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J. Biol. Chem., Vol. 262, Issue 7, 3086-3091, 03, 1987
CY Yang, D Manoogian, Q Pao, FS Lee, RD Knapp, AM Gotto Jr and HJ Pownall
The amino acid sequence of human lecithin:cholesterol acyltransferase has
been determined by degradation and alignment of peptides obtained from
tryptic and staphylococcal digestions and the cleavage with cyanogen
bromide and consisted of 416 amino acid residues. All of the tryptic
peptides of lecithin:cholesterol acyltransferase were isolated and
sequenced. Peptides resulting from digestion by staphylococcal protease,
cyanogen bromide cleavage, or the combination of the two methods were
employed to find overlapping segments. The N terminus of human
lecithin:cholesterol acyltransferase was determined to be phenylalanine by
sequencing the whole protein up to 40 residues while the C terminus was
identified as glutamic acid through carboxypeptidase Y cleavage. Cys50 and
Cys74 and Cys313 and Cys356 were identified as the two disulfide bridges
while the free sulfhydryl groups were located at positions 31 and 184. The
N-glycosylated sites of the protein were assigned to asparagines at
positions 20, 84, 272, and 384. The active site of lecithin:cholesterol
acyltransferase was identified as serine on position 181 according to its
homology with other serine-type esterases which have a common structure of
glycine-variable amino acid- active serine-variable amino acid-glycine
(Gly-X-Ser-X-Gly) with the variable amino acids disrupting the homology. No
long internal repeats or homologies with apolipoproteins were found. The
secondary structure is consistent with the results of predictive
algorithms. A simple model of the enzyme is proposed on the basis of
available chemical data and predictive methods.
Lecithin:cholesterol acyltransferase. Functional regions and a structural model of the enzyme
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