Expression in Pichia pastoris and characterization of APETx2, a specific inhibitor of acid sensing ion channel 3

Raveendra Anangi, Chih Cheng Chen, Yi Wen Lin, Yuan Ren Cheng, Chun Ho Cheng, Yi Chun Chen, Yuan Ping Chu, Woei Jer Chuang

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Acid sensing ion channels (ASICs) are family of proteins predominantly present in the central and peripheral nervous system. They are known to play important roles in the pathophysiology of pain and ischemic stroke. APETx2 is a potent and selective inhibitor of ASIC3-containing channels and was isolated from sea anemone Anthopleura elegantissima. To facilitate the study on the molecular determinants of ASIC3-ligand interactions, we expressed recombinant APETx2 in the Pichia pastoris (P. pastoris) expression system and purified it to homogeneity. Recombinant APETx2 produced in P. pastoris inhibited the acid-evoked ASIC3 current with the IC50 value of 37.3 nM. The potency of recombinant toxin is similar to that of native APETx2. The sequential assignment and structure analysis of APETx2 were obtained by 2D and 3D 15N-edited NMR spectra. Our NMR data suggests that APETx2 produced in P. pastoris retained its native fold. The results presented here provide the first direct evidence that highly disulfide bonded peptide inhibitor of ASIC3, APETx2, can be expressed in P. pastoris with correct fold and high yield. We also showed that the R17A mutant exhibited a decrease in activity, suggesting the feasibility of the use of this expression system to study the interactions between APETx2 and ASIC3. These evidences may serve as the basis for understanding the selectivity and activity of APETx2.

Original languageEnglish
Pages (from-to)1388-1397
Number of pages10
JournalToxicon
Volume56
Issue number8
DOIs
Publication statusPublished - 2010 Dec 1

Fingerprint

Acid Sensing Ion Channel Blockers
Pichia
Acid Sensing Ion Channels
Nuclear magnetic resonance
Neurology
Disulfides
Sea Anemones
Ligands
Peptides
Acids
Peripheral Nervous System
Inhibitory Concentration 50
Proteins
Central Nervous System
Stroke
Pain

All Science Journal Classification (ASJC) codes

  • Toxicology

Cite this

Anangi, Raveendra ; Chen, Chih Cheng ; Lin, Yi Wen ; Cheng, Yuan Ren ; Cheng, Chun Ho ; Chen, Yi Chun ; Chu, Yuan Ping ; Chuang, Woei Jer. / Expression in Pichia pastoris and characterization of APETx2, a specific inhibitor of acid sensing ion channel 3. In: Toxicon. 2010 ; Vol. 56, No. 8. pp. 1388-1397.
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Expression in Pichia pastoris and characterization of APETx2, a specific inhibitor of acid sensing ion channel 3. / Anangi, Raveendra; Chen, Chih Cheng; Lin, Yi Wen; Cheng, Yuan Ren; Cheng, Chun Ho; Chen, Yi Chun; Chu, Yuan Ping; Chuang, Woei Jer.

In: Toxicon, Vol. 56, No. 8, 01.12.2010, p. 1388-1397.

Research output: Contribution to journalArticle

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AU - Anangi, Raveendra

AU - Chen, Chih Cheng

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AB - Acid sensing ion channels (ASICs) are family of proteins predominantly present in the central and peripheral nervous system. They are known to play important roles in the pathophysiology of pain and ischemic stroke. APETx2 is a potent and selective inhibitor of ASIC3-containing channels and was isolated from sea anemone Anthopleura elegantissima. To facilitate the study on the molecular determinants of ASIC3-ligand interactions, we expressed recombinant APETx2 in the Pichia pastoris (P. pastoris) expression system and purified it to homogeneity. Recombinant APETx2 produced in P. pastoris inhibited the acid-evoked ASIC3 current with the IC50 value of 37.3 nM. The potency of recombinant toxin is similar to that of native APETx2. The sequential assignment and structure analysis of APETx2 were obtained by 2D and 3D 15N-edited NMR spectra. Our NMR data suggests that APETx2 produced in P. pastoris retained its native fold. The results presented here provide the first direct evidence that highly disulfide bonded peptide inhibitor of ASIC3, APETx2, can be expressed in P. pastoris with correct fold and high yield. We also showed that the R17A mutant exhibited a decrease in activity, suggesting the feasibility of the use of this expression system to study the interactions between APETx2 and ASIC3. These evidences may serve as the basis for understanding the selectivity and activity of APETx2.

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