1SIG | pdb_00001sig

CRYSTAL STRUCTURE OF A SIGMA70 SUBUNIT FRAGMENT FROM ESCHERICHIA COLI RNA POLYMERASE

PDB DOI: https://doi.org/10.2210/pdb1SIG/pdb

Classification: TRANSCRIPTION REGULATION
Organism(s): Escherichia coli K-12
Expression System: Escherichia coli BL21(DE3)
Mutation(s): No

Deposited: 1997-02-18 Released: 1997-05-15
Deposition Author(s): Malhotra, A., Severinova, E., Darst, S.A.

Experimental Data Snapshot

Method: X-RAY DIFFRACTION
Resolution: 2.60 Å
R-Value Free:
0.315 (Depositor)
R-Value Work:
0.218 (Depositor), 0.223 (DCC)
R-Value Observed:
0.218 (Depositor)

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This is version 1.3 of the entry. See complete history.

Literature

Crystal structure of a sigma 70 subunit fragment from E. coli RNA polymerase.

Malhotra, A., Severinova, E., Darst, S.A.

(1996) Cell 87: 127-136

PubMed: 8858155 Search on PubMed
DOI: https://doi.org/10.1016/s0092-8674(00)81329-x
Primary Citation Related Structures:
1SIG

PubMed Abstract:
The 2.6 A crystal structure of a fragment of the sigma 70 promoter specificity subunit of E. coli RNA polymerase is described. Residues involved in core RNA polymerase binding lie on one face of the structure. On the opposite face, aligned along one helix, are exposed residues that interact with the -10 consensus promoter element (the Pribnow box), including four aromatic residues involved in promoter melting. The structure suggests one way in which DNA interactions may be inhibited in the absence of RNA polymerase and provides a framework for the interpretation of a large number of genetic and biochemical analyses.

Organizational Affiliation

Rockefeller University, New York, New York 10021, USA.

Macromolecule Content

Total Structure Weight: 39.09 kDa
Atom Count: 2,593
Modeled Residue Count: 305
Deposited Residue Count: 339
Unique protein chains: 1

Macromolecules

Find similar proteins by:

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
RNA POLYMERASE PRIMARY SIGMA FACTOR	A	339	Escherichia coli K-12	Mutation(s): 0 Gene Names: RPOD
UniProt
Find proteins for P00579 (Escherichia coli (strain K12)) Explore P00579 Go to UniProtKB: P00579
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	P00579
Sequence Annotations Expand
Reference Sequence

Experimental Data & Validation

Experimental Data

Method: X-RAY DIFFRACTION
Resolution: 2.60 Å
R-Value Free: 0.315 (Depositor)
R-Value Work: 0.218 (Depositor), 0.223 (DCC)
R-Value Observed: 0.218 (Depositor)

Space Group: P 4₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 79.229	α = 90
b = 79.229	β = 90
c = 134.06	γ = 90

Software Package:

Software Name	Purpose
MLPHARE	phasing
X-PLOR	refinement
DENZO	data reduction
SCALEPACK	data scaling

Structure Validation

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Entry History

Deposition Data

Released Date: 1997-05-15

Deposition Author(s):

Revision History (Full details and data files)

Version 1.0: 1997-05-15
Type: Initial release
Version 1.1: 2008-03-24
Changes: Version format compliance
Version 1.2: 2011-07-13
Changes: Source and taxonomy, Version format compliance
Version 1.3: 2024-02-14
Changes: Data collection, Database references

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