
TY  - JOUR
A1  - O'Donnell, IJ 
A1  - Inglis, AS 
T1  - Amino Acid Sequence of a Feather Keratin From Silver Gull (Larus novae-hollandiae) and Comparison with One from Emu (Dromaius novae-hollandiae)
JF  - Australian Journal of Biological Sciences
JO  - Aust. Jnl. Of Bio. Sci.
Y1  - 1974
VL  - 27
IS  - 4
SP  - 369
EP  - 382
KW  - 
UR  - https://doi.org/10.1071/BI9740369 
N2  - 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. 
ER  -

