1nig
From Proteopedia
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'''2.0 A Structure of Protein of Unknown Function from Thermoplasma acidophilum''' | '''2.0 A Structure of Protein of Unknown Function from Thermoplasma acidophilum''' | ||
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[[Category: MCSG, Midwest Center for Structural Genomics.]] | [[Category: MCSG, Midwest Center for Structural Genomics.]] | ||
[[Category: Sanishvili, R.]] | [[Category: Sanishvili, R.]] | ||
| - | [[Category: | + | [[Category: Four helixbundle]] |
| - | [[Category: | + | [[Category: Mcsg]] |
| - | [[Category: | + | [[Category: Midwest center for structural genomic]] |
| - | [[Category: | + | [[Category: Protein structure initiative]] |
| - | [[Category: | + | [[Category: Psi]] |
| - | [[Category: | + | [[Category: Structural genomic]] |
| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 02:34:28 2008'' | |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | |
Revision as of 23:34, 2 May 2008
2.0 A Structure of Protein of Unknown Function from Thermoplasma acidophilum
Overview
The crystal structure of the hypothetical protein TA1238 from Thermoplasma acidophilum was solved with multiple-wavelength anomalous diffraction and refined at 2.0 A resolution. The molecule consists of a typical four-helix antiparallel bundle with overhand connection. However, its oligomerization into a trimer leads to a coiled "super-helix" which is novel for such bundles. Its central feature, a six-stranded coiled coil, is also novel for proteins. TA1238 does not have strong sequence homologues in databases, but shows strong structural similarity with some proteins in the Protein Data Bank. The function could not be inferred from the sequence but the structure, with some rearrangement, bears some resemblance to the active site region of cobalamin adenosyltransferase (TA1434). Specifically, TA1238 retains Arg104, which is structurally equivalent to functionally critical Arg119 of TA1434. For such conformational change, the overhand connection of TA1238 might need to be involved in a gating mechanism that might be modulated by ligands and/or by interactions with the physiological partners. This allowed us to hypothesize that TA1238 could be involved in cobalamin biosyntheses.
About this Structure
1NIG is a Single protein structure of sequence from Thermoplasma acidophilum. Full crystallographic information is available from OCA.
Reference
Crystal structure of the hypothetical protein TA1238 from Thermoplasma acidophilum: a new type of helical super-bundle., Sanishvili R, Pennycooke M, Gu J, Xu X, Joachimiak A, Edwards AM, Christendat D, J Struct Funct Genomics. 2004;5(4):231-40. PMID:15704011 Page seeded by OCA on Sat May 3 02:34:28 2008
