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The formation of stable fatty acid substrate complexes in prostaglandin H(2) synthase-1.

Abstract：

:We have developed a protocol to purify apo-ovine (o) prostaglandin endoperoxide H(2) synthase-1 (PGHS-1) to homogeneity from ram seminal vesicles. The resulting apo enzyme can then be reconstituted with Co(3+)-protoporphyrin IX instead of Fe(3+)-protoporphyrin IX to produce a native-like, but functionally inert, enzyme suitable for the production of enzyme:fatty acid substrate complexes for biophysical characterization. Co(3+)-protoporphyrin IX reconstituted oPGHS-1 (Co(3+)-oPGHS-1) displays a Soret band at 426 nm that shifts to 406 nm upon reduction. This behavior is similar to that of cobalt-reconstituted horseradish peroxidase and myoglobin and suggests, along with resonance Raman spectroscopy, that the Co(3+)-protoporphyrin IX group is one in a six-coordinate, cobalt(III) state. However, Co(3+)-oPGHS-1 does not display cyclooxygenase or peroxidase activity, nor does the enzyme produce prostaglandin products when incubated with [1-(14)C]arachidonic acid. The cocrystallization of Co(3+)-oPGHS-1 and the substrate arachidonic acid (AA) has been achieved using sodium citrate as the precipitant in the presence of the nonionic detergent N-octyl-beta-d-glucopyranoside. Crystals are hexagonal, belonging to the space group P6(5)22, with cell dimensions of a = b = 181.69 A and c = 103.74 A, and a monomer in the asymmetric unit. GC-MS analysis of dissolved crystals indicates that unoxidized AA is bound within the crystals.

journal_name

Arch Biochem Biophys

journal_title

Archives of biochemistry and biophysics

authors

Malkowski MG,Theisen MJ,Scharmen A,Garavito RM

doi

10.1006/abbi.2000.1906

subject

Has Abstract

pub_date

2000-08-01 00:00:00

pages

39-45

issue

1

eissn

0003-9861

issn

1096-0384

pii

S0003-9861(00)91906-4

journal_volume

380

pub_type

杂志文章

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