cenA coding sequence encoding Cellulomonas fimi endoglucanase A The cellulolytic bacterium Cellulomonas fimi uses 3 endoglucanases (including CenA, accession M15823) and an exoglucanase in the degradation of cellulose into cellobiose, before using beta-glucosidase to catalyse the conversion of cellobiose to D-glucose.
Sequence and Features
- 10COMPATIBLE WITH RFC
- 12INCOMPATIBLE WITH RFCIllegal NotI site found at 34
Illegal NotI site found at 1178
- 21INCOMPATIBLE WITH RFCIllegal BglII site found at 1091
Illegal BamHI site found at 227
Illegal XhoI site found at 589
Illegal XhoI site found at 838
- 23COMPATIBLE WITH RFC
- 25INCOMPATIBLE WITH RFCIllegal NgoMIV site found at 369
Illegal NgoMIV site found at 1294
- 1000INCOMPATIBLE WITH RFCIllegal BsaI site found at 273
- Group: iGEM Team UESTC-China 2018
- Author: Liang Zhao, Yetao Zou
- Summary: endoglucanase activity assay and congo red assay for enzyme activity
Characterization from iGEM18-UESTC-China
This gene codes for a protein of 448 amino acids with a molecular mass of 46.7 kDa.
Congo Red Assay
This year in order to find out if cenA gene had been expressed successfully in BL21(DE3), the method of Congo Red assay was performed. Luria agar plates with 0.2% CMC were inoculated with BL21(DE3) carrying cenA gene and incubated at 37°C for 24h. After 24 h the strain was scraped off. The agar was flooded with 1 mg/ml Congo Red solution for 1h. Congo Red solution was poured off into a toxic waste bottle and 1 M NaCl was added and left for another 1 h. Then NaCl solution was poured off. Cellulases can cut CMC-Na into short chains. As Congo Red only binds to long chain polysaccharides but not short chain which therefore are washed off during staining procedure resulting in halo formation . The results are shown in Fig. 1.
The strains carrying cenA showed a zone of clearance created by hydrolysis of CMC. The empty vector control didn't show any zone of clearance around the colonies. The results showed that cenA gene can successfully works in BL21(DE3).
Endoglucanase activity assay
In addition, we measured the release of reducing sugar from CMC-Na with the 3,5-dinitrosalicylic acid (DNS) method for endoglucanase activity .
As shown in Fig. 2, BL21(DE3) carrying cenA gene could decompose CMC-Na while negative control couldn't, which proved that cenA could work successfully.
 Lakhundi, S. S. (2012). Synthetic biology approach to cellulose degradation.
 Wood TM & Bhat KM. 1988. Methods for measuring cellulase activities. Methods in Enzymology, 160: 87-112.
- Group: iGEM Team CAU-China 2019
- Author: Siwen Liang and Xueshan Yan
We improved this part by fusing with INP-N ( New part BBa_K3279008), the INP-N fused endoglucanase (INPN-CenA) can anchor in the cell membrane and function for surface display. The fusion protein was expressed and confirmed by SDS-PAGE, and the anchoring effect is measured through immunofluorescence staining and enzyme activity assay.For more details please see the Experience page of this part.
Group: SYSU-CHINA 2021
Author: Zhao Bingnan
Summary: 3D structure predicted by swiss-model;codon-optimized cenA
We also create a codon-optimized new part to improve the expression efficiency of the cenA, whose registry number is BBa_K3960013.For more information,please visit the main page.