Related ArticlesVal(659)-->Glu mutation within the transmembrane domain of ErbB-2: effects measured by (2)H NMR in fluid phospholipid bilayers.
Biochemistry. 2000 May 30;39(21):6572-80
Authors: Sharpe S, Barber KR, Grant CW
Certain point mutations within the hydrophobic transmembrane domains of class I receptor tyrosine kinases have been associated with oncogenic transformation in vitro and in vivo [Gullick, J., and Srinivasan, R. (1998) Breast Cancer Res. Treat. 52, 43-53]. An important example is the replacement of a single (hydrophobic) valine by (charged) glutamate in the rat protein, Neu, and in the homologous human protein, ErbB-2. It has been suggested that the oncogenic nature of this Val-->Glu substitution may derive from alteration of the transmembrane domain's ability to take part in direct side-to-side associations. In the present work, we examined the basis of this phenomenon by studying transmembrane portions of ErbB-2 in fluid bilayer membranes. An expression system was designed to produce such peptides from the wild-type ErbB-2, and from an identical region of the transforming mutant in which Val(659) is replaced by Glu. All peptides were 50-mers, containing the appropriate transmembrane domain plus contiguous stretches of amino acids from the cytoplasmic and extracellular domains. Deuterium heteronuclear probes were incorporated into alanine side chains (thus, each alanine -CH(3) side chain became -CD(3)). Given the presence of natural alanine residues at positions 648 and 657 within ErbB-2, this approach afforded heteronuclear probes within the motif Ser(656)AlaValValGlu(660), thought to be important for homodimer formation, and nine residues upstream of this site. Further peptides were produced, by site-directed mutagenesis, to confirm spectral assignments and to provide an additional probe location at position 670 (11 residues downstream of the motif region). On SDS-polyacrylamide gels, the transmembrane peptides migrated as predominant monomers in equilibrium with smaller populations of homodimers/-oligomers. CD spectra of both wild-type and transforming mutant peptides were consistent with the transmembrane portions being basically alpha-helical. (2)H NMR spectra of each transmembrane peptide were obtained in fluid phospholipid bilayers of 1-palmitoyl-2-oleoylphosphatidylcholine (POPC) from 35 to 65 degrees C. Results were consistent with the concept that the glutamic acid residue characterizing the mutant is uncharged at neutral pH. Narrowed spectral components from species rotating rapidly and symmetrically within the membrane appeared to represent monomeric peptide. Mutation of Val(659) to Glu within the hydrophobic domain induced changes in side chain angulation of at least 6-8 degrees at Ala(657) (i.e., within the five amino acid motif thought to be involved in homodimer formation), and downstream of this site to residue 670. There was little evidence of effect at the upstream site (Ala(648)) at the membrane surface. This result argues that the transforming mutation is associated with significant intramolecular rearrangement of the monomeric transmembrane helix-extending over some four helix turns-which could influence its lateral associations. In addition, temperature effects on spectral quadrupole splittings suggested that there is greater peptide backbone flexibility for the wild-type transmembrane region.
[NMR paper] 15N and 31P solid-state NMR study of transmembrane domain alignment of M2 protein of
15N and 31P solid-state NMR study of transmembrane domain alignment of M2 protein of influenza A virus in hydrated cylindrical lipid bilayers confined to anodic aluminum oxide nanopores.
Related Articles 15N and 31P solid-state NMR study of transmembrane domain alignment of M2 protein of influenza A virus in hydrated cylindrical lipid bilayers confined to anodic aluminum oxide nanopores.
J Magn Reson. 2005 Apr;173(2):322-7
Authors: Chekmenev EY, Hu J, Gor'kov PL, Brey WW, Cross TA, Ruuge A, Smirnov AI
This communication reports the first...
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[NMR paper] Folding and domain-domain interactions of the chaperone PapD measured by 19F NMR.
Folding and domain-domain interactions of the chaperone PapD measured by 19F NMR.
Related Articles Folding and domain-domain interactions of the chaperone PapD measured by 19F NMR.
Biochemistry. 2004 Nov 2;43(43):13775-86
Authors: Bann JG, Frieden C
The folding of the two-domain bacterial chaperone PapD has been studied to develop an understanding of the relationship between individual domain folding and the formation of domain-domain interactions. PapD contains six phenylalanine residues, four in the N-terminal domain and two in the...
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[NMR paper] Effects of remote mutation on the autolysis of HIV-1 PR: X-ray and NMR investigations
Effects of remote mutation on the autolysis of HIV-1 PR: X-ray and NMR investigations.
Related Articles Effects of remote mutation on the autolysis of HIV-1 PR: X-ray and NMR investigations.
Biochem Biophys Res Commun. 2002 Jun 7;294(2):395-401
Authors: Kumar M, Kannan KK, Hosur MV, Bhavesh NS, Chatterjee A, Mittal R, Hosur RV
Autolysis rates of the C95M and C95M/C1095A mutants of a HIV-1 protease tethered dimer have been determined by real time NMR and it is observed that the double mutant has approximately two times higher rate. X-ray...
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[NMR paper] Structure of outer membrane protein A transmembrane domain by NMR spectroscopy.
Structure of outer membrane protein A transmembrane domain by NMR spectroscopy.
Related Articles Structure of outer membrane protein A transmembrane domain by NMR spectroscopy.
Nat Struct Biol. 2001 Apr;8(4):334-8
Authors: Arora A, Abildgaard F, Bushweller JH, Tamm LK
We have determined the three-dimensional fold of the 19 kDa (177 residues) transmembrane domain of the outer membrane protein A of Escherichia coli in dodecylphosphocholine (DPC) micelles in solution using heteronuclear NMR. The structure consists of an eight-stranded beta-barrel...
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[NMR paper] Oligomerization of the EGF receptor transmembrane domain: a 2H NMR study in lipid bil
Oligomerization of the EGF receptor transmembrane domain: a 2H NMR study in lipid bilayers.
http://www.ncbi.nlm.nih.gov/corehtml/query/egifs/http:--pubs.acs.org-images-acspubs.jpg Related Articles Oligomerization of the EGF receptor transmembrane domain: a 2H NMR study in lipid bilayers.
Biochemistry. 1997 Oct 14;36(41):12616-24
Authors: Jones DH, Rigby AC, Barber KR, Grant CW
During the course of a previous study by wideline 2H NMR, we noted spectral features suggesting the possibility of monitoring homodimer/oligomer interactions between...
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[NMR paper] 13C NMR study of the effects of mutation on the tryptophan dynamics in chymotrypsin i
13C NMR study of the effects of mutation on the tryptophan dynamics in chymotrypsin inhibitor 2: correlations with structure and stability.
Related Articles 13C NMR study of the effects of mutation on the tryptophan dynamics in chymotrypsin inhibitor 2: correlations with structure and stability.
Biochemistry. 1993 Jan 19;32(2):657-62
Authors: Matthews SJ, Jandu SK, Leatherbarrow RJ
Recombinant chymotrypsin inhibitor 2 (CI-2) and the three mutants Ile39-->Val, Ile39-->Leu, and Arg67-->Ala were successfully enriched with tryptophan at position...
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[NMR paper] Solution structure and orientation of the transmembrane anchor domain of the HIV-1-en
Solution structure and orientation of the transmembrane anchor domain of the HIV-1-encoded virus protein U by high-resolution and solid-state NMR spectroscopy.
http://www.ncbi.nlm.nih.gov/corehtml/query/egifs/http:--pubs.acs.org-images-acspubs.jpg Related Articles Solution structure and orientation of the transmembrane anchor domain of the HIV-1-encoded virus protein U by high-resolution and solid-state NMR spectroscopy.
Biochemistry. 1999 Apr 20;38(16):5272-82
Authors: Wray V, Kinder R, Federau T, Henklein P, Bechinger B, Schubert U
The...