Preliminary neutron and X-ray crystallographic studies of equine cyanomethemoglobin.
Room-temperature and 100 K X-ray and room-temperature neutron diffraction data have been measured from equine cyanomethemoglobin to 1.7 A resolution using a home source, to 1.6 A resolution on NE-CAT at the Advanced Photon Source and to 2.0 A resolution on the PCS at Los Alamos Neutron Science Center, respectively. The cyanomethemoglobin is in the R state and preliminary room-temperature electron and neutron scattering density maps clearly show the protonation states of potential Bohr groups. Interestingly, a water molecule that is in the vicinity of the heme group and coordinated to the distal histidine appears to be expelled from this site in the low-temperature structure.
Kovalevsky
A Y
AY
Bioscience Division, MS M888, Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
Fisher
S Zoe
SZ
Seaver
Sean
S
Mustyakimov
Marat
M
Sukumar
Narayanasami
N
Langan
Paul
P
Mueser
Timothy C
TC
Hanson
B Leif
BL
D000818:Animals; D018360:Crystallography, X-Ray; D006736:Horses; D008706:Methemoglobin / Q000031:analogs & derivatives* / Q000737:chemistry; D008958:Models, Molecular; D033363:Neutron Diffraction; D017434:Protein Structure, Tertiary
C007169:cyanomethemoglobin; D008706:Methemoglobin
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