Solution structure of the albumin-binding GA module: a versatile bacterial protein domain
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Solution structure of the albumin-binding GA module : a versatile bacterial protein domain. / Johansson, Mai-Britt; de Château, M; Wikström, M; Forsén, S; Drakenberg, T; Björck, L.
In: Journal of Molecular Biology, Vol. 266, No. 5, 14.03.1997, p. 859-65.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Solution structure of the albumin-binding GA module
T2 - a versatile bacterial protein domain
AU - Johansson, Mai-Britt
AU - de Château, M
AU - Wikström, M
AU - Forsén, S
AU - Drakenberg, T
AU - Björck, L
PY - 1997/3/14
Y1 - 1997/3/14
N2 - The albumin-binding GA module is found in a family of surface proteins of different bacterial species. It comprises 45 amino acid residues and represents the first known example of contemporary module shuffling. Using 1H NMR spectroscopy we have determined the solution structure of the GA module from protein PAB, a protein of the anaerobic human commensal and pathogen Peptostreptococcus magnus. This structure, the first three-dimensional structure of an albumin-binding protein domain described, was shown to be composed of a left-handed three-helix-bundle. Sequence differences between GA modules with different affinities for albumin indicated that a conserved region in the C-terminal part of the second helix and the flexible sequence between helices 2 and 3 could contribute to the albumin-binding activity. The effect on backbone amide proton exchange rates upon binding to albumin support this assumption. The GA module has a fold that is strikingly similar to the immunoglobulin-binding domains of staphylococcal protein A but it shows no resemblance to the fold shared by the immunoglobulin-binding domains of streptococcal protein G and peptostreptococcal protein L. When the gene sequences, binding properties and thermal stability of these four domains are analysed in relation to their global folds an evolutionary pattern emerges. Thus, in the evolution of novel binding properties mutations are allowed only as long as the energetically favourable global fold is maintained.
AB - The albumin-binding GA module is found in a family of surface proteins of different bacterial species. It comprises 45 amino acid residues and represents the first known example of contemporary module shuffling. Using 1H NMR spectroscopy we have determined the solution structure of the GA module from protein PAB, a protein of the anaerobic human commensal and pathogen Peptostreptococcus magnus. This structure, the first three-dimensional structure of an albumin-binding protein domain described, was shown to be composed of a left-handed three-helix-bundle. Sequence differences between GA modules with different affinities for albumin indicated that a conserved region in the C-terminal part of the second helix and the flexible sequence between helices 2 and 3 could contribute to the albumin-binding activity. The effect on backbone amide proton exchange rates upon binding to albumin support this assumption. The GA module has a fold that is strikingly similar to the immunoglobulin-binding domains of staphylococcal protein A but it shows no resemblance to the fold shared by the immunoglobulin-binding domains of streptococcal protein G and peptostreptococcal protein L. When the gene sequences, binding properties and thermal stability of these four domains are analysed in relation to their global folds an evolutionary pattern emerges. Thus, in the evolution of novel binding properties mutations are allowed only as long as the energetically favourable global fold is maintained.
KW - Amino Acid Sequence
KW - Bacterial Proteins
KW - Binding Sites
KW - Biological Evolution
KW - Carrier Proteins
KW - Cell Wall
KW - Conserved Sequence
KW - Deuterium
KW - Magnetic Resonance Spectroscopy
KW - Models, Molecular
KW - Molecular Sequence Data
KW - Peptide Fragments
KW - Protein Binding
KW - Protein Structure, Tertiary
KW - Recombination, Genetic
KW - Sequence Homology, Amino Acid
KW - Serum Albumin
KW - Solutions
KW - Staphylococcal Protein A
U2 - 10.1006/jmbi.1996.0856
DO - 10.1006/jmbi.1996.0856
M3 - Journal article
C2 - 9086265
VL - 266
SP - 859
EP - 865
JO - Journal of Molecular Biology
JF - Journal of Molecular Biology
SN - 0022-2836
IS - 5
ER -
ID: 50253401