Effect of N-terminal modification on the mode of action between the Xyn11A and Xylotetraose

บทความในวารสาร


ผู้เขียน/บรรณาธิการ


กลุ่มสาขาการวิจัยเชิงกลยุทธ์


รายละเอียดสำหรับงานพิมพ์

รายชื่อผู้แต่งNgenyoung A., Muhammad A., Rattanarojpong T., Sutthibutpong T., Khunrae P.

ผู้เผยแพร่Elsevier

ปีที่เผยแพร่ (ค.ศ.)2021

วารสารInternational Journal of Biological Macromolecules (0141-8130)

Volume number170

หน้าแรก240

หน้าสุดท้าย247

จำนวนหน้า8

นอก0141-8130

URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-85098700940&doi=10.1016%2fj.ijbiomac.2020.12.154&partnerID=40&md5=64dc9257008d0a2221cc8f75ff41bea7

ภาษาEnglish-Great Britain (EN-GB)


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บทคัดย่อ

The purpose of this study was to gain an insight into the effects of mutation-induced binding pocket tilting of the Xyn11A xylanase from Bacillus firmus K-1 in producing a unique hydrolysis characteristic. In this study, the wildtype Xyn11A and its K40L mutant were compared for their hydrolysis patterns on beechwood xylan and xylooligosaccharides of sizes 2 to 6. According to our thin-layer chromatography experiment, the K40L mutant produced a larger amount of xylotetraose leftover than the wildtype. Kinetic determination of the WT and K40L mutant suggested that the higher X4 leftover on TLC was reflected in the decreasing catalytic efficiency (kcat/Km) between enzyme and X4. The mechanisms underlying this efficiency loss were examined through atomistic molecular dynamics (MD) simulations. The MD trajectory analysis showed that the mutation-induced binding pocket tilting resulted in an additional hydrophobic contact between the reducing end of X4 and Trp128. Meanwhile, the interactions between the non-reducing end and the Arg112 residue near the active site became lost, which could decrease the catalytic efficiency. This work suggested that the protein engineering to fine-tune the hydrolysis pattern for some desired xylooligosaccharide products was possible. © 2020 Elsevier B.V.


คำสำคัญ

Xylooligosaccharides


อัพเดทล่าสุด 2023-26-09 ถึง 07:36