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Journal Articles

Structure of HIV-1 protease in complex with potent inhibitor KNI-272 determined by high-resolution X-ray and neutron crystallography

Adachi, Motoyasu; Ohara, Takashi; Kurihara, Kazuo; Tamada, Taro; Honjo, Eijiro; Okazaki, Nobuo; Arai, Shigeki; Shoyama, Yoshinari; Kimura, Kaname*; Matsumura, Hiroyoshi*; et al.

Proceedings of the National Academy of Sciences of the United States of America, 106(12), p.4641 - 4646, 2009/03

 Times Cited Count:111 Percentile:90.58(Multidisciplinary Sciences)

To further understand the catalytic mechanism and inhibitor recognition of HIV-1 protease, we need to determine the locations of key hydrogen atoms in the catalytic aspartates Asp25 and Asp125. The structure of HIV-1 protease in complex with transition-state analog KNI-272 was determined by combined neutron crystallography at 1.9 ${AA}$ resolution and X-ray crystallography at 1.4 ${AA}$ resolution. The resulting structural data shows that the catalytic residue Asp25 is protonated and that Asp125 is deprotonated. The proton on Asp25 makes a hydrogen bond with the carbonyl group of the allophenylnorstatine group in KNI-272. The deprotonated Asp125 bonds to the hydroxyl proton of Apns. The results provide direct experimental evidence for proposed aspects of the catalytic mechanism of HIV-1 protease; and can therefore contribute substantially to the development of specific inhibitors for therapeutic application.

JAEA Reports

Improvement of gyrotron by suppression of undesirable waves

Kasugai, Atsushi; Sakamoto, Keishi; Hayashi, Kenichi*; Takahashi, Koji; Shoyama, Hiroaki*; Kajiwara, Ken*; Ikeda, Yoshitaka; Kariya, Tsuyoshi*; Mitsunaka, Yoshika*; Fujii, Tsuneyuki; et al.

JAERI-Research 2002-027, 57 Pages, 2002/11

JAERI-Research-2002-027.pdf:3.6MB

no abstracts in English

Journal Articles

Development and design of an ECRF launching system for ITER

Takahashi, Koji; Imai, Tsuyoshi; Sakamoto, Keishi; Kobayashi, Noriyuki*; Mori, Seiji*; Mori, Kensuke*; Ito, Yasuyuki*; Shoyama, Hiroaki; Kasugai, Atsushi

Fusion Engineering and Design, 56-57, p.587 - 592, 2001/10

 Times Cited Count:7 Percentile:48.62(Nuclear Science & Technology)

no abstracts in English

Journal Articles

High-efficiency oscillation of 170GHz high-power gyrotron at TE$$_{31.8}$$ mode with depressed collector

Shoyama, Hiroaki; Sakamoto, Keishi; Hayashi, Kenichi*; Kasugai, Atsushi; Tsuneoka, Masaki; Takahashi, Koji; Ikeda, Yukiharu; Kariya, Tsuyoshi*; Mitsunaka, Yoshika*; Imai, Tsuyoshi

Japanese Journal of Applied Physics, Part 2, 40(8B), p.L906 - L908, 2001/08

 Times Cited Count:28 Percentile:71.83(Physics, Applied)

no abstracts in English

Journal Articles

1 MW and long pulse operation of Gaussian beam output gyrotron with CVD diamond window for fusion devices

Kasugai, Atsushi; Sakamoto, Keishi; Takahashi, Koji; Kajiwara, Ken; Shoyama, Hiroaki; Ikeda, Yukiharu; Tsuneoka, Masaki; Ikeda, Yoshitaka; Fujii, Tsuneyuki; Kariya, Tsuyoshi*; et al.

Fusion Engineering and Design, 53(1-4), p.399 - 406, 2001/01

 Times Cited Count:17 Percentile:74.75(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Development of 100GHz band high power gyrotron

Shoyama, Hiroaki; Sakamoto, Keishi; Hayashi, Kenichi*; Kasugai, Atsushi; Takahashi, Koji; Tsuneoka, Masaki; Ikeda, Yukiharu; Kariya, Tsuyoshi*; Mitsunaka, Yoshika*; Imai, Tsuyoshi

Shingaku Giho, 100(506), p.39 - 44, 2000/12

no abstracts in English

Journal Articles

Development of high power gyrotron for ECH system

Imai, Tsuyoshi; Sakamoto, Keishi; Kasugai, Atsushi; Tsuneoka, Masaki; Takahashi, Koji; Shoyama, Hiroaki; Ikeda, Yukiharu; Ikeda, Yoshitaka; Kajiwara, Ken; Fujii, Tsuneyuki; et al.

Heisei-12-Nendo Denki Gakkai Genshiryoku Kenkyu Shiryo (NE-00-4), p.19 - 24, 2000/09

no abstracts in English

Journal Articles

Development of 110GHz band gyrotrons and its application for JT-60U and ITER

Sakamoto, Keishi; Kasugai, Atsushi; Shoyama, Hiroaki; Hayashi, Kenichi*; Takahashi, Koji; Tsuneoka, Masaki; Ikeda, Yukiharu; Ikeda, Yoshitaka; Kajiwara, Ken; Moriyama, Shinichi; et al.

25th International Conference on Infrared and Millimeter Waves Conference Digest, p.11 - 12, 2000/00

no abstracts in English

Journal Articles

Development of long pulsed gyrotron for fusion device

Shoyama, Hiroaki; Kasugai, Atsushi; Sakamoto, Keishi; Takahashi, Koji; Tsuneoka, Masaki; Ikeda, Yukiharu; Kajiwara, Ken; Ikeda, Yoshitaka; Fujii, Tsuneyuki; Kariya, Tsuyoshi*; et al.

Journal of Plasma and Fusion Research SERIES, Vol.3, p.368 - 371, 2000/00

no abstracts in English

Journal Articles

Development of high power gyrotron in JAERI

Sakamoto, Keishi; Kasugai, Atsushi; Shoyama, Hiroaki; Takahashi, Koji; Tsuneoka, Masaki; Ikeda, Yukiharu; Kajiwara, Ken; Ikeda, Yoshitaka; Kariya, Tsuyoshi*; Mitsunaka, Yoshika*; et al.

Shingaku Giho, 99(498), p.37 - 42, 1999/12

no abstracts in English

Oral presentation

Structure of HIV-1 protease in complex with potent inhibitor KNI-272 determined by neutron crystallography

Adachi, Motoyasu; Ohara, Takashi; Kurihara, Kazuo; Tamada, Taro; Honjo, Eijiro*; Okazaki, Nobuo; Arai, Shigeki; Shoyama, Yoshinari*; Matsumura, Hiroyoshi*; Adachi, Hiroaki*; et al.

no journal, , 

To understand the catalytic mechanism of HIV-1 protease, we have determined the crystal structure of HIV-1 protease in complex with a transition state mimetic inhibitor, KNI-272 by neutron crystallography. Our results indicates that the carbonyl group of allophenylnorstatine in KNI-272 forms a significant hydrogen bond with protonated Asp 25, and the hydrogen atom from the hydroxyl group of allophenylnorstatine forms a remarkable hydrogen bond with the deprotonated Asp125. These results show direct evidence that Asp25 provides a proton to carbonyl group of substrate and Asp125 contributes to activate the attacking water molecule as a nucleophile.

Oral presentation

Neutron crystal structure analysis of HIV-1 protease complexed with KNI-272

Adachi, Motoyasu; Ohara, Takashi; Kurihara, Kazuo; Tamada, Taro; Honjo, Eijiro; Okazaki, Nobuo; Arai, Shigeki; Shoyama, Yoshinari; Matsumura, Hiroyoshi*; Sugiyama, Shigeru*; et al.

no journal, , 

We have determined a crystal structure of HIV-1 protease by neutron crystallography. The development of HIV-1 protease inhibitors is regarded as a major success of structure-based drug design and contributes to establish highly active anti-retroviral therapy for AIDS. To further understand the catalytic mechanism of HIV-1 protease and interaction between HIV-1 protease and its inhibitor, we have determined the crystal structure of HIV-1 protease in complex with a inhibitor, KNI-272 to 2.3 ${AA}$ resolution by neutron crystallography. Our results indicates that the carbonyl group of allophenylnorstatine (Apns) in KNI-272 forms a significant hydrogen bond with protonated Asp 25, and the hydrogen atom from the hydroxyl group of Apns forms a remarkable hydrogen bond with the deprotonated Asp125. These results show direct evidence that Asp25 provides a proton to carbonyl group of substrate and Asp125 contributes to activate the attacking water molecule as a nucleophile.

Oral presentation

Structure of HIV-1 protease in complex with potent inhibitor KNI-272 determined by neutron crystallography

Adachi, Motoyasu; Ohara, Takashi; Kurihara, Kazuo; Tamada, Taro; Honjo, Eijiro*; Okazaki, Nobuo; Arai, Shigeki; Shoyama, Yoshinari*; Matsumura, Hiroyoshi*; Adachi, Hiroaki*; et al.

no journal, , 

HIV-1 protease is a dimeric aspartic protease that cleaves the nascent polyproteins of HIV-1 and plays an essential role in viral replication. To further understand the catalytic mechanism of HIV-1 protease, we have determined the crystal structure of HIV-1 protease in complex with a transition state mimetic tripeptide inhibitor, KNI-272 to 1.9 ${AA}$; resolution by neutron crystallography in combination with 1.4 ${AA}$; resolution X-ray diffraction data. Our results indicates that the carbonyl group of allophenylnorstatine (Apns) in KNI-272 forms a significant hydrogen bond with protonated Asp 25, and the hydrogen atom from the hydroxyl group of Apns forms a remarkable hydrogen bond with the deprotonated Asp125. These results show direct evidence that Asp25 provides a proton to carbonyl group of substrate and Asp125 contributes to activate the attacking water molecule as a nucleophile.

Oral presentation

Crystal structure analysis of HIV-1 protease by complementary use of synchrotron radiation and neutron

Adachi, Motoyasu; Ohara, Takashi; Kurihara, Kazuo; Tamada, Taro; Honjo, Eijiro*; Okazaki, Nobuo; Arai, Shigeki; Shoyama, Yoshinari*; Matsumura, Hiroyoshi*; Sugiyama, Shigeru*; et al.

no journal, , 

In this study, we determined crystal structures of HIV-1 protease complexed with inhibitor by neutron and X-ray crystallography. Finally, we refined the structures to R-factor of 17.3% and free R-factor 20.3% by neutron crystallography and to R-factor of 10.4 % and free R-factor 12.4% by X-ray crystallography. The result shows that Asp 25 residue is protonated and Asp 125 is deprotonated. These information is important to resolve catalytic mechanism and design of new potent inhibitor.

Oral presentation

Neutron crystallography for investigation of catalytic mechanism of HIV-1 protease

Adachi, Motoyasu; Ohara, Takashi; Kurihara, Kazuo; Tamada, Taro; Honjo, Eijiro; Okazaki, Nobuo; Arai, Shigeki; Shoyama, Yoshinari; Kimura, Kaname*; Matsumura, Hiroyoshi*; et al.

no journal, , 

HIV-1 protease is a dimeric aspartic protease that cleaves the nascent polyproteins of HIV-1 and plays an essential role in viral replication. To further understand the catalytic mechanism of HIV-1 protease, we have determined the crystal structure of HIV-1 protease in complex with a transition state mimetic tripeptide inhibitor, KNI-272 to 1.9 ${AA}$ resolution by neutron crystallography in combination with 1.4 ${AA}$ resolution X-ray diffraction data. Our results indicates that the carbonyl group of allophenylnorstatine in KNI-272 forms a significant hydrogen bond with protonated Asp 25, and the hydrogen atom from the hydroxyl group of Apns forms a remarkable hydrogen bond with the deprotonated Asp125. These results show direct evidence that Asp25 provides a proton to carbonyl group of substrate and Asp125 contributes to activate the attacking water molecule as a nucleophile.

Oral presentation

Structure analysis of HIV-1 protease by neutron diffraction

Adachi, Motoyasu; Ohara, Takashi; Kurihara, Kazuo; Tamada, Taro; Honjo, Eijiro; Okazaki, Nobuo; Arai, Shigeki; Shoyama, Yoshinari; Matsumura, Hiroyoshi*; Sugiyama, Shigeru*; et al.

no journal, , 

no abstracts in English

16 (Records 1-16 displayed on this page)
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