Triose Phosphate Isomerase Structure & Mechanism
From Proteopedia
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| + | <StructureSection load='1hti' size='300' side='right' scene='' caption='Human triosephosphate isomerase complex with phosphoglycolic acid [[1hti]]'> | ||
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[[Image:TriosePhosphateIsomerase_Ribbon_pastel_photo_small.jpg|thumb|left|300px|Ribbon drawing for one chain of the "TIM barrel" fold]] | [[Image:TriosePhosphateIsomerase_Ribbon_pastel_photo_small.jpg|thumb|left|300px|Ribbon drawing for one chain of the "TIM barrel" fold]] | ||
===General Information=== | ===General Information=== | ||
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An interesting part of the enzyme is the <scene name='Christian_Krenk_Sandbox/Flexible_loop/1'>flexible loop</scene> that stabilizes the enediol-like transition state. The flexible loop (residues 167-176)<ref>PMID:2204418</ref> closes over the active site like a hinged lid when substrate is bound, thus preventing phosphate from leaving. A four-residue segment of the loop H-bonds with the phosphate group of the substrate.<ref name="book" /> Without the loop, the enediol intermediate would eliminate phosphate, with the end products being inorganic phosphate and toxic methylglyoxal.<ref name="book" /> | An interesting part of the enzyme is the <scene name='Christian_Krenk_Sandbox/Flexible_loop/1'>flexible loop</scene> that stabilizes the enediol-like transition state. The flexible loop (residues 167-176)<ref>PMID:2204418</ref> closes over the active site like a hinged lid when substrate is bound, thus preventing phosphate from leaving. A four-residue segment of the loop H-bonds with the phosphate group of the substrate.<ref name="book" /> Without the loop, the enediol intermediate would eliminate phosphate, with the end products being inorganic phosphate and toxic methylglyoxal.<ref name="book" /> | ||
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| - | {{STRUCTURE_1wyi| PDB=1wyi | SIZE=400| SCENE= |right|CAPTION=Human triosephosphate isomerase, [[1wyi]] }} | ||
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| - | {{STRUCTURE_1hti| PDB=1hti | SIZE=400| SCENE= |right|CAPTION=Human triosephosphate isomerase complex with phosphoglycolic acid [[1hti]] }} | ||
==3D structures of triose phosphate isomerase== | ==3D structures of triose phosphate isomerase== | ||
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For additional information, see: [[Carbohydrate Metabolism]] | For additional information, see: [[Carbohydrate Metabolism]] | ||
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===References=== | ===References=== | ||
<references/> | <references/> | ||
7. Wierenga RK, Kapetaniou EG, Venkatesan R. Triosephosphate isomerase: a highly evolved biocatalyst. Cellular and Molecular Life Sciences. 2010 August 7 67:3961-3982. PMID: 20694739 <ref>PMID:20694739</ref> | 7. Wierenga RK, Kapetaniou EG, Venkatesan R. Triosephosphate isomerase: a highly evolved biocatalyst. Cellular and Molecular Life Sciences. 2010 August 7 67:3961-3982. PMID: 20694739 <ref>PMID:20694739</ref> | ||
Revision as of 12:48, 8 September 2022
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References
- ↑ Kinoshita T, Maruki R, Warizaya M, Nakajima H, Nishimura S. Structure of a high-resolution crystal form of human triosephosphate isomerase: improvement of crystals using the gel-tube method. Acta Crystallogr Sect F Struct Biol Cryst Commun. 2005 Apr 1;61(Pt, 4):346-9. Epub 2005 Mar 24. PMID:16511037 doi:10.1107/S1744309105008341
- ↑ Mande SC, Mainfroid V, Kalk KH, Goraj K, Martial JA, Hol WG. Crystal structure of recombinant human triosephosphate isomerase at 2.8 A resolution. Triosephosphate isomerase-related human genetic disorders and comparison with the trypanosomal enzyme. Protein Sci. 1994 May;3(5):810-21. PMID:8061610
- ↑ 3.0 3.1 Dabrowska A, Kamrowska I, Baranowski T. Purification, crystallization and properties of triosephosphate isomerase from human skeletal muscle. Acta Biochim Pol. 1978;25(3):247-56. PMID:752201
- ↑ 4.0 4.1 4.2 Voet, Donald, Judith G. Voet, and Charlotte W. Pratt. Fundamentals of Biochemistry Life at the Molecular Level. New York: John Wiley & Sons, 2008. p. 495. Print.
- ↑ 5.0 5.1 Lodi PJ, Chang LC, Knowles JR, Komives EA. Triosephosphate isomerase requires a positively charged active site: the role of lysine-12. Biochemistry. 1994 Mar 15;33(10):2809-14. PMID:8130193
- ↑ Lolis E, Petsko GA. Crystallographic analysis of the complex between triosephosphate isomerase and 2-phosphoglycolate at 2.5-A resolution: implications for catalysis. Biochemistry. 1990 Jul 17;29(28):6619-25. PMID:2204418
7. Wierenga RK, Kapetaniou EG, Venkatesan R. Triosephosphate isomerase: a highly evolved biocatalyst. Cellular and Molecular Life Sciences. 2010 August 7 67:3961-3982. PMID: 20694739 [1]
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Christian Krenk, Alexander Berchansky, Diamond B. Reese, Michal Harel, Jane S. Richardson, David Canner
