6dv9

Crystal structure of Mycobacterium tuberculosis transcription initiation complex(ECF sigma factor L) containing 5nt RNA with 4nt spacer

spinqualitylabelsall models 6dv9, resolution 3.80Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6dv9 is a 9 chain structure with sequence from Myctu. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: MG, ZN Gene: rpoA, Rv3457c, MTCY13E12.10c (MYCTU), rpoB, Rv0667, MTCI376.08c (MYCTU), rpoC, Rv0668, MTCI376.07c (MYCTU), rpoZ, Rv1390, MTCY21B4.07 (MYCTU), sigL, Rv0735 (MYCTU) Activity: DNA-directed RNA polymerase, with EC number 2.7.7.6 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [RPOC_MYCTU] DNA-dependent RNA polymerase catalyzes the transcription of DNA into RNA using the four ribonucleoside triphosphates as substrates.[HAMAP-Rule:MF_01322] [RPOB_MYCTU] DNA-dependent RNA polymerase catalyzes the transcription of DNA into RNA using the four ribonucleoside triphosphates as substrates.[HAMAP-Rule:MF_01321] [RPOA_MYCTU] DNA-dependent RNA polymerase catalyzes the transcription of DNA into RNA using the four ribonucleoside triphosphates as substrates.[HAMAP-Rule:MF_00059] [RPOZ_MYCTU] Promotes RNA polymerase assembly. Latches the N- and C-terminal regions of the beta' subunit thereby facilitating its interaction with the beta and alpha subunits. [SIGL_MYCTU] Sigma factors are initiation factors that promote the attachment of RNA polymerase to specific initiation sites and are then released. Extracytoplasmic function (ECF) sigma factors are held in an inactive form by an anti-sigma factor until released by regulated intramembrane proteolysis. Over-expression of SigL induces 19-28 genes including polyketide synthases, secreted and membrane proteins. Might play a minor role in regulating SigB. Publication Abstract from PubMed Extracytoplasmic (ECF) sigma factors, the largest class of alternative sigma factors, are related to primary sigma factors, but have simpler structures, comprising only two of six conserved functional modules in primary sigma factors: region 2 (sigmaR2) and region 4 (sigmaR4). Here, we report crystal structures of transcription initiation complexes containing Mycobacterium tuberculosis RNA polymerase (RNAP), M. tuberculosis ECF sigma factor sigma(L), and promoter DNA. The structures show that sigmaR2 and sigmaR4 of the ECF sigma factor occupy the same sites on RNAP as in primary sigma factors, show that the connector between sigmaR2 and sigmaR4 of the ECF sigma factor-although shorter and unrelated in sequence-follows the same path through RNAP as in primary sigma factors, and show that the ECF sigma factor uses the same strategy to bind and unwind promoter DNA as primary sigma factors. The results define protein-protein and protein-DNA interactions involved in ECF-sigma-factor-dependent transcription initiation. Structural basis of ECF-sigma-factor-dependent transcription initiation.,Lin W, Mandal S, Degen D, Cho MS, Feng Y, Das K, Ebright RH Nat Commun. 2019 Feb 12;10(1):710. doi: 10.1038/s41467-019-08443-3. PMID:30755604 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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