2016
Engineering a de Novo Transport Tunnel
BREZOVSKÝ, Jan; Petra BABKOVÁ; Oksana DEGTJARIK; Andrea FOŘTOVÁ; Artur Wiktor GÓRA et al.Základní údaje
Originální název
Engineering a de Novo Transport Tunnel
Autoři
BREZOVSKÝ, Jan; Petra BABKOVÁ; Oksana DEGTJARIK; Andrea FOŘTOVÁ; Artur Wiktor GÓRA; L. IERMAK; Petra ŘEZÁČOVÁ; Pavel DVOŘÁK; Ivana KUTÁ-SMATANOVÁ; Zbyněk PROKOP; Radka CHALOUPKOVÁ a Jiří DAMBORSKÝ
Vydání
ACS Catalysis, WASHINGTON, AMER CHEMICAL SOC, 2016, 2155-5435
Další údaje
Jazyk
angličtina
Typ výsledku
Článek v odborném periodiku
Obor
10600 1.6 Biological sciences
Stát vydavatele
Spojené státy
Utajení
není předmětem státního či obchodního tajemství
Odkazy
Impakt faktor
Impact factor: 10.614
Označené pro přenos do RIV
Ano
Kód RIV
RIV/00216224:14310/16:00088545
Organizační jednotka
Přírodovědecká fakulta
UT WoS
EID Scopus
Klíčová slova anglicky
transport tunnel; protein engineering; protein design; activity; specificity; substrate inhibition; stability; substrate binding; product release; water dynamics
Změněno: 5. 4. 2017 13:35, Ing. Andrea Mikešková
Anotace
V originále
Transport of ligands between buried active sites and bulk solvent is a key step in the catalytic cycle of many enzymes. The absence of evolutionary optimized transport tunnels is an important barrier limiting the efficiency of biocatalysts prepared by computational design. Creating a structurally defined and functional “hole” into the protein represents an engineering challenge. Here we describe the computational design and directed evolution of a de novo transport tunnel in haloalkane dehalogenase. Mutants with a blocked native tunnel and newly opened auxiliary tunnel in a distinct part of the structure showed dramatically modified properties. The mutants with blocked tunnels acquired specificity never observed with native family members: up to 32 times increased substrate inhibition and 17 times reduced catalytic rates. Opening of the auxiliary tunnel resulted in specificity and substrate inhibition similar to those of the native enzyme and the most proficient haloalkane dehalogenase reported to date (kcat = 57 s–1 with 1,2-dibromoethane at 37 °C and pH 8.6). Crystallographic analysis and molecular dynamics simulations confirmed the successful introduction of a structurally defined and functional transport tunnel. Our study demonstrates that, whereas we can open the transport tunnels with reasonable proficiency, we cannot accurately predict the effects of such change on the catalytic properties. We propose that one way to increase efficiency of an enzyme is the direct its substrates and products into spatially distinct tunnels. The results clearly show the benefits of enzymes with de novo transport tunnels, and we anticipate that this engineering strategy will facilitate the creation of a wide range of useful biocatalysts.
Návaznosti
| GAP207/12/0775, projekt VaV |
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| GAP503/12/0572, projekt VaV |
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| GA16-06096S, projekt VaV |
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| LH14027, projekt VaV |
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| LM2011028, projekt VaV |
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| LO1214, projekt VaV |
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| MUNI/M/1888/2014, interní kód MU |
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