8de2

From Proteopedia

TEM-1 beta-lactamase A237Y mutant covalently bound to avibactam, a room temperature structure

Structural highlights

8de2 is a 4 chain structure with sequence from Escherichia coli. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:	X-ray diffraction, Resolution 2.45Å
Ligands:
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

BLAT_ECOLX TEM-type are the most prevalent beta-lactamases in enterobacteria; they hydrolyze the beta-lactam bond in susceptible beta-lactam antibiotics, thus conferring resistance to penicillins and cephalosporins. TEM-3 and TEM-4 are capable of hydrolyzing cefotaxime and ceftazidime. TEM-5 is capable of hydrolyzing ceftazidime. TEM-6 is capable of hydrolyzing ceftazidime and aztreonam. TEM-8/CAZ-2, TEM-16/CAZ-7 and TEM-24/CAZ-6 are markedly active against ceftazidime. IRT-4 shows resistance to beta-lactamase inhibitors.

Publication Abstract from PubMed

The widespread design of covalent drugs has focused on crafting reactive groups of proper electrophilicity and positioning toward targeted amino-acid nucleophiles. We found that environmental electric fields projected onto a reactive chemical bond, an overlooked design element, play essential roles in the covalent inhibition of TEM-1 beta-lactamase by avibactam. Using the vibrational Stark effect, the magnitudes of the electric fields that are exerted by TEM active sites onto avibactam's reactive C horizontal lineO were measured and demonstrate an electrostatic gating effect that promotes bond formation yet relatively suppresses the reverse dissociation. These results suggest new principles of covalent drug design and off-target site prediction. Unlike shape and electrostatic complementary which address binding constants, electrostatic catalysis drives reaction rates, essential for covalent inhibition, and deepens our understanding of chemical reactivity, selectivity, and stability in complex systems.

Protein Electric Fields Enable Faster and Longer-Lasting Covalent Inhibition of beta-Lactamases.,Ji Z, Kozuch J, Mathews II, Diercks CS, Shamsudin Y, Schulz MA, Boxer SG J Am Chem Soc. 2022 Nov 16;144(45):20947-20954. doi: 10.1021/jacs.2c09876. Epub , 2022 Nov 2. PMID:36324090^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Ji Z, Kozuch J, Mathews II, Diercks CS, Shamsudin Y, Schulz MA, Boxer SG. Protein Electric Fields Enable Faster and Longer-Lasting Covalent Inhibition of β-Lactamases. J Am Chem Soc. 2022 Nov 16;144(45):20947-20954. PMID:36324090 doi:10.1021/jacs.2c09876