Islam A, Persson B, Zaidi Z H, Jörnvall H
Department of Chemistry I, Karolinska Institutet, Stockholm, Sweden.
J Protein Chem. 1989 Aug;8(4):481-6. doi: 10.1007/BF01026432.
The primary structure of Rose-ringed Parakeet hemoglobin beta-chain was established, completing the analysis of this hemoglobin. Comparison with other avian beta-chains show variations smaller than those for the corresponding alpha-chains. There are 11 amino acid exchanges in relationship to the only other characterized psittaciform beta-chain, and a total of 35 positions are affected by differences among all avian beta-chains analyzed (versus 61 for the alpha-chains). At three positions, the Psittacula beta-chain has residues unique to this species. Three alpha 1 beta 1 contacts are modified, by substitutions at positions beta 51, beta 116, and beta 125.
环颈鹦鹉血红蛋白β链的一级结构已确定，从而完成了对这种血红蛋白的分析。与其他鸟类β链的比较表明，其变异程度小于相应的α链。与唯一另一种已鉴定的鹦鹉形目β链相比，有11个氨基酸交换，在所分析的所有鸟类β链中，共有35个位置受到差异影响（α链为61个）。在三个位置上，长尾鹦鹉β链具有该物种特有的残基。通过β51、β116和β125位置的取代，三个α1β1接触点发生了改变。
