Words similar to alanines
Example sentences for: alanines
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Substitution of the three threonines with alanines produces the 3 × Ala mutant that behaves like a constitutively unphosphorylated myosin-II.
All crystallographically characterized metallo-β-lactamases have a flexible amino acid chain that extends over the active site [ 37 42 44 45 46 47 48 49 ] . Previous NMR studies on CcrA have shown that this loop "clamps down" on substrate or inhibitor upon binding, and there is speculation that the distortion of substrate upon clamping down of the loop may drive catalysis [ 50 ] . The crystal structure of L1 showed that there is a large loop that extends over the active site, and modeling studies have predicted that two residues, Ile164 and Phe158, make significant contacts with large, hydrophobic substituents at the 2' or 6' positions on penicillins, cephalosporins, or carbapenems [ 37 ] . To test this prediction, Ile 164 and Phe158 were changed from large, hydrophobic residues to alanines to afford the I164A and F158A mutants.
A recent study identified a number of α5 helix residues in α t that when changed to alanines increased rates of guanine-nucleotide exchange ( i.e., decreased affinity for guanine-nucleotides) [ 5 ] . Individual mutation of amino acids in α t , cognate to T330, N332, V333, F337 in α i2 (Figure 1), increased nucleotide exchange rates [ 5 ] . Two of these critical amino acids, N332 and V333 in α i2 , are in fact the first two amino acids that are replaced by the novel splicing in sα i2 (Figure 1).
To test this hypothesis, we mutated the opossum alpha-2C serines and threonine residues to alanines and valine, respectively, and tested whether the expressed receptors would down-regulate.
Sequentially mutating each of the four serines to alanine decreased the phosphorylation of the receptor by approximately 25% for each serine, and mutating either the first two or the last two serines to alanines prevented agonist-induced desensitization, but not agonist-induced sequestration/internalization [ 12 ] . The influence of mutations in this motif on down-regulation has not been investigated.
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