7UBL | pdb_00007ubl

Transcription antitermination factor Qlambda in complex with Q-lambda-binding-element DNA


Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

ChainsTypeFamily Name Domain Identifier Family IdentifierProvenance Source (Version)
ASCOP2B SuperfamilyDnaJ/Hsp40 cysteine-rich domain-like 8102245 3001550 SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

ChainsFamily NameDomain Identifier ArchitecturePossible HomologyHomologyTopologyFamilyProvenance Source (Version)
AAntiterme7ublA1 A: alpha arraysX: Antitermination protein Q helical domain (From Topology)H: Antitermination protein Q helical domain (From Topology)T: Antitermination protein Q helical domainF: AntitermECOD (1.6)
AAntiterm_likee7ublA2 A: few secondary structure elementsX: DnaJ/Hsp40 cysteine-rich domain (From Topology)H: DnaJ/Hsp40 cysteine-rich domain (From Topology)T: DnaJ/Hsp40 cysteine-rich domainF: Antiterm_likeECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

ChainDomainClassArchitectureTopologyHomologyProvenance Source (Version)
A1.10.274.110 Mainly Alpha Orthogonal Bundle Enzyme I Chain A, domain 2CATH (utative)

Protein Family Annotation Pfam Database Homepage

ChainsAccessionNameDescriptionCommentsSource
PF03589Antitermination protein Q (Antiterm)Antitermination protein QThis entry consists of antitermination proteins found in bacteriophages, such as protein Q from phage lambda, and some bacterial homologues. Protein Q positively regulates expression of the phage late gene operon by binding to the bacterial host RNA ...This entry consists of antitermination proteins found in bacteriophages, such as protein Q from phage lambda, and some bacterial homologues. Protein Q positively regulates expression of the phage late gene operon by binding to the bacterial host RNA polymerase (RNAP) and modifying it. This protein binds a specific DNA Q-binding element (QBE) and interacts with RNAP. The modified RNAP can read without pausing and through transcription terminators preceding late genes [1,2]. It participates in the lysis-lysogeny decision by activating the expression of the late lytic genes [3]. The structure of Q from bacteriophage 21 revealed that it forms a torus, that narrows and extends the RNAP RNA-exit channel and extrudes the linked RNA, preventing the formation of pause and terminator hairpins [2].
Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

ChainsPolymerMolecular FunctionBiological ProcessCellular Component
Antitermination protein Q -
DNA (5'-D(P*CP*AP*CP*CP*CP*AP*AP*TP*TP*TP*TP*AP*TP*TP*CP*AP*AP*TP*G)-3')---
DNA (5'-D(P*CP*AP*TP*TP*GP*AP*AP*TP*AP*AP*AP*AP*TP*TP*GP*GP*GP*TP*G)-3')---

InterPro: Protein Family Classification InterPro Database Homepage