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State of the structure address on MET receptor activation by HGF. Biochem Soc Trans 2021; 49:645-661. [PMID: 33860789 DOI: 10.1042/bst20200394] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2020] [Revised: 02/22/2021] [Accepted: 02/24/2021] [Indexed: 12/12/2022]
Abstract
The MET receptor tyrosine kinase (RTK) and its cognate ligand hepatocyte growth factor (HGF) comprise a signaling axis essential for development, wound healing and tissue homeostasis. Aberrant HGF/MET signaling is a driver of many cancers and contributes to drug resistance to several approved therapeutics targeting other RTKs, making MET itself an important drug target. In RTKs, homeostatic receptor signaling is dependent on autoinhibition in the absence of ligand binding and orchestrated set of conformational changes induced by ligand-mediated receptor dimerization that result in activation of the intracellular kinase domains. A fundamental understanding of these mechanisms in the MET receptor remains incomplete, despite decades of research. This is due in part to the complex structure of the HGF ligand, which remains unknown in its full-length form, and a lack of high-resolution structures of the complete MET extracellular portion in an apo or ligand-bound state. A current view of HGF-dependent MET activation has evolved from biochemical and structural studies of HGF and MET fragments and here we review what these findings have thus far revealed.
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Umitsu M, Sakai K, Tamura-Kawakami K, Matsumoto K, Takagi J. The constitutive high-affinity Met-binding site in the kringle domain is dispensable for the signalling activity of hepatocyte growth factor. J Biochem 2020; 167:577-586. [DOI: 10.1093/jb/mvaa006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2019] [Accepted: 01/07/2020] [Indexed: 01/07/2023] Open
Abstract
AbstractActivation of a tyrosine kinase receptor Met by hepatocyte growth factor (HGF) requires binding of proteolytically activated, two-chain (tc) HGF, but the biochemical detail of this ligand–receptor interaction specificity remains elusive because biologically inactive single chain (sc) HGF can also bind to Met with high affinity. We found that this proteolysis-independent Met binding can be eliminated by mutagenesis introduced in the kringle domain without losing the ability to bind and activate cellular Met receptor after proteolytic activation, arguing against this site’s involvement in the physiological signalling. This non-signal producing Met–HGF interaction can also be eliminated by addition of a heparin mimetic sucrose octasulphate (SOS). By including SOS in the running buffer, we succeeded in detecting cleavage-dependent tcHGF–Met complex formation by size exclusion chromatography.
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Affiliation(s)
- Masataka Umitsu
- Institute for Protein Research, Osaka University, 3-2 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Katsuya Sakai
- Division of Tumor Dynamics and Regulation, Cancer Research Institute, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan
- WPI-Nano Life Science Institute (WPI-NanoLSI), Kanazawa University, Kakuma, Kanazawa 920-1192, Japan
| | - Keiko Tamura-Kawakami
- Institute for Protein Research, Osaka University, 3-2 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Kunio Matsumoto
- Division of Tumor Dynamics and Regulation, Cancer Research Institute, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan
- WPI-Nano Life Science Institute (WPI-NanoLSI), Kanazawa University, Kakuma, Kanazawa 920-1192, Japan
| | - Junichi Takagi
- Institute for Protein Research, Osaka University, 3-2 Yamadaoka, Suita, Osaka 565-0871, Japan
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Distinct Localization of Mature HGF from its Precursor Form in Developing and Repairing the Stomach. Int J Mol Sci 2019; 20:ijms20122955. [PMID: 31212972 PMCID: PMC6628191 DOI: 10.3390/ijms20122955] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2019] [Revised: 06/06/2019] [Accepted: 06/13/2019] [Indexed: 01/23/2023] Open
Abstract
Hepatocyte growth factor (HGF) is secreted as an inactive single-chain HGF (scHGF); however, only proteolytically processed two-chain HGF (tcHGF) can activate the MET receptor. We investigated the localization of tcHGF and activated/phosphorylated MET (pMET) using a tcHGF-specific antibody. In day 16.5 mouse embryos, total HGF (scHGF + tcHGF) was mainly localized in smooth muscle cells close to, but separate from, MET-positive epithelial cells in endodermal organs, including the stomach. In the adult stomach, total HGF was localized in smooth muscle cells, and tcHGF was mainly localized in the glandular base region. Immunostaining for pMET and Lgr5-driven green fluorescent protein (GFP) indicated that pMET localization overlapped with Lgr5+ gastric stem cells. HGF promoted organoid formation similar to EGF, indicating the potential for HGF to promote the survival and growth of gastric stem cells. pMET and tcHGF localizations changed during regeneration following gastric injury. These results indicate that MET is constantly activated in gastric stem cells and that the localization of pMET differs from the primary localization of precursor HGF but has a close relationship to tcHGF. Our results suggest the importance of the microenvironmental generation of tcHGF in the regulation of development, regeneration, and stem cell behavior.
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Brown ZP, Takagi J. Advances in domain and subunit localization technology for electron microscopy. Biophys Rev 2019; 11:149-155. [PMID: 30834502 DOI: 10.1007/s12551-019-00513-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2019] [Accepted: 02/20/2019] [Indexed: 12/26/2022] Open
Abstract
The award of the 2017 Nobel Prize in chemistry, 'for developing cryo-electron microscopy for the high-resolution structure determination of biomolecules in solution', was recognition that this method, and electron microscopy more generally, represent powerful techniques in the scientific armamentarium for atomic level structural assessment. Technical advances in equipment, software, and sample preparation, have allowed for high-resolution structural determination of a range of complex biological machinery such that the position of individual atoms within these mega-structures can be determined. However, not all targets are amenable to attaining such high-resolution structures and some may only be resolved at so-called intermediate resolutions. In these cases, other tools are needed to correctly characterize the domain or subunit orientation and architecture. In this review, we will outline various methods that can provide additional information to help understand the macro-level organization of proteins/biomolecular complexes when high-resolution structural description is not available. In particular, we will discuss the recent development and use of a novel protein purification approach, known as the the PA tag/NZ-1 antibody system, which provides numberous beneficial properties, when used in electron microscopy experimentation.
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Affiliation(s)
- Zuben P Brown
- Department of Biochemistry and Molecular Biophysics, Columbia University, New York, NY, USA.
| | - Junichi Takagi
- Laboratory of Protein Synthesis and Expression, Institute for Protein Research, Osaka University, Osaka, Japan
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Noh J, Kim O, Jung Y, Han H, Kim JE, Kim S, Lee S, Park J, Jung RH, Kim SI, Park J, Han J, Lee H, Yoo DK, Lee AC, Kwon E, Ryu T, Chung J, Kwon S. High-throughput retrieval of physical DNA for NGS-identifiable clones in phage display library. MAbs 2019; 11:532-545. [PMID: 30735467 DOI: 10.1080/19420862.2019.1571878] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
In antibody discovery, in-depth analysis of an antibody library and high-throughput retrieval of clones in the library are crucial to identifying and exploiting rare clones with different properties. However, existing methods have technical limitations, such as low process throughput from the laborious cloning process and waste of the phenotypic screening capacity from unnecessary repetitive tests on the dominant clones. To overcome the limitations, we developed a new high-throughput platform for the identification and retrieval of clones in the library, TrueRepertoire™. This new platform provides highly accurate sequences of the clones with linkage information between heavy and light chains of the antibody fragment. Additionally, the physical DNA of clones can be retrieved in high throughput based on the sequence information. We validated the high accuracy of the sequences and demonstrated that there is no platform-specific bias. Moreover, the applicability of TrueRepertoire™ was demonstrated by a phage-displayed single-chain variable fragment library targeting human hepatocyte growth factor protein.
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Affiliation(s)
- Jinsung Noh
- a Department of Electrical Engineering and Computer Science , Seoul National University , Seoul , Republic of Korea
| | - Okju Kim
- a Department of Electrical Engineering and Computer Science , Seoul National University , Seoul , Republic of Korea.,b Bioengineering Research Institute, Celemics, Inc , Seoul , Republic of Korea
| | - Yushin Jung
- b Bioengineering Research Institute, Celemics, Inc , Seoul , Republic of Korea
| | - Haejun Han
- b Bioengineering Research Institute, Celemics, Inc , Seoul , Republic of Korea
| | - Jung-Eun Kim
- b Bioengineering Research Institute, Celemics, Inc , Seoul , Republic of Korea
| | - Soohyun Kim
- c Department of Biochemistry and Molecular Biology , Seoul National University College of Medicine , Seoul , Republic of Korea.,d Cancer Research Institute , Seoul National University College of Medicine , Seoul , Republic of Korea
| | - Sanghyub Lee
- b Bioengineering Research Institute, Celemics, Inc , Seoul , Republic of Korea
| | - Jaeseong Park
- b Bioengineering Research Institute, Celemics, Inc , Seoul , Republic of Korea
| | - Rae Hyuck Jung
- e Inter-University Semiconductor Research Center , Seoul National University , Seoul , Republic of Korea
| | - Sang Il Kim
- c Department of Biochemistry and Molecular Biology , Seoul National University College of Medicine , Seoul , Republic of Korea.,d Cancer Research Institute , Seoul National University College of Medicine , Seoul , Republic of Korea
| | - Jaejun Park
- b Bioengineering Research Institute, Celemics, Inc , Seoul , Republic of Korea
| | - Jerome Han
- c Department of Biochemistry and Molecular Biology , Seoul National University College of Medicine , Seoul , Republic of Korea.,f Department of Biomedical Science , Seoul National University College of Medicine , Seoul , Republic of Korea
| | - Hyunho Lee
- a Department of Electrical Engineering and Computer Science , Seoul National University , Seoul , Republic of Korea
| | - Duck Kyun Yoo
- c Department of Biochemistry and Molecular Biology , Seoul National University College of Medicine , Seoul , Republic of Korea.,f Department of Biomedical Science , Seoul National University College of Medicine , Seoul , Republic of Korea.,g Neuro-Immune Information Storage Network Research Center , Seoul National University College of Medicine , Seoul , Republic of Korea
| | - Amos C Lee
- h Interdisciplinary Program in Bioengineering , Seoul National University , Seoul , Republic of Korea
| | - Euijin Kwon
- b Bioengineering Research Institute, Celemics, Inc , Seoul , Republic of Korea
| | - Taehoon Ryu
- b Bioengineering Research Institute, Celemics, Inc , Seoul , Republic of Korea
| | - Junho Chung
- c Department of Biochemistry and Molecular Biology , Seoul National University College of Medicine , Seoul , Republic of Korea.,d Cancer Research Institute , Seoul National University College of Medicine , Seoul , Republic of Korea.,f Department of Biomedical Science , Seoul National University College of Medicine , Seoul , Republic of Korea
| | - Sunghoon Kwon
- a Department of Electrical Engineering and Computer Science , Seoul National University , Seoul , Republic of Korea.,e Inter-University Semiconductor Research Center , Seoul National University , Seoul , Republic of Korea.,h Interdisciplinary Program in Bioengineering , Seoul National University , Seoul , Republic of Korea.,i Institutes of Entrepreneurial BioConvergence , Seoul National University , Seoul , Republic of Korea.,j Seoul National University Hospital Biomedical Research Institute , Seoul National University Hospital , Seoul , Republic of Korea
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Arimori T, Kitago Y, Umitsu M, Fujii Y, Asaki R, Tamura-Kawakami K, Takagi J. Fv-clasp: An Artificially Designed Small Antibody Fragment with Improved Production Compatibility, Stability, and Crystallizability. Structure 2017; 25:1611-1622.e4. [PMID: 28919443 DOI: 10.1016/j.str.2017.08.011] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2017] [Revised: 07/22/2017] [Accepted: 08/15/2017] [Indexed: 12/13/2022]
Abstract
Antibody fragments are frequently used as a "crystallization chaperone" to aid structural analysis of complex macromolecules that are otherwise crystallization resistant, but conventional fragment formats have not been designed for this particular application. By fusing an anti-parallel coiled-coil structure derived from the SARAH domain of human Mst1 kinase to the variable region of an antibody, we succeeded in creating a novel chimeric antibody fragment of ∼37 kDa, termed "Fv-clasp," which exhibits excellent crystallization compatibility while maintaining the binding ability of the original IgG molecule. The "clasp" and the engineered disulfide bond at the bottom of the Fv suppressed the internal mobility of the fragment and shielded hydrophobic residues, likely contributing to the high heat stability and the crystallizability of the Fv-clasp. Finally, Fv-clasp antibodies showed superior "chaperoning" activity over conventional Fab fragments, and facilitated the structure determination of an ectodomain fragment of integrin α6β1.
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Affiliation(s)
- Takao Arimori
- Institute for Protein Research, Osaka University, Suita, Osaka 565-0871, Japan
| | - Yu Kitago
- Institute for Protein Research, Osaka University, Suita, Osaka 565-0871, Japan
| | - Masataka Umitsu
- Institute for Protein Research, Osaka University, Suita, Osaka 565-0871, Japan
| | - Yuki Fujii
- Institute for Protein Research, Osaka University, Suita, Osaka 565-0871, Japan
| | - Ryoko Asaki
- Institute for Protein Research, Osaka University, Suita, Osaka 565-0871, Japan
| | | | - Junichi Takagi
- Institute for Protein Research, Osaka University, Suita, Osaka 565-0871, Japan.
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