3Q76

Structure of human neutrophil elastase (uncomplexed)

Summary for 3Q76

• Entry DOI: 10.2210/pdb3q76/pdb
• Related: 3Q77
• Descriptor: Neutrophil elastase, 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-[alpha-L-fucopyranose-(1-6)]2-acetamido-2-deoxy-beta-D-glucopyranose, 2-acetamido-2-deoxy-beta-D-glucopyranose, ... (5 entities in total)
• Functional Keywords: trypsin family fold, protease, hydrolase
• Biological source: Homo sapiens (human)
• Total number of polymer chains: 2
• Total formula weight: 49278.16

Authors

Hansen, G.,Niefind, K. (deposition date: 2011-01-04, release date: 2011-05-11, Last modification date: 2024-10-30)

Primary citation

Hansen, G.,Gielen-Haertwig, H.,Reinemer, P.,Schomburg, D.,Harrenga, A.,Niefind, K.
Unexpected active-site flexibility in the structure of human neutrophil elastase in complex with a new dihydropyrimidone inhibitor.
J.Mol.Biol., 409:681-691, 2011

PubMed Abstract: Human neutrophil elastase (HNE), a trypsin-type serine protease, is of pivotal importance in the onset and progression of chronic obstructive pulmonary disease (COPD). COPD encompasses a group of slowly progressive respiratory disorders and is a major medical problem and the fifth leading cause of death worldwide. HNE is a major target for the development of compounds that inhibit the progression of long-term lung function decline in COPD patients. Here, we present the three-dimensional structure of a potent dihydropyrimidone inhibitor (DHPI) non-covalently bound to HNE at a resolution of 2.0 Å. The inhibitor binds to the active site in a unique orientation addressing S1 and S2 subsites of the protease. To facilitate further analysis of this binding mode, we determined the structure of the uncomplexed enzyme at a resolution of 1.86 Å. Detailed comparisons of the HNE:DHPI complex with the uncomplexed HNE structure and published structures of other elastase:inhibitor complexes revealed that binding of DHPI leads to large conformational changes in residues located in the S2 subsite. The rearrangement of residues Asp95-Leu99B creates a deep, well-defined cavity, which is filled by the P2 moiety of the inhibitor molecule to almost perfect shape complementarity. The shape of the S2 subsite in complex with DHPI clearly differs from all other observed HNE structures. The observed structural flexibility of the S2 subsite is a key feature for the understanding of the binding mode of DHPIs in general and the development of new HNE selective inhibitors.

PubMed: 21549129
DOI: 10.1016/j.jmb.2011.04.047

Experimental method

X-RAY DIFFRACTION (1.861 Å)