Purification, crystallization and preliminary X-ray analysis of human mannose-binding lectin-associated serine protease-1 (MASP-1) catalytic region

József Dobó, Veronika Harmat, Edina Sebestyén, László Beinrohr, Péter Závodszky, Péter Gál

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17 Citations (Scopus)

Abstract

MASP-1, a multidomain serine protease, is a component of the lectin pathway of complement. Its precise function is unknown, although it seems to enhance the complement-activating capacity of MASP-2, a related enzyme. MASP-1 has also been implicated as playing a role in blood coagulation. It is mostly found associated with mannose-binding lectin (MBL) and ficolins. Early attempts to crystallize MASP-1 failed because of the inhomogeneity of the purified material. MASP-1 was shown by acidic nondenaturing PAGE to be composed of differently charged species, which are most likely to be the products of deamidation occurring during the refolding procedure. Sequential cation-exchange and anion-exchange chromatography resulted in a homogeneous material, which was successfully crystallized. The best crystal diffracted to 2.55 Å resolution and belonged to space group P212121, with unit-cell parameters a = 68.4, b = 70.4, c = 121.4 Å. The crystal structure of MASP-1 may help in understanding the function of this mysterious serine protease.

Original languageEnglish
Pages (from-to)781-784
Number of pages4
JournalActa Crystallographica Section F: Structural Biology and Crystallization Communications
Volume64
Issue number9
DOIs
Publication statusPublished - Sep 11 2008

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ASJC Scopus subject areas

  • Biophysics
  • Structural Biology
  • Biochemistry
  • Genetics
  • Condensed Matter Physics

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