1tpf
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(New page: 200px<br /><applet load="1tpf" size="450" color="white" frame="true" align="right" spinBox="true" caption="1tpf, resolution 1.8Å" /> '''COMPARISON OF THE STR...)
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Revision as of 01:21, 21 November 2007
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COMPARISON OF THE STRUCTURES AND THE CRYSTAL CONTACTS OF TRYPANOSOMAL TRIOSEPHOSPHATE ISOMERASE IN FOUR DIFFERENT CRYSTAL FORMS
Overview
Triosephosphate isomerase (TIM) is a dimeric enzyme consisting of 2, identical subunits. Trypanosomal TIM can be crystallized in 4 different, spacegroups: P2(1)2(1)2(1), C2(big cell), C2(small cell), and P1. The P1, crystal form only grows in the presence of 1.4 M DMSO; there are 2 DMSO, binding sites per subunit. The structures have been refined at a, resolution of 1.83 A, 2.10 A, 2.13 A, and 1.80 A, respectively. In the 4, different spacegroups the TIM subunit can be observed in the context of 7, different crystallographic environments. In the C2 cells, the dimer 2-fold, axis coincides with a crystallographic 2-fold axis. The similarities and, differences of the 7 subunits are discussed. In 6 subunits the flexible, loop (loop 6) is open, whereas in the P2(1)2(1)2(1) cell, the flexible, loop of subunit 2 is in an almost closed conformation. The crystal, contacts in the 4 different crystal forms are predominantly generated by, polar residues in loops. A statistical analysis of the residues involved, in crystal contacts shows that, in particular, serines are frequently, involved in these interactions; 19% of the exposed serines are involved in, crystal contacts.
About this Structure
1TPF is a Single protein structure of sequence from Trypanosoma brucei brucei with DMS as ligand. Active as Triose-phosphate isomerase, with EC number 5.3.1.1 Full crystallographic information is available from OCA.
Reference
Comparison of the structures and the crystal contacts of trypanosomal triosephosphate isomerase in four different crystal forms., Kishan KV, Zeelen JP, Noble ME, Borchert TV, Wierenga RK, Protein Sci. 1994 May;3(5):779-87. PMID:8061607
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