6K1L

E53A mutant of a putative cystathionine gamma-lyase

Summary for 6K1L

• Entry DOI: 10.2210/pdb6k1l/pdb
• Descriptor: Cystathionine gamma-lyase, PYRIDOXAL-5'-PHOSPHATE, PYRUVIC ACID, ... (4 entities in total)
• Functional Keywords: cse, cgl, biomineralization, quantum dots, cds, biosynthetic protein, lyase
• Biological source: Stenotrophomonas maltophilia (strain R551-3)
• Total number of polymer chains: 4
• Total formula weight: 167742.76

Authors

Chen, S.,Wang, Y. (deposition date: 2019-05-10, release date: 2020-05-13, Last modification date: 2023-11-22)

Primary citation

Wang, Y.,Chen, H.,Huang, Z.,Yang, M.,Yu, H.,Peng, M.,Yang, Z.,Chen, S.
Structural characterization of cystathionine gamma-lyase smCSE enables aqueous metal quantum dot biosynthesis.
Int.J.Biol.Macromol., 174:42-51, 2021

PubMed Abstract: The development and utilization of inorganic material biosynthesis have evolved into single macromolecular systems. A putative cystathionine γ-lyase of bacteria Stenotrophomonas maltophilia (smCSE) is a newly identified biomolecule that enables the synthesis of nanomaterials. Due to the lack of structural information, the mechanism of smCSE biosynthesis remains unclear. Herein, we obtain two atomic-resolution smCSE-form X-ray structures and confirm that the conformational changes of Tyr108 and Lys206 within the enzyme active sites are critical for the protein-driven synthesis of metal sulfide quantum dots (QDs). The structural stability of tetramer and the specificity of surface amino acids are the basis for smCSE to synthesize quantum dots. The size of QD products can be regulated by predesigned amino acids and the morphology can be controlled through proteolytic treatments. The growth rate is enhanced by the stabilization of a flexible loop in the active site, as shown by the X-ray structure of the engineered protein which fused with a dodecapeptide. We further prove that the smCSE-driven route can be applied to the general synthesis of other metal sulfide nanoparticles. These results provide a better understanding of the mechanism of QD biosynthesis and a new perspective on the control of this biosynthesis by protein modification.

PubMed: 33497694
DOI: 10.1016/j.ijbiomac.2021.01.141

Experimental method

X-RAY DIFFRACTION (2.46 Å)