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Yan-Qiu M, Meng BB, Xu DP, Wang ZQ, Li JM, Huang MQ. Design, synthesis, and anti-tumor activity of derivatives of ring A and C-28 of asiatic acid. J Asian Nat Prod Res 2024; 26:497-509. [PMID: 37670663 DOI: 10.1080/10286020.2023.2253152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2023] [Accepted: 08/25/2023] [Indexed: 09/07/2023]
Abstract
Based on computer-aided drug design (CADD), the active groups of the known active small molecule compounds that can bind to EGFR target protein were analyzed through the molecular docking method. Then, 12 novel asiatic acid derivatives were synthesized by introducing active groups at ring A and C-28 positions of asiatic acid. The structures of these novel compounds were determined by NMR and MS. Furthermore, the anti-tumor activities of these derivatives on human lung cancer cells (A549) and human breast cancer cells (MCF-7) were evaluated by MTT assay. In conclusion, compounds I4 and II3 have stronger anti-cancer activity than parent compounds, the activities were stronger than gefitinib and comparable to afatinib, which may be potential candidate compounds for tumor therapy.
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Affiliation(s)
- Meng Yan-Qiu
- Department of Pharmaceutical Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China
| | - Bei-Bei Meng
- Department of Pharmaceutical Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China
| | - Dong-Ping Xu
- Department of Pharmaceutical Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China
| | - Zhi-Qi Wang
- Department of Pharmaceutical Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China
| | - Jin-Ming Li
- Department of Pharmaceutical Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China
| | - Mei-Qi Huang
- Department of Pharmaceutical Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China
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2
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Xu MJ, Cui YW, Huang MQ, Sui Y. Simultaneous inorganic nitrogen and phosphate removal by aerobic-heterotrophic fungus Fusarium keratoplasticum FSP1: Performance, pathway and application. Bioresour Technol 2024; 393:130141. [PMID: 38040316 DOI: 10.1016/j.biortech.2023.130141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2023] [Revised: 11/15/2023] [Accepted: 11/28/2023] [Indexed: 12/03/2023]
Abstract
Fungi with multiple contaminant removal function have rarely been studied. Here, a novel fungal strain Fusarium keratoplasticum FSP1, which was isolated from halophilic granular sludge, is reported for first time to perform simultaneous nitrogen and phosphate removal. The strain showed wide adaptability under C/N ratios of 30-35, salinities of 0 %-3 % (m/v), and pH of 7.5-9.5. The maximum removal rates of ammonium, nitrate and nitrite were 4.43, 4.01 and 2.97 mg N/L/h. The nitrogen balance, enzyme activity and substrate conversion experiments demonstrated a single strain FSP1 can assimilate inorganic nitrogen and convert inorganic nitrogen to gaseous nitrogen through heterotrophic nitrification or aerobic denitrification. About 39 %-42 % of the degraded phosphorus was in the extracellular polymeric substances (EPS). Orthophosphate was the main phosphorus species in the cell, whereas phosphate monoester and diester were in the EPS. The novel strain FSP1 is a potential candidate for wastewater treatment.
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Affiliation(s)
- Meng-Jiao Xu
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Beijing 100124, China
| | - You-Wei Cui
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Beijing 100124, China.
| | - Mei-Qi Huang
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Beijing 100124, China
| | - Yuan Sui
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Beijing 100124, China
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3
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Yan-Qiu M, Li JM, Wang ZQ, Xu DP, Huang MQ, Meng BB. Design, synthesis, and antitumor activity of novel oleanolic acid analogues targeting EGFR. J Asian Nat Prod Res 2023; 25:1191-1204. [PMID: 37178151 DOI: 10.1080/10286020.2023.2206572] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2023] [Accepted: 04/20/2023] [Indexed: 05/15/2023]
Abstract
Based on the simulated docking of Epidermal growth factor receptor inhibitors with known active small molecule compounds, computer-aided drug design technology was used to analyze key amino acid fragments and determine the active groups binding with key sites. Then, twelve novel analogues of oleanolic acid (OA) were synthesized by introducing active groups at the C-3 and C-28 positions of OA. The structures of these novel analogues were confirmed by NMR and MS. Furthermore, the antitumor activities of these novel analogues were evaluated by MTT assay. As a result, compounds I3 and II3 showed stronger cytotoxicity on tumor cells than positive controls. In conclusion, our study synthesized twelve novel analogues of OA and determined compounds I3 and II3 had better antitumor effect, which may be potential candidate compounds for tumor therapy.
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Affiliation(s)
- Meng Yan-Qiu
- Department of Pharmaceutical Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China
| | - Jin-Ming Li
- Department of Pharmaceutical Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China
| | - Zhi-Qi Wang
- Department of Pharmaceutical Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China
| | - Dong-Ping Xu
- Department of Pharmaceutical Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China
| | - Mei-Qi Huang
- Department of Pharmaceutical Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China
| | - Bei-Bei Meng
- Department of Pharmaceutical Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China
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4
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Meng YQ, Wang ZQ, Li JM, Xu DP, Meng BB, Huang MQ. Synthesis and anti-tumor activity of asiatic acid derivatives targeting VEGFR. J Asian Nat Prod Res 2023; 25:1205-1216. [PMID: 37081794 DOI: 10.1080/10286020.2023.2202855] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2023] [Accepted: 04/10/2023] [Indexed: 05/03/2023]
Abstract
To discovery novel VEGFR inhibitors, 12 novel asiatic acid derivatives were designed by computer-aided drug design (CADD) technology. Then, these novel asiatic acid derivatives were synthesized by introducing active groups at ring A and C-28 positions of asiatic acid. The structures of these novel analogues were confirmed by NMR and MS. Moreover, the anti-tumor activities of these novel asiatic acid derivatives on human hepatoma cells HepG2 and human gastric cancer cells SGC7901 were evaluated by MTT assay. As a result, compounds I2 and II4 showed stronger cytotoxicity on tumor cells than asiatic acid and positive control drugs such as gefitinib and paclitaxel. In conclusion, our study synthesized twelve novel asiatic acid derivatives and determined compounds I2 and II4 had better anti-tumor effect which may be potential candidate compounds for tumor therapy.
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Affiliation(s)
- Yan-Qiu Meng
- Department of Pharmaceutical Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China
| | - Zhi-Qi Wang
- Department of Pharmaceutical Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China
| | - Jin-Ming Li
- Department of Pharmaceutical Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China
| | - Dong-Ping Xu
- Department of Pharmaceutical Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China
| | - Bei-Bei Meng
- Department of Pharmaceutical Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China
| | - Mei-Qi Huang
- Department of Pharmaceutical Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China
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5
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Chen J, Cui YW, Huang MQ, Yan HJ, Li D. Static magnetic field increases aerobic nitrogen removal from hypersaline wastewater in activated sludge with coexistence of fungi and bacteria. Bioresour Technol 2023; 382:129194. [PMID: 37196737 DOI: 10.1016/j.biortech.2023.129194] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2023] [Revised: 05/04/2023] [Accepted: 05/14/2023] [Indexed: 05/19/2023]
Abstract
Fungi have been found to exist in activated sludge treating saline wastewater, but their role in removing pollution has been neglected. This study explored the aerobic removal of total inorganic nitrogen (TIN) from saline wastewater under static magnetic fields (SMFs) with several strengths. Compared to the control, the aerobic removal of TIN was significantly increased by 1.47 times in 50 mT SMF, due to the increased dissimilation nitrogen removal by fungi and bacteria. Under SMF, fungal nitrogen dissimilation removal was significantly increased by 3.65 times. The fungal population size decreased, and its community composition changed significantly under SMF. In contrast, bacterial community composition and population remained relatively stable. Under SMFs, heterotrophic nitrification - aerobic denitrification bacteria Paracoccus and the fungi denitrifying Candida formed a synergistic interaction. This study elucidates the fungal role in aerobic TIN removal and provides an efficient solution to improve TIN removal from saline wastewater by SMF.
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Affiliation(s)
- Jun Chen
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Beijing 100124, China
| | - You-Wei Cui
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Beijing 100124, China.
| | - Mei-Qi Huang
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Beijing 100124, China
| | - Hui-Juan Yan
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Beijing 100124, China
| | - Dong Li
- Beijing Capital Eco-Environment Protection Group Co., Ltd, Beijing 100044, China
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6
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Huang MQ, Cui YW, Yang HJ, Xu MJ, Cui Y, Chen Z. A halophilic aerobic-heterotrophic strain Halomonas venusta SND-01: Nitrogen removal by ammonium assimilation and heterotrophic nitrification-aerobic denitrification. Bioresour Technol 2023; 374:128758. [PMID: 36801440 DOI: 10.1016/j.biortech.2023.128758] [Citation(s) in RCA: 11] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2022] [Revised: 02/10/2023] [Accepted: 02/15/2023] [Indexed: 06/18/2023]
Abstract
Nitrogen (N) removal from high-salinity wastewater is a major challenge. The aerobic-heterotrophic nitrogen removal (AHNR) process has been demonstrated to be feasible for treating hypersaline wastewater. In this study, Halomonas venusta SND-01, a halophilic strain capable of performing AHNR, was isolated from saltern sediment. The strain achieved ammonium, nitrite, and nitrate removal efficiencies of 98%, 81%, and 100%, respectively. The N balance experiment suggests that this isolate removes N mainly via assimilation. Various functional genes related to N metabolism were found in the genome of the strain, establishing a complex AHNR pathway that includes ammonium assimilation, heterotrophic nitrification-aerobic denitrification, and assimilatory nitrate reduction. Four key enzymes in the N removal process were successfully expressed. The strain exhibited high-adaptability under C/N ratios of 5-15, salinities of 2%-10% (m/v), and pH of 6.5-9.5. Therefore, the strain shows high potential for treating saline wastewater with different inorganic N compositions.
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Affiliation(s)
- Mei-Qi Huang
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Beijing 100124, China
| | - You-Wei Cui
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Beijing 100124, China.
| | - Hou-Jian Yang
- Beijing Municipal Pollution Source Management Center, Beijing 100089, China
| | - Meng-Jiao Xu
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Beijing 100124, China
| | - Yubo Cui
- Key Laboratory of Biotechnology and Bioresources Utilization, Ministry of Education, Dalian Minzu University, Dalian 116600, China
| | - Zhaobo Chen
- Key Laboratory of Biotechnology and Bioresources Utilization, Ministry of Education, Dalian Minzu University, Dalian 116600, China
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7
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Huang MQ, Ge F, Hou XC, Chen WL. [The common morphology and clinical significance of the axillary arch]. Zhonghua Wai Ke Za Zhi 2023; 61:168-172. [PMID: 36720627 DOI: 10.3760/cma.j.cn112139-20221017-00446] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Axillary arch is the most common type of axillary muscle fiber variation, with about 10.8% incidence in the Chinese population. Its natural forms are varied and fluid, with different starting points and terminations, and clinicians frequently lack recognition. Under commonly applicated sentinel lymph node biopsy, the axillary arch has been endowed with more clinical significance. The fabric of axillary arch will not only block lymphatic drainage in axilla and unclear anatomical level of axillary dissection, but also compress the axillary neurovascular bundle, causing upper limb venous thrombosis, lymphedema and nerve entrapment. The intumescent axillary arch may also show abnormal axillary bulge. In addition to finding axillary arch during cadaveric study and operation, several of imaging methods availably diagnose axillary arch preoperative, which can create new way for detection of axillary arch and extension of the surgical plan of sentinel lymph node biopsy. Although embryology and comparative anatomy have been used to explain the origin of the axillary arch, most of the ideas are still hypotheses and need further study.
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Affiliation(s)
- M Q Huang
- Third Department of Breast Surgery, the Third Affiliated Hospital of Kunming Medical University, Yunnan Cancer Hospital, Kunming 650118, China
| | - F Ge
- Department of Breast Surgery, the First Affiliated Hospital of Kunming Medical University, Kunming 650032, China
| | - X C Hou
- Third Department of Breast Surgery, the Third Affiliated Hospital of Kunming Medical University, Yunnan Cancer Hospital, Kunming 650118, China
| | - W L Chen
- Third Department of Breast Surgery, the Third Affiliated Hospital of Kunming Medical University, Yunnan Cancer Hospital, Kunming 650118, China
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8
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Huang MQ, Cui YW, Huang JL, Sun FL, Chen S. A novel Pseudomonas aeruginosa strain performs simultaneous heterotrophic nitrification-aerobic denitrification and aerobic phosphate removal. Water Res 2022; 221:118823. [PMID: 35820312 DOI: 10.1016/j.watres.2022.118823] [Citation(s) in RCA: 28] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2022] [Revised: 06/08/2022] [Accepted: 07/03/2022] [Indexed: 06/15/2023]
Abstract
Nitrogen and phosphate removal from wastewater relies on different functional bacteria. In this study, a novel strain affiliated with Pseudomonas aeruginosa was isolated from activated sludge by gradient dilution and performed heterotrophic nitrification-aerobic denitrification and aerobic phosphate removal (HNADPR). The strain showed an ammonium removal efficiency of 87% and a phosphate removal efficiency of 97% under optimal conditions, such as C/N ratio of 10, P/N ratio of 0.1, temperature of 30°C, and pH of 7.5-8.5. The modified Gompertz model could fit well the heterotrophic ammonium nitrification, aerobic nitrite/nitrate denitrification, and aerobic phosphate removal processes. Functional gene amplification indicated that ammonium removal followed the complete HN-AD pathway (NH4+ → NH2OH → NO2- → NO3- → NO2- → NO → N2O → N2). Phosphate removal only occurred under aerobic conditions and ceased under anaerobic conditions. In successive aerobic cycles, the strain persistently took up phosphate. In wastewater, phosphate was aerobically converted into cell membrane, intracellular and extracellular polymeric substrates (EPS). Phosphorus in the form of phosphate monoester was pooled in EPS. A hypothetic aerobic phosphate removal model for strain SNDPR-01 is proposed to improve our understanding of the novel bacterial function of HNADPR.
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Affiliation(s)
- Mei-Qi Huang
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Beijing 100124, China
| | - You-Wei Cui
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Beijing 100124, China.
| | - Ji-Lin Huang
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Beijing 100124, China
| | - Feng-Long Sun
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Beijing 100124, China
| | - Si Chen
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Beijing 100124, China
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9
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Li GN, Niu ZG, Huang MQ, Zou Y, Hu LJ. N,N'-[2,2'-(Phenyl-aza-nedi-yl)bis-(ethane-2,1-di-yl)]dipicolinamide. Acta Crystallogr Sect E Struct Rep Online 2013; 69:o677. [PMID: 23723837 PMCID: PMC3647871 DOI: 10.1107/s1600536813008696] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2013] [Accepted: 03/29/2013] [Indexed: 12/01/2022]
Abstract
The asymmetric unit of the title compound, C22H23N5O2, contains two independent molecules with similar conformations; the terminal pyridine rings are oriented at dihedral angles of 23.99 (8) and 18.07 (8)° with respect to the central benzene ring in one molecule and 28.99 (8) and 23.22 (8)° in the other. In the crystal, N—H⋯O and weak C—H⋯O hydrogen bonds link the molecules into a three-dimensional supramolecular structure. Weak intermolecular C—H⋯π interactions are also observed in the crystal.
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Affiliation(s)
- Gao-Nan Li
- College of Chemistry and Chemical Engineering, Hainan Normal University, Haikou 571158, People's Republic of China
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10
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Patskovsky YV, Huang MQ, Takayama T, Listowsky I, Pearson WR. Distinctive structure of the human GSTM3 gene-inverted orientation relative to the mu class glutathione transferase gene cluster. Arch Biochem Biophys 1999; 361:85-93. [PMID: 9882431 DOI: 10.1006/abbi.1998.0964] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The sequence and exon-intron structure of the human class mu GSTM3 glutathione transferase gene and its orientation with respect to the remainder of the human class mu GSTM gene cluster were determined. The GSTM3 gene is 2847 bp long and is thus considerably shorter than the other class mu genes in the cluster, which range in size from 5325 to 7212 bp. Outside the protein-coding region, the GSTM3 gene does not share significant sequence similarity with other class mu glutathione transferase genes. Identification of overlapping cosmid clones that span the region between GSTM5, the next nearest glutathione transferase gene, and GSTM3 showed that the two genes are about 20,000 bp apart. PCR primers developed from sequences 3'-downstream from the GSTM5 gene were used to identify clones containing the GSTM3 gene. Amplification with these primers showed that the orientation of the GSTM3 gene is 5'-GSTM5-3'-3'-GSTM3-5'. Long-range PCR reactions confirmed this orientation both in the GSTM-YAC2 YAC clone, which contains the five class mu glutathione transferase genes on chromosome 1, and in human DNA. This tail-to-tail orientation is consistent with an evolutionary model of class mu glutathione transferase divergence from a pair of tail-to-tail "M1-like" and "M3-like" class mu glutathione transferase genes that was present at the mammalian radiation to the current organization of multiple head-to-tail M1-like genes tail-to-tail with a single M3-like gene with distinct structural properties and expression patterns.
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Affiliation(s)
- Y V Patskovsky
- Department of Biochemistry, Albert Einstein College of Medicine, Bronx, New York, 10461, USA
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11
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Zhang YD, Budnick JI, Hines WA, Huang MQ, Wallace WE. Giant moment of Fe16N2 as evidenced by 57Fe NMR studies. Phys Rev B Condens Matter 1996; 54:51-54. [PMID: 9984221 DOI: 10.1103/physrevb.54.51] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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12
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Huang MQ. [Care of allogeneic orthotopic transplantation of liver]. Zhonghua Hu Li Za Zhi 1996; 31:140-2. [PMID: 8826192] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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13
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Huang MQ, Dai YB, Huang CS. Decays of excited charmed Lambda -type and Sigma -type baryons in heavy hadron chiral perturbation theory. Phys Rev D Part Fields 1995; 52:3986-3992. [PMID: 10019625 DOI: 10.1103/physrevd.52.3986] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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14
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Wang ZF, Huang MQ, Zou XM, Zhou HM. Unfolding, conformational change of active sites and inactivation of creatine kinase in SDS solutions. Biochim Biophys Acta 1995; 1251:109-14. [PMID: 7669799 DOI: 10.1016/0167-4838(95)00088-c] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
It has been reported that inactivation occurs before noticeable conformational change can be detected during denaturation of creatine kinase (ATP: creatine N-phosphotransferase, EC 2.7.3.2) and other enzymes by guanidinium chloride or urea. Therefore, Tsou suggested that enzyme active sites may display more conformational flexibility than the enzyme molecules as a whole [Tsou (1986) Trends Biochem. Sci. 11, 427-429; Tsou (1993) Science 262, 380-381]. In this study, the conformational change of the active site, the unfolding of the whole molecule and the inactivation of creatine kinase in solutions of different concentrations of SDS are compared. The results show that, at low SDS concentrations, the conformational change of the active site and inactivation of the enzyme occur to nearly the same extent. However, both of these changes occur at much lower concentrations of SDS than required to significantly unfold the enzyme molecule. The rates of conformational changes of enzyme active sites are markedly faster than those of inactivation. However, at the same SDS concentration, both the inactivation rate and the rate of the active site conformational change are much faster than that of the unfolding of the enzyme molecule as a whole. The above results provide direct evidence of the flexibility of the active site of creatine kinase.
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Affiliation(s)
- Z F Wang
- Department of Biological Science and Biotechnology, Tsinghua University, Beijing, People's Republic of China
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15
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16
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Abstract
The conformational changes of aminoacylase during unfolding at alkaline pH have been followed by fluorescence emission, circular dichroism (CD) and ultraviolet difference spectra. The results of comparison of inactivation and conformation show that much lower values of alkaline pH are required to bring about inactivation than significant conformational change of the enzyme molecule. At pH above 12, although the enzyme has been inactivated, the apparently fully unfolded enzyme retains some ordered secondary structure. At pH 12 by adding KCl, the relatively unfolded state of denatured enzyme changes into a compact conformational state by hydrophobic collapsing, but no new secondary structure is formed. On decreasing the pH from pH 12 to approximate neutrality, the unfolded enzyme also undertakes the similar conformational transition. It can be suggested that hydrophobic collapsed intermediate may be a general intermediate conformational state from alkaline unfolded state to native state.
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Affiliation(s)
- M Q Huang
- Department of Biological Science and Biotechnology, Tsinghua University, China
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17
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Le WP, Yan SX, Huang MQ, Zhang YX, Zhou HM. Kinetics of irreversible inhibition of yeast alcohol dehydrogenase during modification by o-phthaldehyde. Enzyme Protein 1994; 48:183-90. [PMID: 8589805 DOI: 10.1159/000474985] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
The kinetic theory of the substrate reaction during irreversible inhibition of enzyme activity described previously has been applied to a study on the kinetics of the course of inactivation of yeast alcohol dehydrogenase (YADH) by o-phthaldehyde (OPTA). The microscopic constants for the reaction of the inactivators with the free enzyme and with the enzyme-substrate complexes were determined. The inactivation is a monophasic pseudo-first-order reaction with OPTA. The apparent rate constant A is independent of the OPTA concentration, indicating that the inactivation is a noncomplexing inhibition. The marked protective effect of substrates on the inactivation of YADH by OPTA has been observed. This result suggests that the modification of the enzyme by OPTA may occur at the active site.
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Affiliation(s)
- W P Le
- Department of Biology, Xiamen University, People's Republic of China
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18
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Huang MQ. [Panmyelosis--a report of 4 cases]. Zhonghua Zhong Liu Za Zhi 1993; 15:464-6. [PMID: 8200290] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
From January 1987 to December 1990, 4 cases of panmyelosis were diagnosed in our hospital, which accounted for 1.36% of all acute nonlymphocytic leukemia cases. The clinical manifestation was similar to that of acute leukemia Hb ranged from 38 to 60 g/L, WBC 5.6 x 10(9)-14.0 x 10(9)/L, blasts in peripheral blood 1%-47%. Erythroblasts and megakaryocytes were also seen in peripheral blood. Platelets were 13 x 10(9)-240 x 10(9)/L. The myelogram showed hypercellularity. Myeloblast type I+type II accounted for 26.1%-51.6% of non-erythrocytic cells. Auer body could be seen in three cases and there was a leukemic gap in each. Erythrocytic series was 34.5%-84.5% with abnormal erythroblasts. PAS staining was positive in 60%-100% erythroblasts. Megakaryocytes were 545- > 1,000/1.5 cm x 3 cm and megakaryoblasts plus promegakaryocytes were 32%-43%. There were micro-megakaryoblasts like lymphocyte in size in marrow smear and PAS staining for megakaryocytes was strongly positive. The diagnostic criteria, differential diagnosis and treatment for the disease were discussed.
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MESH Headings
- Adult
- Child
- Diagnosis, Differential
- Female
- Humans
- Leukemia, Erythroblastic, Acute/diagnosis
- Leukemia, Erythroblastic, Acute/drug therapy
- Leukemia, Megakaryoblastic, Acute/diagnosis
- Leukemia, Megakaryoblastic, Acute/drug therapy
- Leukemia, Myeloid, Acute/diagnosis
- Male
- Middle Aged
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19
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Chen YZ, Lu LH, Huang MQ. [Biphenotypic acute leukemia. Clinical, morphological, cytochemical and immunophenotypic studies]. Zhonghua Nei Ke Za Zhi 1991; 30:678-81, 729. [PMID: 1726144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The blast cells from 2 cases of acute leukemic patients classified as M1 type by FAB criterion simultaneously expressed lymphoid markers such as SmIgG, CD19, CD20, DR, PAS in case 1 and CD9, CD10, DR, PAS in case 2. The blast cells of these two cases also expressed CD38 antigen. The data on phenotype and cytochemistry in these two cases fulfil the criteria of biphenotypic acute leukemia proposed by Dr. Gale. The problems in diagnosis, treatment and prognosis of this kind of mixed acute leukemia were discussed.
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MESH Headings
- ADP-ribosyl Cyclase
- ADP-ribosyl Cyclase 1
- Adult
- Antigens, CD/analysis
- Antigens, CD20
- Antigens, Differentiation/analysis
- Antigens, Differentiation, B-Lymphocyte/analysis
- Antigens, Neoplasm/analysis
- Humans
- Immunophenotyping
- Leukemia, Biphenotypic, Acute/diagnosis
- Leukemia, Biphenotypic, Acute/immunology
- Leukemia, Myeloid, Acute/diagnosis
- Leukemia, Myeloid, Acute/immunology
- Male
- Membrane Glycoproteins
- Neprilysin
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Huang MQ. [Prevalence of HBsAg]. Zhonghua Hu Li Za Zhi 1986; 21:370-2. [PMID: 3545512] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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