Conserved Protein Sequences and Structures
Highly conserved proteins are often required for basic cellular function, stability or reproduction. Conservation of protein sequences is indicated by the presence of identical amino acid residues at analogous parts of proteins. Conservation of protein structures is indicated by the presence of functionally equivalent, though not necessarily identical, amino acid residues and structures between analogous parts of proteins.
Shown below is an amino acid sequence alignment between two human zinc finger proteins, with GenBank accession numbers AAB24882 and AAB24881. Alignment was carried out using the clustalw sequence alignment program. Conserved amino acid sequences are marked by strings of on the third line of the sequence alignment. As can be seen from this alignment, these two proteins contain a number of conserved amino acid sequences (represented by identical letters aligned between the two sequences).
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