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Key Structural Features of PigCD45RO as an Essential Regulator of T-cell Antigen Receptor Signaling

T-세포 항원 수용체 매개 신호전달 조절자로서 돼지 CD45RO 구조특성

  • Chai, Han-Ha (Animal Genomics and Bioinformatics Division, National Institute of Animal Science and Collage of Pharmacy, Chonnam National University) ;
  • Lim, Dajeong (Animal Genomics and Bioinformatics Division, National Institute of Animal Science)
  • 채한화 (국립축산과학원 동물유전체과, 전남대학교 약학대학) ;
  • 임다정 (국립축산과학원 동물유전체과)
  • Received : 2019.07.31
  • Accepted : 2019.09.06
  • Published : 2019.09.30
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Abstract

Pig CD45, the leukocyte common antigen, is encoded by the PTPRC gene and CD45 is a T cell-type specific tyrosine phosphatase with alternative splicing of its exons. The CD45 is a coordinated regulator of T cell antigen receptor (TCR) signal transduction achieved by dephosphorylating the phosphotyrosine of its substances, including $CD3{\zeta}$ chain of TCR, Lck, Fyn, and Zap-70 kinase. A dysregulation of CD45 is associated with a multitude of immune disease and has been a target for immuno-drug discovery. To characterize its key structural features with the effects of regulating TCR signaling, this study predicted the unknown structure of pig CD45RO (the smallest isoform) and the complex structure bound to the ITAM (REEpYDV) of $CD3{\zeta}$ chain via homology modeling and docking the peptide, based on the known human CD45 structures. These features were integrated into the structural plasticity of extracellular domains and functional KNRY and PTP signature motifs (the role of a narrow entrance into ITAM binding site) of the tyrosine phosphatase domains in a cytoplasmic region from pig CD45RO. This contributes to the selective recognition of phosphotyrosine from its substrates by adjusting the structural stability and binding affinity of the complex. The characterized features of pigCD45RO can be applied in virtual screening of the T-cell specific immunomodulator.

백혈구 공통 항원인 돼지 CD45는 PTPRC 유전자에 암호화 되어 있으며, CD45엑손의 선택적 스플라이싱에 따라 다른 T-세포에서 발현되는 티로신 인산분해효소이다. CD45는 기질인 TCR의 $CD3{\zeta}$ 사슬, Lck, Fyn, Zap-70 kinase의 인산화된 티로신에서 인산을 분해하여 T-세포 항원 수용체(TCR) 매개 신호전달을 조절한다. CD45의 조절이상은 많은 면역 질환과 관련이 있어서, CD45는 면역약물 개발에 표적이 되어왔다. TCR 신호전달의 조절효과를 가진 주요 구조적 특징을 특성화하기 위해, 사람의 알려진 CD45 구조를 템플릿으로 적용하여 돼지 CD45RO(가장 작은 CD45 isoform)의 단백질 구조와 예측된 돼지 CD45RO 모델구조에 $CD3{\zeta}$ 사슬의 ITAM(REEpYDV)를 도킹하여 CD45RO/ITAM 펩타이드 결합구조를 예측하였다. 돼지 CD45RO의 구조적 특징은 세포외영역의 구조견고성과 세포질 내 티로신 인산분해효소 도메인의 KNRY와 PTP signature 기능모티프(두 기능 모티프는 ITAM 펩타이드 결합부위의 좁은 입구로 역할)에 있었다. 주요 구조특성은 돼지 CD45RO-ITAM 펩타이드 결합구조 안정성과 결합친화력을 조절하면서 기질 선택성에 영향을 준다. 돼지 CD45RO의 구조적 특성은 T-세포에 특이적인 면역 조절제를 탐색하는 데에 적용될 것이다.

Keywords

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