Purification, crystallization, preliminary X-ray diffraction and molecular-replacement studies of great cormorant (Phalacrocorax carbo) haemoglobin.
Haemoglobin is the iron-containing oxygen-transport metalloprotein that is present in the red blood cells of all vertebrates. In recent decades, there has been substantial interest in attempting to understand the structural basis and functional diversity of avian haemoglobins. Towards this end, purification, crystallization, preliminary X-ray diffraction and molecular-replacement studies have been carried out on cormorant (Phalacrocorax carbo) haemoglobin. Crystals were grown by the hanging-drop vapour-diffusion method using PEG 3350, NaCl and glycerol as precipitants. The crystals belonged to the trigonal system P3₁21, with unit-cell parameters a=b=55.64, c=153.38 Å, β=120.00°; a complete data set was collected to a resolution of 3.5 Å. Matthews coefficient analysis indicated that the crystals contained a half-tetramer in the asymmetric unit.
Department of Physics, Presidency College, Chennai 600 005, India.
G
G
Jagadeesan
CAS in Crystallography and Biophysics, University of Madras, Chennai 600 025, India.
P
P
Malathy
CAS in Crystallography and Biophysics, University of Madras, Chennai 600 025, India.
K
K
Gunasekaran
GKM College of Engineering and Technology, Kamaraj Salai, Chennai 600 063, India.
S
S
Harikrishna Etti
Department of Physics, Presidency College, Chennai 600 005, India.
S
S
Aravindhan
D000818:Animals; D001717:Birds; D003460:Crystallization; D004912:Erythrocytes / Q000737:chemistry; D006454:Hemoglobins / Q000737:chemistry* / Q000302:isolation & purification*; D014961:X-Ray Diffraction
D006454:Hemoglobins
Phalacrocorax carbo; avian haemoglobin; great cormorant; molecular replacement