Most of the therapeutic enzymes, which is used for treatment of lysosomal storage diseases, require the glycans containing mannose-6-phosphate (M-6-P). It has been shown that the increased content of M-6-P glycan enhances lysosomal targeting and, therefore, the efficacy of therapeutic enzymes [1]. We have constructed the glyco-engineered yeast harboring very high content of mannosylphosphorylated N-glycans, which can be converted to M-6-P glycan through an uncapping process [2]. In this study, cell wall mannoproteins of the glyco-engineered yeast were extracted by using hot citrate buffer and then digested with pronase, which generated mannosylphosphorylated glycans as attached to asparagine amino acid (Asn). Through the mild acid hydrolysis for uncapping and α(1,2)-mannosidase treatment for trimming, these Asn-linked glycans were converted to Asn-linked M-6-P glycans, which were specifically purified by titanium dioxide resin. The purified Asn-linked M-6-P glycans could be easily conjugated with the crosslinkers containing an amine-reactive group such as a N-hydroxysuccinimide esters which attacks amine group of Asn. Using a chemical group (maleimide, azide or dibenzo-bicyclo-octyne) at the opposite site of the attached cross-linkers, M-6-P glycans were successfully conjugated to target proteins. Proper conjugation of M-6-P glycan to target protein was confirmed by increase of molecular weight in SDS-PAGE and lectin blot using domain 9 of cation-independent M-6-P receptor. Further, M-6-P glycan-conjugated protein was shown to be internalized and targeted to lysosomes of cells.
저자
Ji-Yeon Kang [ Synthetic Biology and Bioengineering Research Center, Korean Research Institute of Bioscience & Biotechnology, Daejeon 305-806, Korea ]
Keun Koo Shin [ Synthetic Biology and Bioengineering Research Center, Korean Research Institute of Bioscience & Biotechnology, Daejeon 305-806, Korea ]
Ohsuck Kwon [ Synthetic Biology and Bioengineering Research Center, Korean Research Institute of Bioscience & Biotechnology, Daejeon 305-806, Korea ]
Doo-Byoung Oh [ Synthetic Biology and Bioengineering Research Center, Korean Research Institute of Bioscience & Biotechnology, Daejeon 305-806, Korea ]
본 학회는 화학, 생화학, 분자생물학, 미생물학, 식품공학, 의학, 약학, 유전공학 및 생물공학, 환경 및 기타 공업 등 전 분야의 탄수화물관련 이론과 기술을 연구 발전시키고 산학협동을 통해 이를 보급하여 국내 관련 산업의 발전 및 국민생활의 과학화에 기여하고자 하며, 이러한 목표와 비젼의 실현을 위해 회원들이 적극적인 참여와 활동을 전개하고자 한다.