1AA7

INFLUENZA VIRUS MATRIX PROTEIN CRYSTAL STRUCTURE AT PH 4.0

PDB DOI: https://doi.org/10.2210/pdb1AA7/pdb

Classification: MATRIX PROTEIN
Organism(s): unidentified influenza virus
Mutation(s): No
Membrane Protein: Yes OPM

Deposited: 1997-01-24 Released: 1998-01-28
Deposition Author(s): Sha, B., Luo, M.

Experimental Data Snapshot

Method: X-RAY DIFFRACTION
Resolution: 2.08 Å
R-Value Free: 0.280
R-Value Work: 0.208
R-Value Observed: 0.208

wwPDB Validation 3D Report Full Report

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

Literature

Structure of a bifunctional membrane-RNA binding protein, influenza virus matrix protein M1.

Sha, B., Luo, M.

(1997) Nat Struct Biol 4: 239-244

PubMed: 9164466 Search on PubMed
DOI: https://doi.org/10.1038/nsb0397-239
Primary Citation of Related Structures:
1AA7

PubMed Abstract:
Matrix protein (M1) of influenza virus is a bifunctional protein that mediates the encapsidation of RNA-nucleoprotein cores into the membrane envelope. It is therefore required that M1 binds both membrane and RNA simultaneously. The X-ray crystal structure of the N-terminal portion of type A influenza virus M1-amino acid residues 2-158-has been determined at 2.08 A resolution at pH 4.0. The protein forms a dimer. A highly positively charged region on the dimer surface is suitably positioned to bind RNA while the hydrophobic surface opposite the RNA binding region may be involved in interactions with the membrane. The membrane-binding hydrophobic surface could be buried or exposed after a conformational change.

Organizational Affiliation

Department of Microbiology, University of Alabama at Birmingham 35294, USA.

Macromolecule Content

Total Structure Weight: 34.8 kDa
Atom Count: 2,514
Modelled Residue Count: 315
Deposited Residue Count: 316
Unique protein chains: 1

Macromolecules

Find similar proteins by:

(by identity cutoff) | 3D Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
INFLUENZA VIRUS MATRIX PROTEIN	A, B	158	unidentified influenza virus	Mutation(s): 0 Membrane Entity: Yes
UniProt
Find proteins for P03485 (Influenza A virus (strain A/Puerto Rico/8/1934 H1N1)) Explore P03485 Go to UniProtKB: P03485
Entity Groups
Sequence Clusters	30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt Group	P03485
Sequence Annotations Expand
Reference Sequence

Experimental Data & Validation

Experimental Data

Method: X-RAY DIFFRACTION
Resolution: 2.08 Å
R-Value Free: 0.280
R-Value Work: 0.208
R-Value Observed: 0.208
Space Group: P 3₁ 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 66.17	α = 90
b = 66.17	β = 90
c = 135.3	γ = 120

Software Package:

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

Structure Validation

View Full Validation Report

Entry History

Deposition Data

Released Date: 1998-01-28

Deposition Author(s):

Revision History (Full details and data files)

Version 1.0: 1998-01-28
Type: Initial release
Version 1.1: 2008-03-24
Changes: Version format compliance
Version 1.2: 2011-07-13
Changes: Version format compliance
Version 1.3: 2024-02-07
Changes: Data collection, Database references

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.