domains of life.
  • Evolutionary analysis illuminates the functional significance of structural variations in SRP RNA and protein components.
  • Identified novel conserved motifs and proposed new functional roles for SRP components, advancing our understanding of protein export machinery.