Common structural framework of the two calcium/magnesium binding loops of troponin C and other calcium binding proteins

Biochemistry ◽  
1985 ◽  
Vol 24 (20) ◽  
pp. 5298-5302 ◽  
Author(s):  
Osnat Herzberg ◽  
Michael N. G. James
Keyword(s):  
Calcium Binding ◽  
Binding Proteins ◽  
Troponin C ◽  
Calcium Binding Proteins ◽  
Structural Framework ◽  
Magnesium Binding ◽  
Calcium Magnesium

Calcium binding proteins. Elucidating the contributions to calcium affinity from an analysis of species variants and peptide fragments

1990 ◽  
Vol 68 (3) ◽  
pp. 587-601 ◽  
Author(s):  
Brian J. Marsden ◽  
Gary S. Shaw ◽  
Brian D. Sykes
Keyword(s):  
Binding Affinity ◽  
Sequence Homology ◽  
Calcium Binding ◽  
Binding Proteins ◽  
Troponin C ◽  
Calcium Binding Proteins ◽  
Intact Protein ◽  
Peptide Fragments ◽  
Helix Loop Helix ◽  
Calcium Affinity

This paper describes the sequence homology of calcium-binding proteins belonging to the troponin C superfamily. Specifically, this similarity has been examined for 276 twelve-residue calcium-binding loops. It has been found that, in the calcium-binding loop, several residues appear invariant, regardless of the species of origin or the affinity of the protein. These residues are Asp at position 1 (+ X of the coordinating position of the calcium), Asp or Asn at position 3 (+ Y), Gly at position 6, Ile at position 8, and Glu at position 12 (− Z). It has also been found that conservation of certain residues can vary in similar sites in similar proteins. For example, position 3 (+ Y) in site 3 of troponin C is always an Asn, whereas in calmodulin the residue is always Asp. This study also examined the calcium-binding affinities of peptide fragments comprising the loop, helix–loop, loop–helix, and helix–loop–helix. These were compared with larger enzymatic or chemically generated protein fragments in an effort to understand the various contributions to the calcium-binding affinity of a single-site versus a two-site domain as found in troponin C and calmodulin. Based on free energy differences, it was found that a 34-residue helix–loop–helix peptide represents about 60% of the binding affinity found in the intact protein. Cooperativity with a second calcium binding site accounted for the remaining 40% of the affinity.Key words: calcium-binding proteins, sequence homology, peptide fragments, species variants, calcium affinity.

Troponin C and calcium dependent regulator protein, two ancestral skeletal muscle calcium binding proteins

Biosystems ◽  
1980 ◽  
Vol 12 (3-4) ◽  
pp. 317-323 ◽  
Author(s):  
L.M.G. Heilmeyer ◽  
U. Jahnke ◽  
M.W. Kilimann ◽  
K.P. Kohse ◽  
J.E. Sperling ◽  
...  
Keyword(s):  
Skeletal Muscle ◽  
Calcium Binding ◽  
Binding Proteins ◽  
Troponin C ◽  
Calcium Binding Proteins ◽  
Calcium Dependent ◽  
Regulator Protein ◽  
Muscle Calcium

scholarly journals 113 Cd NMR in the study of calcium binding proteins: Troponin C

FEBS Letters ◽  
1979 ◽  
Vol 104 (1) ◽  
pp. 123-126 ◽  
Author(s):  
Sture Forsén ◽  
Eva Thulin ◽  
Hans Lilja
Keyword(s):  
Calcium Binding ◽  
Binding Proteins ◽  
Troponin C ◽  
Calcium Binding Proteins

How Important are S100A8/S100A9 Calcium Binding Proteins for the Activation of Phagocyte NADPH Oxidase, Nox2

2009 ◽  
Vol 8 (4) ◽  
pp. 282-289 ◽  
Author(s):  
Sylvie Berthier ◽  
Athan Baillet ◽  
Marie-Helene Paclet ◽  
Philippe Gaudin ◽  
Francoise Morel
Keyword(s):  
Nadph Oxidase ◽  
Calcium Binding ◽  
Binding Proteins ◽  
Calcium Binding Proteins ◽  
Phagocyte Nadph Oxidase
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