Download MendeleyCrystal structure and function of C-terminal Sau3AI domain
Xu, C.Y., Yu, F., Xu, S.J., Ding, Y., Sun, L.H., Tang, L., Hu, X.J., Zhang, Z.H., He, J.H.(2009) Biochim Biophys Acta 1794: 118-123
- PubMed: 18930848
- DOI: https://doi.org/10.1016/j.bbapap.2008.09.008
- Primary Citation of Related Structures:
2REU - PubMed Abstract:
Sau3AI is a type II restriction enzyme that recognizes the 5'-GATC-3' sequence in double-strand DNA and cleaves at 5' to the G residue. The C-terminal domain of Sau3AI (Sau3AI-C), which contains amino acids from 233 to 489, was crystallized and its structure was solved by using the Multi-wavelength Anomalous Diffraction method. The Sau3AI-C structure at 1.9 A resolution is similar to the structure of MutH, a DNA mismatch repair protein that shares high sequence similarity with the N-terminal Sau3AI domain. The functional analysis shows that Sau3AI-C can bind DNA with one recognition sequence but has no cleavage activity. These results indicate that Sau3AI is a pseudo-dimer belonging to the type IIe restriction enzymes and the Sau3AI-C is the allosteric effector domain that assists DNA binding and cleavage.
Organizational Affiliation:
Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China.
