
%0 Journal Article
%A O'Donnell, IJ 
%A Inglis, AS 
%T Amino Acid Sequence of a Feather Keratin From Silver Gull (Larus novae-hollandiae) and Comparison with One from Emu (Dromaius novae-hollandiae)
%J Australian Journal of Biological Sciences
%D 1974/08/01
%V 27
%N 4
%P 369-382
%K 
%R https://doi.org/10.1071/BI9740369
%U https://www.publish.csiro.au/paper/BI9740369 
%X The amino acid sequence of the major components of the silver gull feather calamus has been determined and compared with that of the emu. The sequenator was used with a modified Edman-Begg program to facilitate determination of the sequence of the large hydrophobic fragment obtained on tryptic digestion. The main features of the comparison were: (1) the overall structures of the polypeptide chains were similar, having non-crystalline cystine-rich sections towards either end of the chain separated by a large crystalline region of 62 residues which contained the majority of the hydrophobic and serine and glycine residues; (2) approximately one-sixth of the residues were different in the two species, with the majority of changes occurring in the tails (i.e. non-crystalline or matrix region). The data argue for stringent demands in the selection of amino acids for the crystalline part of the feather molecule, a severity that is probably comparable to the strict requirements for the sequence of some of the enzymes. 
