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Cited by 334

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Overlapping recognition determinants within the ssrA degradation tag allow modulation of proteolysis

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Flynn, Julia M., Levchenko, Igor, Seidel, Meredith, Wickner, Sue H., Sauer, Robert T., Baker, Tania A.·2001·Proceedings of the National Academy of Sciences

Abstract

The ssrA tag, an 11-aa peptide added to the C terminus of proteins stalled during translation, targets proteins for degradation by ClpXP and ClpAP. Mutational analysis of the ssrA tag reveals independent, but overlapping determinants for its interactions with ClpX, ClpA, and SspB, a specificity-enhancing factor for ClpX. ClpX interacts with residues 9–11 at the C terminus of the tag, whereas ClpA recognizes positions 8–10 in addition to residues 1–2 at the N terminus. SspB interacts with residues 1–4 and 7, N-terminal to the ClpX-binding determinants, but overlapping the ClpA determinants. As a result, SspB and ClpX work together to recognize ssrA-tagged substrates efficiently, whereas SspB inhibits recognition of these substrates by ClpA. Thus, dissection of the recognition signals within the ssrA tag provides insight into how multiple proteins function in concert to modulate proteolysis.

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Metadata

Authors
Flynn, J. M., Levchenko, I., Seidel, M., Wickner, S. H., Sauer, R. T., & Baker, T. A.
Venue
Proceedings of the National Academy of Sciences
Published
2001-09-04
Volume
98
Issue
19
Pages
10584-10589
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2099102896
Cited by
334
References
32
FWCI
5.43
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: Overlapping recognition determinants within the ssrA degradation tag allow modulation of proteolysis. https://app.cochat.ai/papers/10.1073/pnas.191375298
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Flynn, J. M., Levchenko, I., Seidel, M., Wickner, S. H., Sauer, R. T., & Baker, T. A. (2001). Overlapping recognition determinants within the ssrA degradation tag allow modulation of proteolysis. Proceedings of the National Academy of Sciences. https://doi.org/10.1073/pnas.191375298

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