Structural and biochemical analysis of the PTPN4 PDZ domain bound to the C-terminal tail of the human papillomavirus E6 oncoprotein

Hye Seon Lee; Hye-Yeoung Yun; Eun-Woo Lee; Ho-Chul Shin; Seung Jun Kim; Bonsu Ku

doi:10.1007/s12275-022-1606-1

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Structural and biochemical analysis of the PTPN4 PDZ domain bound to the C-terminal tail of the human papillomavirus E6 oncoprotein: Hye Seon Lee ¹, Hye-Yeoung Yun ^1,2, Eun-Woo Lee ³, Ho-Chul Shin ¹, Seung Jun Kim ^1,2, Bonsu Ku ^1,2; Journal of Microbiology 2022;60(4):395-401.
DOI: https://doi.org/10.1007/s12275-022-1606-1
Published online: January 28, 2022

¹Disease Target Structure Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon 34141, Republic of Korea, ²Department of Bioscience, University of Science and Technology KRIBB School, Daejeon 34113, Republic of Korea, ³Metabolic Regulation Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon 34141, Republic of Korea¹Disease Target Structure Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon 34141, Republic of Korea, ²Department of Bioscience, University of Science and Technology KRIBB School, Daejeon 34113, Republic of Korea, ³Metabolic Regulation Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon 34141, Republic of Korea

Corresponding author: Seung Jun Kim , Tel: +82-42-860-4246,
Bonsu Ku , Tel: +82-42-860-4246,

Received: 23 November 2021 • Revised: 21 December 2021 • Accepted: 24 December 2021

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Abstract

High-risk genotypes of human papillomaviruses (HPVs) are directly implicated in various abnormalities associated with cellular hyperproliferation, including cervical cancer. E6 is one of two oncoproteins encoded in the HPV genome, which recruits diverse PSD-95/Dlg/ZO-1 (PDZ) domain-containing human proteins through its C-terminal PDZ-binding motif (PBM) to be degraded by means of the proteasome pathway. Among the three PDZ domain-containing protein tyrosine phosphatases, protein tyrosine phosphatase non-receptor type 3 (PTPN3) and PTPN13 were identified to be recognized by HPV E6 in a PBM-dependent manner. However, whether HPV E6 associates with PTPN4, which also has a PDZ domain and functions as an apoptosis regulator, remains undetermined. Herein, we present structural and biochemical evidence demonstrating the direct interaction between the PBM of HPV16 E6 and the PDZ domain of human PTPN4 for the first time. X-ray crystallographic structure determination and binding measurements using isothermal titration calorimetry demonstrated that hydrophobic interactions in which Leu158 of HPV16 E6 plays a key role and a network of intermolecular hydrogen bonds sustain the complex formation between PTPN4 PDZ and the PBM of HPV16 E6. In addition, it was verified that the corresponding motifs from several other highrisk HPV genotypes, including HPV18, HPV31, HPV33, and HPV45, bind to PTPN4 PDZ with comparable affinities, suggesting that PTPN4 is a common target of various pathogenic HPV genotypes.

Keywords: Flavobacteriaceae;RAS;Rasiella rasia;new genus;seawater recirculating aquaculture system

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Structural and biochemical analysis of the PTPN4 PDZ domain bound to the C-terminal tail of the human papillomavirus E6 oncoprotein

J. Microbiol. 2022;60(4):395-401. Published online January 28, 2022

DOI: https://doi.org/10.1007/s12275-022-1606-1

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