5eaj | pdb_00005eaj

Crystal structure of DHFR in 0% Isopropanol

spinqualitylabelsall models 5eaj, resolution 1.70Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5eaj is a 2 chain structure with sequence from "bacillus_coli"_migula_1895 "bacillus coli" migula 1895. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CA, CL, FOL Related: 5e8q Gene: folA, AA953_06220, ABE89_23390, ABE90_01590, ABE91_11465, ABE92_27580, ABE93_03540, ABE94_26505, ABE95_19105, AC789_1c00510, ACM16_01115, ACM17_00910, ACM18_00225, ACM19_01115, ACM20_00925, ACM21_22820, BN1008_2275, ECONIH1_00280, ECs0051, EL75_3711, EL79_3822, EL80_3768, HW43_03985, IY32_08385, JD73_13725, NMECO18_25965, PD07_16380, PU06_14795, PU15_01135, PU21_08285, PU33_00085, PU38_11910, PU53_21230, PU69_06270, PU71_09850, PU73_17465, RR31_00265, SK64_04362, SK65_04102, SK81_04106, SY51_00265, TZ57_00270, UC21_17710, UC41_15235, UN86_27670, UN92_06125, WQ64_08430, WQ65_17175, WQ66_04025, WQ69_03315, WQ70_09735, WQ71_08985, WQ72_04470, WQ73_14425, WQ74_13220, WQ77_00770, WQ79_09130, WQ84_04435, WQ86_16125, WQ88_00770, WQ91_15025, WQ92_19155, WQ95_08145, WQ99_15285, WR00_12370, WR01_07485, WR03_05655, WR04_00040, WR05_03890, WR12_01840, WR13_10745, WR16_15930, WR17_04125, WR18_06540, WR19_18465, WR23_10335, WR24_10640, XB00_01295, XB01_19915 ("Bacillus coli" Migula 1895) Activity: Dihydrofolate reductase, with EC number 1.5.1.3 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [C3TR70_ECOLX] Key enzyme in folate metabolism. Catalyzes an essential reaction for de novo glycine and purine synthesis, and for DNA precursor synthesis (By similarity).[PIRNR:PIRNR000194] Publication Abstract from PubMed Optimal enzyme activity depends on a number of factors, including structure and dynamics. The role of enzyme structure is well recognized; however, the linkage between protein dynamics and enzyme activity has given rise to a contentious debate. We have developed an approach that uses an aqueous mixture of organic solvent to control the functionally relevant enzyme dynamics (without changing the structure), which in turn modulates the enzyme activity. Using this approach, we predicted that the hydride transfer reaction catalyzed by the enzyme dihydrofolate reductase (DHFR) from Escherichia coli in aqueous mixtures of isopropanol (IPA) with water will decrease by approximately 3 fold at 20% (v/v) IPA concentration. Stopped-flow kinetic measurements find that the pH-independent khydride rate decreases by 2.2 fold. X-ray crystallographic enzyme structures show no noticeable differences, while computational studies indicate that the transition state and electrostatic effects were identical for water and mixed solvent conditions; quasi-elastic neutron scattering studies show that the dynamical enzyme motions are suppressed. Our approach provides a unique avenue to modulating enzyme activity through changes in enzyme dynamics. Further it provides vital insights that show the altered motions of DHFR cause significant changes in the enzyme's ability to access its functionally relevant conformational substates, explaining the decreased khydride rate. This approach has important implications for obtaining fundamental insights into the role of rate-limiting dynamics in catalysis and as well as for enzyme engineering. Modulating Enzyme Activity by Altering Protein Dynamics with Solvent.,Duff MR Jr, Borreguero JM, Cuneo MJ, Ramanathan A, He J, Kamath G, Chennubhotla SC, Meilleur F, Howell EE, Herwig KW, Myles DAA, Agarwal PK Biochemistry. 2018 Jul 24;57(29):4263-4275. doi: 10.1021/acs.biochem.8b00424., Epub 2018 Jul 6. PMID:29901984 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Dihydrofolate reductase

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