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Roles of the Catalytic Domain and Two Cellulose Binding Domains of Thermomonospora fusca E4 in Cellulose Hydrolysis

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Irwin, Diana, Shin, Dong-Hoon, Zhang, Sheng, Barr, Brian K., Sakon, Joshua, Karplus, P. Andrew, Wilson, David B.·1998·Journal of Bacteriology

Abstract

Thermomonospora fusca E4 is an unusual 90.4-kDa endocellulase comprised of a catalytic domain (CD), an internal family IIIc cellulose binding domain (CBD), a fibronectinlike domain, and a family II CBD. Constructs containing the CD alone (E4-51), the CD plus the family IIIc CBD (E4-68), and the CD plus the fibronectinlike domain plus the family II CBD (E4-74) were made by using recombinant DNA techniques. The activities of each purified protein on bacterial microcrystalline cellulose (BMCC), filter paper, swollen cellulose, and carboxymethyl cellulose were measured. Only the whole enzyme, E4-90, could reach the target digestion of 4.5% on filter paper. Removal of the internal family IIIc CBD (E4-51 and E4-74) decreased activity markedly on every substrate. E4-74 did bind to BMCC but had almost no hydrolytic activity, while E4-68 retained 32% of the activity on BMCC even though it did not bind. A low-activity mutant of one of the catalytic bases, E4-68 (Asp55Cys), did bind to BMCC, although E4-51 (Asp55Cys) did not. The ratios of soluble to insoluble reducing sugar produced after filter paper hydrolysis by E4-90, E4-68, E4-74, and E4-51 were 6.9, 3.5, 1.3, and 0.6, respectively, indicating that the family IIIc CBD is important for E4 processivity.

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Crossref · 10.1128/jb.180.7.1709-1714.1998

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Metadata

Authors
Irwin, D., Shin, D.-H., Zhang, S., Barr, B. K., Sakon, J., Karplus, P. A., & Wilson, D. B.
Venue
Journal of Bacteriology
Published
1998-04
Volume
180
Issue
7
Pages
1709-1714
ISSN
  • 0021-9193 (ISSN-L)
  • 1098-5530
OpenAlex
W2170765652
Cited by
200
References
1
FWCI
9.41
Type
journal article
Language
en
Open access
bronze

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CoChat. (2026). Citation check: Roles of the Catalytic Domain and Two Cellulose Binding Domains of Thermomonospora fusca E4 in Cellulose Hydrolysis. https://app.cochat.ai/papers/10.1128/jb.180.7.1709-1714.1998
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Irwin, D., Shin, D.-H., Zhang, S., Barr, B. K., Sakon, J., Karplus, P. A., & Wilson, D. B. (1998). Roles of the Catalytic Domain and Two Cellulose Binding Domains of Thermomonospora fusca E4 in Cellulose Hydrolysis. Journal of Bacteriology. https://doi.org/10.1128/jb.180.7.1709-1714.1998

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