Calpain-resistant fragment(s) of α-synuclein regulates the synuclein-cleaving activity of 20S proteasome

Hyun Jin Kim, Daekyun Lee, Choong Hwan Lee, Kwang Chul Chung, Jongsun Kim, Seung R. Paik

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

α-Synuclein is a pathological component of Parkinson's disease by participating in Lewy body formation. Imbalance in protein turnover could result in the abnormal protein aggregation responsible for eventual neuronal cell death. This in vitro digestion study showed that both m-calpain and 20S proteasome preferentially hydrolyzed the N-terminal half of α-synuclein, which made the hydrophobic NAC and following acidic C-terminal region resistant against the proteolyses. Since the acidic C-terminal region contains the PEST segment-a protein degradation signal enriched with amino acids of proline (P), glutamate (E), serine (S), and threonine (T)-, the PEST segment has not been processed or even required for the proteolyses. α-Synuclein would be recognized primarily by m-calpain since the common substrate was processed by m-calpain five times more effectively than 20S proteasome with kcat/Km of 1.64 × 104 M-1 s-1 and 0.32 × 104 M-1 s-1, respectively. The N-terminally truncated protease-resistant C-terminal fragment of α-syn61-140 was demonstrated to stimulate the 20S proteasome-mediated breakdown of α-synuclein and its mutant forms of Ala53Thr and Ala30Pro. The stimulation for Ala53Thr, however, was noticeably less efficient than those for the other proteins, which might support the previous observation of the prolonged intracellular life span of Ala53Thr by 1.5-fold compared to that of wild-type form. We have hypothesized that the N-terminally truncated C-terminal fragment derived from the abundant α-synuclein through intracellular proteolyses could be involved in various physiological or pathological effects which might be related to the formation of abnormal protein aggregation and subsequent neuronal degeneration by influencing the intracellular protein turnover or directly participating in the aggregate formation.

Original languageEnglish
Pages (from-to)40-47
Number of pages8
JournalArchives of Biochemistry and Biophysics
Volume455
Issue number1
DOIs
Publication statusPublished - 2006 Nov 1

Fingerprint

Synucleins
Calpain
Proteasome Endopeptidase Complex
Proteolysis
Proteins
Lewy Bodies
Agglomeration
Threonine
Proline
Serine
Cell death
Parkinson Disease
Glutamic Acid
Digestion
Cell Death
Observation
Peptide Hydrolases
Amino Acids
Degradation
Substrates

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Biochemistry
  • Molecular Biology

Cite this

Kim, Hyun Jin ; Lee, Daekyun ; Lee, Choong Hwan ; Chung, Kwang Chul ; Kim, Jongsun ; Paik, Seung R. / Calpain-resistant fragment(s) of α-synuclein regulates the synuclein-cleaving activity of 20S proteasome. In: Archives of Biochemistry and Biophysics. 2006 ; Vol. 455, No. 1. pp. 40-47.
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Calpain-resistant fragment(s) of α-synuclein regulates the synuclein-cleaving activity of 20S proteasome. / Kim, Hyun Jin; Lee, Daekyun; Lee, Choong Hwan; Chung, Kwang Chul; Kim, Jongsun; Paik, Seung R.

In: Archives of Biochemistry and Biophysics, Vol. 455, No. 1, 01.11.2006, p. 40-47.

Research output: Contribution to journalArticle

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