Solution Structure Of Protein SRP19 Of The Archaeoglobus fulgidus Signal Recognition Particle, Minimized Average Structure

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Submitted: 

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Solution structure of protein SRP19 of Archaeoglobus fulgidus signal recognition particle.

Pakhomova, O.N.Deep, S.Huang, Q.Zwieb, C.Hinck, A.P.

(2002) J Mol Biol 317: 145-158

  • DOI: https://doi.org/10.1006/jmbi.2002.5411
  • Primary Citation of Related Structures:  
    1KVN, 1KVV

  • PubMed Abstract: 

    Protein SRP19 is an essential RNA-binding component of the signal recognition particle (SRP) in Archaea and Eucarya. A three-dimensional solution structure of the 104 residue SRP19 from the hyperthermophilic archaeon Archaeoglobus fulgidus, designated as Af19, was determined by NMR spectroscopy. Af19 contains three beta-strands, two alpha-helical regions, arranged in a betaalphabetabetaalpha topology, a 3(10) helix, and a disordered C-terminal tail. This fold is similar to the betaalphabetabetaalphabeta RNP motif present in numerous other RNA-binding proteins, which engage their cognate RNAs using conserved sequence motifs present within beta-strands 1 and 3. Mutagenesis studies of human SRP19, however, reveal the major contact sites with SRP RNA reside within loops 1, 3, and 4. These contacts were verified by the crystal structure of human SRP19 complexed to SRP RNA helix 6 reported subsequent to the submission of the manuscript. The crystal structure also reveals that, unlike canonical RNP motifs, SRP19 does not engage specific RNA bases through conserved sequence motifs present within beta-strands 1 and 3. Instead, SRP19 uses residues both within and flanking beta-strand 1 to stabilize the complex through direct and indirect contacts to the phosphate backbone of the tetraloop, leaving the bases of the tetraloop exposed. This, coupled with the fact that SRP19 appears relatively rigid and undergoes only minor changes in structure upon RNA binding, may underlie the molecular basis by which SRP19 functions to initiate SRP assembly.

  • Organizational Affiliation

    Department of Biochemistry, Center for Biomolecular Structure Analysis, University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, San Antonio, TX 78229, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
SRP19104Archaeoglobus fulgidusMutation(s): 2 
Gene Names: AF1258
Find proteins for O29010 (Archaeoglobus fulgidus (strain ATCC 49558 / DSM 4304 / JCM 9628 / NBRC 100126 / VC-16))
Explore O29010 
Go to UniProtKB:  O29010
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO29010
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Submitted: 

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-03-20
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2021-10-27
    Changes: Data collection, Database references, Derived calculations
  • Version 1.4: 2024-05-22
    Changes: Data collection