Cited by 59Bacterial Genetics and BiotechnologyATP Synthase and ATPases ResearchHeat shock proteins research

Preprotein-controlled catalysis in the helicase motor of SecA.

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Karamanou, Spyridoula, Gouridis, Giorgos, Papanikou, Efrosyni, Sianidis, Giorgos, Gelis, Ioannis, Keramisanou, Dimitra, Vrontou, Eleftheria, Kalodimos, Charalampos G +1 more·2007·The EMBO Journal

Abstract

The cornerstone of the functionality of almost all motor proteins is the regulation of their activity by binding interactions with their respective substrates. In most cases, the underlying mechanism of this regulation remains unknown. Here, we reveal a novel mechanism used by secretory preproteins to control the catalytic cycle of the helicase 'DEAD' motor of SecA, the preprotein translocase ATPase. The central feature of this mechanism is a highly conserved salt-bridge, Gate1, that controls the opening/closure of the nucleotide cleft. Gate1 regulates the propagation of binding signal generated at the Preprotein Binding Domain to the nucleotide cleft, thus allowing the physical coupling of preprotein binding and release to the ATPase cycle. This relay mechanism is at play only after SecA has been previously 'primed' by binding to SecYEG, the transmembrane protein-conducting channel. The Gate1-controlled relay mechanism is essential for protein translocase catalysis and may be common in helicase motors.

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  • The PBD domain is located close to the two nucleotide binding domains (NBD1 and NBD2) and dynamic movements within the PBD link substrate recognition to ATP binding and hydrolysis.

    “The PBD domain is located close to the two nucleotide binding domains (NBD1 and NBD2) and dynamic movements within the PBD link substrate recognition to ATP binding and hydrolysis”

    From The Dynamic SecYEG Translocon (2021) · cites this paper as Karamanou et al., 2007

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Authors
Karamanou, S., Gouridis, G., Papanikou, E., Sianidis, G., Gelis, I., Keramisanou, D., Vrontou, E., Kalodimos, C. G., & Economou, A.
Affiliations
  • University of Crete (GR)
  • Foundation for Research and Technology Hellas (GR)
  • Rutgers, The State University of New Jersey (US)
Corresponding author
Economou, Anastassios
Venue
The EMBO Journal
Published
2007-05-24
Volume
26
Issue
12
Pages
2904-2914
ISSN
  • 0261-4189 (ISSN-L)
  • 1460-2075
OpenAlex
W2147803352
Cited by
59
References
49
Citations by year
2026: 1 · 2025: 1 · 2024: 2 · 2023: 2 · 2022: 2 · 2021: 3 · 2020: 1 · 2019: 5 · 2018: 4 · 2017: 4 · 2016: 1 · 2015: 5 · 2014: 4 · 2013: 3 · 2012: 6
FWCI
2.32
Type
journal article
Language
en
Open access
Locations
  • The EMBO Journal (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • American Heart Association
  • European Commission
  • Alexander S. Onassis Public Benefit Foundation
  • National Institutes of Health (PENED03ED623)
  • European Regional Development Fund (01AKMON46)
  • National Institute of General Medical Sciences (R01GM073854, GM 73854)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Bacterial Genetics and Biotechnology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › ATP Synthase and ATPases Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Heat shock proteins research
Keywords
SecA, preprotein translocase, ATPase cycle, salt bridges, signal transduction, SecYEG, protein translocation, motor protein regulation
MeSH terms
SEC Translocation Channels, SecA Proteins, Adenosine Triphosphatases, Bacterial Proteins, Catalysis, Enzyme Activation, Temperature, Protein Folding, Membrane Transport Proteins

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