@article{35978fe2a0db44ab9d2239bb17747cd9,
title = "Atomic resolution structure of serine protease proteinase K at ambient temperature",
abstract = "Atomic resolution structures (beyond 1.20 {\AA}) at ambient temperature, which is usually hampered by the radiation damage in synchrotron X-ray crystallography (SRX), will add to our understanding of the structure-function relationships of enzymes. Serial femtosecond crystallography (SFX) has attracted surging interest by providing a route to bypass such challenges. Yet the progress on atomic resolution analysis with SFX has been rather slow. In this report, we describe the 1.20 {\AA} resolution structure of proteinase K using 13 keV photon energy. Hydrogen atoms, water molecules, and a number of alternative side-chain conformations have been resolved. The increase in the value of B-factor in SFX suggests that the residues and water molecules adjacent to active sites were flexible and exhibited dynamic motions at specific substrate-recognition sites.",
author = "Tetsuya Masuda and Mamoru Suzuki and Shigeyuki Inoue and Changyong Song and Takanori Nakane and Eriko Nango and Rie Tanaka and Kensuke Tono and Yasumasa Joti and Takashi Kameshima and Takaki Hatsui and Makina Yabashi and Bunzo Mikami and Osamu Nureki and Keiji Numata and So Iwata and Michihiro Sugahara",
note = "Funding Information: The XFEL experiments were carried out at the BL3 of SACLA with the approval of the Japan Synchrotron Radiation Research Institute (JASRI) (proposal nos 2015A8026 and 2015A8048). We performed the synchrotron experiments at the BL26B1 of SPring-8 (proposal no. 2015A1052). This work was supported by the X-ray Free-Electron Laser Priority Strategy Program (MEXT), partly by the Strategic Basic Research Program of Japan Science and Technology Agency (JST), partly by a Grant-in-Aid for Scientific Research from the Japan Society for the Promotion of Science (KAKENHI No. 25650026) and partly by the Platform for Drug Discovery, Informatics, and Structural Life Science (MEXT). C.S. is supported by NRF (2015R1A5A1009962 & 2016R1A2B3010980). The authors thank the SACLA and SPring-8 beamline staff for technical assistance. We thank Allan Nisbet for his useful comments and editing of the manuscript. We are grateful for the computational support from SACLA HPC system and Mini-K super computer system. Publisher Copyright: {\textcopyright} 2017 The Author(s).",
year = "2017",
month = mar,
day = "31",
doi = "10.1038/srep45604",
language = "English",
volume = "7",
journal = "Scientific Reports",
issn = "2045-2322",
publisher = "Nature Publishing Group",
}