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Flavonoid-mediated inhibition of SARS coronavirus 3C-like protease expressed in Pichia pastoris.


ABSTRACT: The 3C-like protease (3CL(pro)) of severe acute respiratory syndrome associated coronavirus (SARS-CoV) is vital for SARS-CoV replication and is a promising drug target. Recombinant 3CL(pro) was expressed in Pichia pastoris GS115 as a 42 kDa protein that displayed a K ( m ) of 15 ± 2 ?M with Dabcyl-KTSAVLQSGFRKME-Edans as substrate. Purified 3CL(pro) was used for inhibition and kinetic assays with seven flavonoid compounds. The IC(50) of six flavonoid compounds were 47-381 ?M. Quercetin, epigallocatechin gallate and gallocatechin gallate (GCG) displayed good inhibition toward 3CL(pro) with IC(50) values of 73, 73 and 47 ?M, respectively. GCG showed a competitive inhibition pattern with K ( i ) value of 25 ± 1.7 ?M. In molecular docking experiments, GCG displayed a binding energy of -14 kcal mol(-1) to the active site of 3CL(pro) and the galloyl moiety at 3-OH position was required for 3CL(pro) inhibition activity.

SUBMITTER: Nguyen TT 

PROVIDER: S-EPMC7087583 | biostudies-literature | 2012 May

REPOSITORIES: biostudies-literature

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Flavonoid-mediated inhibition of SARS coronavirus 3C-like protease expressed in Pichia pastoris.

Nguyen Thi Thanh Hanh TT   Woo Hye-Jin HJ   Kang Hee-Kyoung HK   Nguyen Van Dao VD   Kim Young-Min YM   Kim Do-Won DW   Ahn Sul-Ah SA   Xia Yongmei Y   Kim Doman D  

Biotechnology letters 20120215 5


The 3C-like protease (3CL(pro)) of severe acute respiratory syndrome associated coronavirus (SARS-CoV) is vital for SARS-CoV replication and is a promising drug target. Recombinant 3CL(pro) was expressed in Pichia pastoris GS115 as a 42 kDa protein that displayed a K ( m ) of 15 ± 2 μM with Dabcyl-KTSAVLQSGFRKME-Edans as substrate. Purified 3CL(pro) was used for inhibition and kinetic assays with seven flavonoid compounds  ...[more]

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