Valine replaces glutamic acid in sickle cell anaemia. The migration rate of HbSHBS in relation to HbAHDA at pH 9.2 is shown in Part B along with its pl.
As a result, valine, a hydrophobic amino acid, is used in place of glutamic acid, a negatively charged sixth amino acid.
Base substitution from glutamic acid to valine takes place at the appropriate location along the beta chain of the haemoglobin molecule in sickle cell anaemia. This substitution happens as a result of the beta globin gene's sixth codon's single base change from GAG to GUG.
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