8R88

Structure of P107T BlaC from Mycobacterium tuberculosis

8R88 の概要

• エントリーDOI: 10.2210/pdb8r88/pdb
• 分子名称: Beta-lactamase, PHOSPHATE ION, GLYCEROL, ... (4 entities in total)
• 機能のキーワード: hydrolase
• 由来する生物種: Mycobacterium tuberculosis
• タンパク質・核酸の鎖数: 4
• 化学式量合計: 113860.87

構造登録者

Chikunova, A.,Ubbink, M. (登録日: 2023-11-28, 公開日: 2024-03-20, 最終更新日: 2024-04-10)

主引用文献

Chikunova, A.,Manley, M.P.,Heijjer, C.N.,Drenth, C.S.,Cramer-Blok, A.J.,Ahmad, M.U.D.,Perrakis, A.,Ubbink, M.
Conserved proline residues prevent dimerization and aggregation in the beta-lactamase BlaC.
Protein Sci., 33:e4972-e4972, 2024

PubMed Abstract: Evolution leads to conservation of amino acid residues in protein families. Conserved proline residues are usually considered to ensure the correct folding and to stabilize the three-dimensional structure. Surprisingly, proline residues that are highly conserved in class A β-lactamases were found to tolerate various substitutions without large losses in enzyme activity. We investigated the roles of three conserved prolines at positions 107, 226, and 258 in the β-lactamase BlaC from Mycobacterium tuberculosis and found that mutations can lead to dimerization of the enzyme and an overall less stable protein that is prone to aggregate over time. For the variant Pro107Thr, the crystal structure shows dimer formation resembling domain swapping. It is concluded that the proline substitutions loosen the structure, enhancing multimerization. Even though the enzyme does not lose its properties without the conserved proline residues, the prolines ensure the long-term structural integrity of the enzyme.

PubMed: 38533527
DOI: 10.1002/pro.4972

実験手法

X-RAY DIFFRACTION (1.95 Å)