1CI8 | pdb_00001ci8

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d1ci8a_	Multi-domain proteins (alpha and beta)	beta-lactamase/transpeptidase-like	beta-lactamase/transpeptidase-like	beta-Lactamase/D-ala carboxypeptidase	Esterase EstB	(Burkholderia gladioli ) [TaxId: 28095 ],	SCOPe (2.08)
B	d1ci8b_	Multi-domain proteins (alpha and beta)	beta-lactamase/transpeptidase-like	beta-lactamase/transpeptidase-like	beta-Lactamase/D-ala carboxypeptidase	Esterase EstB	(Burkholderia gladioli ) [TaxId: 28095 ],	SCOPe (2.08)

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	beta-lactamase/transpeptidase-like	8035501	3001604	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	beta-lactamase/transpeptidase-like	8035501	3001604	SCOP2B (2022-06-29)

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	Ion_trans_2	e1ci8A1	A: a/b three-layered sandwiches	X: ETN0001 domain-like	H: Rpp14/Pop5-like	T: Rpp14/Pop5-like	F: Ion_trans_2	ECOD (v294.1)
A	Transpeptidase	e1ci8A2	A: a/b three-layered sandwiches	X: ETN0001 domain-like	H: ETN0001 domain-like	T: Mss4-like	F: Transpeptidase	ECOD (v294.1)
B	Ion_trans_2	e1ci8B1	A: a/b three-layered sandwiches	X: ETN0001 domain-like	H: Rpp14/Pop5-like	T: Rpp14/Pop5-like	F: Ion_trans_2	ECOD (v294.1)
B	Transpeptidase	e1ci8B2	A: a/b three-layered sandwiches	X: ETN0001 domain-like	H: ETN0001 domain-like	T: Mss4-like	F: Transpeptidase	ECOD (v294.1)

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	3.40.710.10	Alpha Beta	3-Layer(aba) Sandwich	Beta-lactamase	DD-peptidase/beta-lactamase superfamily	CATH (4.3.0)
B	3.40.710.10	Alpha Beta	3-Layer(aba) Sandwich	Beta-lactamase	DD-peptidase/beta-lactamase superfamily	CATH (4.3.0)

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	PROTEIN (CARBOXYLESTERASE)	hydrolase activity catalytic activity	-	cellular anatomical structure intracellular anatomical structure cytoplasm

Chains	Accession	Name	Type
A, B	IPR001466	Beta-lactamase-related	Domain
A, B	IPR012338	Beta-lactamase/transpeptidase-like	Homologous Superfamily
A, B	IPR050789	Diverse Enzymatic Activities	Family
A, B	IPR023650	Beta-lactamase, class-A active site	Active Site

Chains	Enzyme Name	Description	Catalytic Residues
A	fusarinine-C ornithinesterase M-CSA #466	EstB is an esterase from Burkholderia gladioli whose physiological function is the hydrolysis of an N5-acyl-L-ornithine ester with moderate S-enantioselectivity. It is also known to act on short-chain (C4-C6) fatty acid esters and triglycerides, including tertiary alcohol esters (e.g. linalyl acetate). It also shows activity on p-nitrophenyl esters is generally higher than on o-nitrophenyl esters. The Burkholderia gladioli protein is known to be strongly inhibited by eserin, NaF, HgCl2, SDS and Triton X-100. The primary structure exhibits homology to esterases from family VIII, which are related to class C beta-lactamases. However, catalytic activity is located within the 'beta-lactamase' motif and not the 'esterase' motif. Despite structural similarity with peptidases and class C beta-lactamases, EstB shows no activity with peptides or beta-lactamases.	Defined by 10 residues: SER:A-75LYS:A-78TYR:A-133LEU:A-135ILE:A-152TYR:A-181ASP:A-186HIS:A-253TRP:A-348VAL:A-351 \| Explore in 3D: M-CSA Motif Definition Search M-CSA Motif EC: 3.1.1.1 (PDB Primary Data) Search M-CSA Motif + EC 3.1.1.1 EC: 3.1.1 (UniProt) Search M-CSA Motif + EC 3.1.1

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729. RCSB PDB uses resources of the National Energy Research Scientific Computing Center (NERSC), a Department of Energy User Facility.