1LBA

THE STRUCTURE OF BACTERIOPHAGE T7 LYSOZYME, A ZINC AMIDASE AND AN INHIBITOR OF T7 RNA POLYMERASE

External Resource: Annotation

Domain Annotation: SCOP/SCOPe Classification
Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
Domain Annotation: CATH
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Structure Motif: Primary M-CSA Annotation

Domain Annotation: SCOP/SCOPe Classification SCOP-e Database Homepage

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d1lbaa_	Alpha and beta proteins (a+b)	N-acetylmuramoyl-L-alanine amidase-like	N-acetylmuramoyl-L-alanine amidase-like	N-acetylmuramoyl-L-alanine amidase-like	Bacteriophage T7 lysozyme (Zn amidase)	(Escherichia phage T7 ) [TaxId: 10760 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2 Family	N-acetylmuramoyl-L-alanine amidase-like	8023783	4001915	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	N-acetylmuramoyl-L-alanine amidase-like	8036163	3000555	SCOP2 (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	Amidase_2	e1lbaA1	A: a+b three layers	X: N-acetylmuramoyl-L-alanine amidase-like (From Topology)	H: N-acetylmuramoyl-L-alanine amidase-like (From Topology)	T: N-acetylmuramoyl-L-alanine amidase-like	F: Amidase_2	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	3.40.80.10	Alpha Beta	3-Layer(aba) Sandwich	Lysozyme-like	Peptidoglycan recognition protein-like	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF01510	N-acetylmuramoyl-L-alanine amidase (Amidase_2)	N-acetylmuramoyl-L-alanine amidase	This family includes zinc amidases that have N-acetylmuramoyl-L-alanine amidase activity EC:3.5.1.28. This enzyme domain cleaves the amide bond between N-acetylmuramoyl and L-amino acids in bacterial cell walls (preferentially: D-lactyl-L-Ala). The ...	This family includes zinc amidases that have N-acetylmuramoyl-L-alanine amidase activity EC:3.5.1.28. This enzyme domain cleaves the amide bond between N-acetylmuramoyl and L-amino acids in bacterial cell walls (preferentially: D-lactyl-L-Ala). The structure is known for the bacteriophage T7 structure and shows that two of the conserved histidines are zinc binding.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	T7 LYSOZYME	cation binding transition metal ion binding zinc ion binding ion binding binding metal ion binding small molecule binding peptidoglycan muralytic activity hydrolase activity, acting on carbon-nitrogen (but not peptide) bonds, in linear amides hydrolase activity catalytic activity N-acetylmuramoyl-L-alanine amidase activity hydrolase activity, acting on carbon-nitrogen (but not peptide) bonds	biological process involved in interspecies interaction between organisms response to stimulus response to other organism defense response response to external stimulus response to biotic stimulus defense response to bacterium defense response to other organism response to stress response to bacterium response to external biotic stimulus carbohydrate derivative catabolic process catabolic process peptidoglycan catabolic process biological process involved in interspecies interaction between organisms response to stimulus response to other organism defense response response to external stimulus response to biotic stimulus defense response to bacterium defense response to other organism response to stress response to bacterium response to external biotic stimulus carbohydrate derivative catabolic process catabolic process peptidoglycan catabolic process glycosaminoglycan metabolic process carbohydrate derivative metabolic process aminoglycan catabolic process macromolecule catabolic process glycosaminoglycan catabolic process aminoglycan metabolic process peptidoglycan metabolic process metabolic process cellular process macromolecule metabolic process viral gene expression regulation of biological process regulation of viral process negative regulation of viral process regulation of viral transcription negative regulation of viral transcription viral process biological regulation negative regulation of biological process viral transcription symbiont-mediated cytolysis of host cell viral life cycle disruption of cell in another organism cytolysis biological process involved in interaction with host biological process involved in symbiotic interaction viral release from host cell by cytolysis disruption of cellular anatomical structure in another organism exit from host cell cytolysis in another organism viral release from host cell disruption of anatomical structure in another organism symbiont-mediated killing of host cell killing of cells of another organism cell killing disruption of plasma membrane integrity in another organism	host cellular component host intracellular part cellular anatomical structure host cell cytoplasm host cell part host intracellular region

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR002502	N-acetylmuramoyl-L-alanine amidase domain	Domain
A	IPR006619	Peptidoglycan recognition protein family domain, metazoa/bacteria	Domain
A	IPR036505	N-acetylmuramoyl-L-alanine amidase/PGRP domain superfamily	Homologous Superfamily
A	IPR015510	Peptidoglycan recognition protein	Family
A	IPR034689	Endolysin T7 type	Family

Structure Motif Annotation: Mechanism and Catalytic Site Atlas M-CSA Database Homepage

Chains	Enzyme Name	Description	Catalytic Residues
A	N-acetylmuramoyl-L-alanine amidase M-CSA #586	T7 lysosome is a bifunctional protein found only in T7 phage. It has amidase activity in cleaving the amide bond between N-acetyl-muramic acid and L-alanine in the bacterial cell wall. It also acts as an inhibitor of T7 RNA polymerase, which provides a feedback mechanism that shuts off late transcription during infection and stimulates DNA replication. T7 lysosyme differs from the previously well-studied egg-white and phage T4 lysosymes not only in having an interaction with T7 RNA polymerase but also in the chemistry of lysis: it cuts the amide bond between N-acetylmuramic acid and L-alanine rather than the glycosidic bond between N-acetylmuramic acid and N-acetylglucosamine in the peptidoglycan layer of bacterial cell walls.	Defined by 5 residues: HIS:A-13 [auth A-17]TYR:A-42 [auth A-46]HIS:A-118 [auth A-122]LYS:A-124 [auth A-128]CYS:A-126 [auth A-130] \| Explore in 3D: M-CSA Motif Definition Search M-CSA Motif EC: 3.5.1.28 (PDB Primary Data) Search M-CSA Motif + EC 3.5.1.28

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.