1PHO | pdb_00001pho

CRYSTAL STRUCTURES EXPLAIN FUNCTIONAL PROPERTIES OF TWO E. COLI PORINS

PDB DOI: https://doi.org/10.2210/pdb1PHO/pdb

Classification: OUTER MEMBRANE PROTEIN
Organism(s): Escherichia coli
Mutation(s): No
Membrane Protein: Yes OPM PDBTM MemProtMD mpstruc

Deposited: 1993-01-15 Released: 1993-10-31
Deposition Author(s): Schirmer, T., Cowan, S.W., Jansonius, J.N.

Experimental Data Snapshot

Method: X-RAY DIFFRACTION
Resolution: 3.00 Å
R-Value Work:
0.222 (Depositor)
R-Value Observed:
0.222 (Depositor)

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

Literature

Crystal structures explain functional properties of two E. coli porins.

Cowan, S.W., Schirmer, T., Rummel, G., Steiert, M., Ghosh, R., Pauptit, R.A., Jansonius, J.N., Rosenbusch, J.P.

(1992) Nature 358: 727-733

PubMed: 1380671 Search on PubMed
DOI: https://doi.org/10.1038/358727a0
Primary Citation Related Structures:
1PHO

PubMed Abstract:
Porins form aqueous channels that aid the diffusion of small hydrophilic molecules across the outer membrane of Gram-negative bacteria. The crystal structures of matrix porin and phosphoporin both reveal trimers of identical subunits, each subunit consisting of a 16-stranded anti-parallel beta-barrel containing a pore. A long loop inside the barrel contributes to a constriction of the channel where the charge distribution affects ion selectivity. The structures explain at the molecular level functional characteristics and their alterations by known mutations.

Organizational Affiliation

Department of Structural Biology, University of Basel, Switzerland.

Macromolecule Content

Total Structure Weight: 36.87 kDa
Atom Count: 2,602
Modeled Residue Count: 330
Deposited Residue Count: 330
Unique protein chains: 1

Macromolecules

Find similar proteins by:

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
PHOSPHOPORIN	A	330	Escherichia coli	Mutation(s): 0 Membrane Entity: Yes
UniProt
Find proteins for P02932 (Escherichia coli (strain K12)) Explore P02932 Go to UniProtKB: P02932
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	P02932
Sequence Annotations Expand
Reference Sequence

Experimental Data & Validation

Experimental Data

Method: X-RAY DIFFRACTION
Resolution: 3.00 Å
R-Value Work: 0.222 (Depositor)
R-Value Observed: 0.222 (Depositor)

Space Group: P 3 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 119.9	α = 90
b = 119.9	β = 90
c = 51.9	γ = 120

Software Package:

Software Name	Purpose
X-PLOR	model building
X-PLOR	refinement
X-PLOR	phasing

Structure Validation

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Entry History

Deposition Data

Released Date: 1993-10-31

Deposition Author(s):

Jansonius, J.N.

Revision History (Full details and data files)

Version 1.0: 1993-10-31
Type: Initial release
Version 1.1: 2008-03-24
Changes: Version format compliance
Version 1.2: 2011-07-13
Changes: Derived calculations, Version format compliance
Version 1.3: 2024-02-14
Changes: Data collection, Database references, Other

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