1a0l

</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=APA:(2S)-3-(4-CARBAMIMIDOYLPHENYL)-2-HYDROXYPROPANOIC+ACID'>APA</scene></td></tr>

<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[https://en.wikipedia.org/wiki/Tryptase Tryptase], with EC number [https://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.4.21.59 3.4.21.59] </span></td></tr>

[[https://www.uniprot.org/uniprot/TRYB2_HUMAN TRYB2_HUMAN]] Tryptase is the major neutral protease present in mast cells and is secreted upon the coupled activation-degranulation response of this cell type. Has an immunoprotective role during bacterial infection. Required to efficiently combat K.pneumoniae infection (By similarity).

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== Publication Abstract from PubMed ==

Human tryptase, a mast-cell-specific serine proteinase that may be involved in causing asthma and other allergic and inflammatory disorders, is unique in two respects: it is enzymatically active only as a heparin-stabilized tetramer, and it is resistant to all known endogenous proteinase inhibitors. The 3-A crystal structure of human beta-tryptase in a complex with 4-amidinophenyl pyruvic acid shows four quasi-equivalent monomers arranged in a square flat ring of pseudo 222 symmetry. Each monomer contacts its neighbours at two different interfaces through six loop segments. These loops are located around the active site of beta-tryptase and differ considerably in length and conformation from loops of other trypsin-like proteinases. The four active centres of the tetramer are directed towards an oval central pore, restricting access for macromolecular substrates and enzyme inhibitors. Heparin chains might stabilize the complex by binding to an elongated patch of positively charged residues spanning two adjacent monomers. The nature of this unique tetrameric architecture explains many of tryptase's biochemical properties and provides a basis for the rational design of monofunctional and bifunctional tryptase inhibitors.

Human beta-tryptase is a ring-like tetramer with active sites facing a central pore.,Pereira PJ, Bergner A, Macedo-Ribeiro S, Huber R, Matschiner G, Fritz H, Sommerhoff CP, Bode W Nature. 1998 Mar 19;392(6673):306-11. PMID:9521329<ref>PMID:9521329</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>

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== References ==

<references/>

[[Category: Bergner, A]]

[[Category: Bode, W]]

[[Category: Fritz, H]]

[[Category: Huber, R]]

[[Category: Macedo-Ribeiro, S]]

[[Category: Matschiner, G]]

[[Category: Pereira, P J.B]]

[[Category: Sommerhoff, C P]]

[[Category: Trypsin-like serine proteinase]]