1
|
Chen H, Volgraf M, Do S, Kolesnikov A, Shore DG, Verma VA, Villemure E, Wang L, Chen Y, Hu B, Lu AJ, Wu G, Xu X, Yuen PW, Zhang Y, Erickson SD, Dahl M, Brotherton-Pleiss C, Tay S, Ly JQ, Murray LJ, Chen J, Amm D, Lange W, Hackos DH, Reese RM, Shields SD, Lyssikatos JP, Safina BS, Estrada AA. Discovery of a Potent (4R,5S)-4-Fluoro-5-methylproline Sulfonamide Transient Receptor Potential Ankyrin 1 Antagonist and Its Methylene Phosphate Prodrug Guided by Molecular Modeling. J Med Chem 2018; 61:3641-3659. [DOI: 10.1021/acs.jmedchem.8b00117] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
| | | | | | | | | | | | | | | | - Yong Chen
- Pharmaron-Beijing Co. Ltd., 6 Taihe Road, BDA, Beijing 100176, P. R. China
| | - Baihua Hu
- Pharmaron-Beijing Co. Ltd., 6 Taihe Road, BDA, Beijing 100176, P. R. China
| | - Ai-Jun Lu
- Pharmaron-Beijing Co. Ltd., 6 Taihe Road, BDA, Beijing 100176, P. R. China
| | - Guosheng Wu
- Pharmaron-Beijing Co. Ltd., 6 Taihe Road, BDA, Beijing 100176, P. R. China
| | - Xiaofeng Xu
- Pharmaron-Beijing Co. Ltd., 6 Taihe Road, BDA, Beijing 100176, P. R. China
| | - Po-wai Yuen
- Pharmaron-Beijing Co. Ltd., 6 Taihe Road, BDA, Beijing 100176, P. R. China
| | - Yamin Zhang
- Pharmaron-Beijing Co. Ltd., 6 Taihe Road, BDA, Beijing 100176, P. R. China
| | - Shawn D. Erickson
- Small Molecule Research, Pharmaceutical Research and Early Drug Development, Hoffmann-La Roche Inc., 340 Kingsland Street, Nutley, New Jersey 07110, United States
| | - Martin Dahl
- Small Molecule Research, Pharmaceutical Research and Early Drug Development, Hoffmann-La Roche Inc., 340 Kingsland Street, Nutley, New Jersey 07110, United States
| | - Christine Brotherton-Pleiss
- Small Molecule Research, Pharmaceutical Research and Early Drug Development, Hoffmann-La Roche Inc., 340 Kingsland Street, Nutley, New Jersey 07110, United States
| | | | | | | | | | - Desiree Amm
- Ion Channels Group, Evotec AG, Manfred Eigen Campus, Essener Bogen 7, 22419 Hamburg, Germany
| | - Wienke Lange
- Ion Channels Group, Evotec AG, Manfred Eigen Campus, Essener Bogen 7, 22419 Hamburg, Germany
| | | | | | | | | | | | | |
Collapse
|
2
|
Erickson SD, Smith TJ, Moses LM, Watt RK, Colton JS. Non-native Co-, Mn-, and Ti-oxyhydroxide nanocrystals in ferritin for high efficiency solar energy conversion. Nanotechnology 2015; 26:015703. [PMID: 25490522 DOI: 10.1088/0957-4484/26/1/015703] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Quantum dot solar cells seek to surpass the solar energy conversion efficiencies achieved by bulk semiconductors. This new field requires a broad selection of materials to achieve its full potential. The 12 nm spherical protein ferritin can be used as a template for uniform and controlled nanocrystal growth, and to then house the nanocrystals for use in solar energy conversion. In this study, precise band gaps of titanium, cobalt, and manganese oxyhydroxide nanocrystals within ferritin were measured, and a change in band gap due to quantum confinement effects was observed. The range of band gaps obtainable from these three types of nanocrystals is 2.19-2.29 eV, 1.93-2.15 eV, and 1.60-1.65 eV respectively. From these measured band gaps, theoretical efficiency limits for a multi-junction solar cell using these ferritin-enclosed nanocrystals are calculated and found to be 38.0% for unconcentrated sunlight and 44.9% for maximally concentrated sunlight. If a ferritin-based nanocrystal with a band gap similar to silicon can be found (i.e. 1.12 eV), the theoretical efficiency limits are raised to 51.3% and 63.1%, respectively. For a current matched cell, these latter efficiencies become 41.6% (with an operating voltage of 5.49 V), and 50.0% (with an operating voltage of 6.59 V), for unconcentrated and maximally concentrated sunlight respectively.
Collapse
Affiliation(s)
- S D Erickson
- Department of Physics and Astronomy, Brigham Young University, Provo, UT 84602, USA
| | | | | | | | | |
Collapse
|
3
|
Colton JS, Erickson SD, Smith TJ, Watt RK. Sensitive detection of surface- and size-dependent direct and indirect band gap transitions in ferritin. Nanotechnology 2014; 25:135703. [PMID: 24583827 DOI: 10.1088/0957-4484/25/13/135703] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Ferritin is a protein nano-cage that encapsulates minerals inside an 8 nm cavity. Previous band gap measurements on the native mineral, ferrihydrite, have reported gaps as low as 1.0 eV and as high as 2.5-3.5 eV. To resolve this discrepancy we have used optical absorption spectroscopy, a well-established technique for measuring both direct and indirect band gaps. Our studies included controls on the protein nano-cage, ferritin with the native ferrihydrite mineral, and ferritin with reconstituted ferrihydrite cores of different sizes. We report measurements of an indirect band gap for native ferritin of 2.140 ± 0.015 eV (579.7 nm), with a direct transition appearing at 3.053 ± 0.005 eV (406.1 nm). We also see evidence of a defect-related state having a binding energy of 0.220 ± 0.010 eV . Reconstituted ferrihydrite minerals of different sizes were also studied and showed band gap energies which increased with decreasing size due to quantum confinement effects. Molecules that interact with the surface of the mineral core also demonstrated a small influence following trends in ligand field theory, altering the native mineral's band gap up to 0.035 eV.
Collapse
Affiliation(s)
- J S Colton
- Department of Physics and Astronomy, Brigham Young University, Provo UT 84602, USA
| | | | | | | |
Collapse
|
4
|
Qian Y, Conde-Knape K, Erickson SD, Falcioni F, Gillespie P, Hakimi I, Mennona F, Ren Y, Salari H, So SS, Tilley JW. Potent MCH-1 receptor antagonists from cis-1,4-diaminocyclohexane-derived indane analogs. Bioorg Med Chem Lett 2013; 23:4216-20. [DOI: 10.1016/j.bmcl.2013.05.017] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2013] [Revised: 04/29/2013] [Accepted: 05/07/2013] [Indexed: 11/15/2022]
|
5
|
Martin RE, Bissantz C, Gavelle O, Kuratli C, Dehmlow H, Richter HGF, Obst Sander U, Erickson SD, Kim K, Pietranico-Cole SL, Alvarez-Sánchez R, Ullmer C. Cover Picture: 2-Phenoxy-nicotinamides are Potent Agonists at the Bile Acid Receptor GPBAR1 (TGR5) (ChemMedChem 4/2013). ChemMedChem 2013. [DOI: 10.1002/cmdc.201390010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
|
6
|
Martin RE, Bissantz C, Gavelle O, Kuratli C, Dehmlow H, Richter HGF, Obst Sander U, Erickson SD, Kim K, Pietranico-Cole SL, Alvarez-Sánchez R, Ullmer C. 2-Phenoxy-nicotinamides are Potent Agonists at the Bile Acid Receptor GPBAR1 (TGR5). ChemMedChem 2012; 8:569-76. [DOI: 10.1002/cmdc.201200474] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2012] [Indexed: 12/31/2022]
|
7
|
Erickson SD, Banner B, Berthel S, Conde-Knape K, Falcioni F, Hakimi I, Hennessy B, Kester RF, Kim K, Ma C, McComas W, Mennona F, Mischke S, Orzechowski L, Qian Y, Salari H, Tengi J, Thakkar K, Taub R, Tilley JW, Wang H. Potent, selective MCH-1 receptor antagonists. Bioorg Med Chem Lett 2008; 18:1402-6. [DOI: 10.1016/j.bmcl.2008.01.010] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2007] [Revised: 12/21/2007] [Accepted: 01/02/2008] [Indexed: 10/22/2022]
|
8
|
Wang X, Erickson SD, Iimori T, Still WC. Enantioselective complexation of organic ammonium ions by simple tetracyclic podand ionophores. J Am Chem Soc 2002. [DOI: 10.1021/ja00037a014] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
9
|
|
10
|
van Ophem PW, Peisach D, Erickson SD, Soda K, Ringe D, Manning JM. Effects of the E177K mutation in D-amino acid transaminase. Studies on an essential coenzyme anchoring group that contributes to stereochemical fidelity. Biochemistry 1999; 38:1323-31. [PMID: 9930994 DOI: 10.1021/bi982414z] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
D-Amino acid transaminase is a bacterial enzyme that uses pyridoxal phosphate (PLP) as a cofactor to catalyze the conversion of D-amino acids into their corresponding alpha-keto acids. This enzyme has already been established as a target for novel antibacterial agents through suicide inactivation by a number of compounds. To improve their potency and specificity, the detailed enzyme mechanism, especially the role of its PLP cofactor, is under investigation. Many PLP-dependent transaminases have a negatively charged amino acid residue forming a salt-bridge with the pyridine nitrogen of its cofactor that promotes its protonation to stabilize the formation of a ketimine intermediate, which is subsequently hydrolyzed in the normal transaminase reaction pathway. However, alanine racemase has a positively charged arginine held rigidly in place by an extensive hydrogen bond network that may destabilize the ketimine intermediate, and make it too short-lived for a transaminase type of hydrolysis to occur. To test this hypothesis, we changed Glu-177 into a titratable, positively charged lysine (E177K). The crystal structure of this mutant shows that the positive charge of the newly introduced lysine side chain points away from the nitrogen of the cofactor, which may be due to electrostatic repulsions not being overcome by a hydrogen bond network such as found in alanine racemase. This mutation makes the active site more accessible, as exemplified by both biochemical and crystallographic data: CD measurements indicated a change in the microenvironment of the protein, some SH groups become more easily titratable, and at pH 9.0 the PMP peak appeared around 315 nm rather than at 330 nm. The ability of this mutant to convert L-alanine into D-alanine increased about 10-fold compared to wild-type and to about the same extent as found with other active site mutants. On the other hand, the specific activity of the E177K mutant decreased more than 1000-fold compared to wild-type. Furthermore, titration with L-alanine resulted in the appearance of an enzyme-substrate quinonoid intermediate absorbing around 500 nm, which is not observed with usual substrates or with the wild-type enzyme in the presence of L-alanine. The results overall indicate the importance of charged amino acid side chains relative to the coenzyme to maintain high catalytic efficiency.
Collapse
Affiliation(s)
- P W van Ophem
- Northeastern University, Boston, Massachusetts 02115, USA
| | | | | | | | | | | |
Collapse
|
11
|
van Ophem PW, Erickson SD, Martinez del Pozo A, Haller I, Chait BT, Yoshimura T, Soda K, Ringe D, Petsko G, Manning JM. Substrate inhibition of D-amino acid transaminase and protection by salts and by reduced nicotinamide adenine dinucleotide: isolation and initial characterization of a pyridoxo intermediate related to inactivation. Biochemistry 1998; 37:2879-88. [PMID: 9485439 DOI: 10.1021/bi972842p] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
D-Amino acid transaminase, a pyridoxal phosphate (PLP) enzyme, is inactivated by its natural substrate, D-alanine, concomitant with its alpha-decarboxylation [Martinez del Pozo, A., Yoshimura, T., Bhatia, M. B., Futaki, S., Manning, J. M., Ringe, D., and Soda, K. (1992) Biochemistry 31, 6018-6023; Bhatia, M. B., Martinez del Pozo, A., Ringe, D., Yoshimura, T., Soda, K., and Manning, J. M. (1993) J. Biol. Chem. 268, 17687-17694]. beta-Decarboxylation of d-aspartate to d-alanine leads also to this inactivation [Jones, W. M., van Ophem, P. W., Pospischil, M. A., Ringe, D., Petsko, G., Soda, K., and Manning, J. M. (1996) Protein Sci. 5, 2545-2551]. Using a high-performance liquid chromatography-based method for the determination of pyridoxo cofactors, we detected a new intermediate closely related to the inactivation by d-alanine; its formation occurred at the same rate as the inactivation and upon reactivation it reverted to PLP. Conditions were found under which it was characterized by ultraviolet-visible spectral analysis and mass spectroscopy; it is a pyridoxamine phosphate-like compound with a C2 fragment derived from the substrate attached to the C'-4 of the pyridinium ring and it has a molecular mass of 306 consistent with this structure. In the presence of d-serine, slow accumulation of a quinonoid intermediate is also related to inactivation. The inactivation can be prevented by salts, which possibly stabilize the protonated aldimine coenzyme complex. The reduced cofactor, nicotinamide adenine dinucleotide, prevents D-aspartate-induced inactivation. Both of these events also are related to formation of the novel intermediate.
Collapse
Affiliation(s)
- P W van Ophem
- Northeastern University, Boston, Massachusetts 02115, USA
| | | | | | | | | | | | | | | | | | | |
Collapse
|
12
|
Iimori T, Erickson SD, Rheingold AL, Still W. Enantioselective Complexation with a Conformationally Homogeneous C2 Podand Ionophore. Tetrahedron Lett 1989. [DOI: 10.1016/s0040-4039(01)93394-5] [Citation(s) in RCA: 31] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|