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1rtp

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{{STRUCTURE_1rtp| PDB=1rtp | SCENE= }}
{{STRUCTURE_1rtp| PDB=1rtp | SCENE= }}
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'''REFINED X-RAY STRUCTURE OF RAT PARVALBUMIN, A MAMMALIAN ALPHA-LINEAGE PARVALBUMIN, AT 2.0 A RESOLUTION'''
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===REFINED X-RAY STRUCTURE OF RAT PARVALBUMIN, A MAMMALIAN ALPHA-LINEAGE PARVALBUMIN, AT 2.0 A RESOLUTION===
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==Overview==
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We present here the X-ray crystal structure of the rat alpha-parvalbumin from fast twitch muscle. This protein (M(r) 11.8 kDa) crystallizes in space group P2(1)2(1)2(1) with unit cell dimensions of a = 34.3 A, b = 55.0 A, c = 156.1 A and three molecules in the asymmetric unit. The protein structure was solved by the molecular replacement method and has been refined to a crystallographic R-factor [formula: see text] of 0.181 for all reflections with I/sigma(I) &gt; or = 2 (I = intensity) between 8.0 and 2.0 A resolution. The molecules located most easily in the molecular replacement rotation function had lower overall thermal motion parameters and higher numbers of intermolecular crystal packing contacts. The overall fold of the polypeptide chain for the rat alpha-parvalbumin is similar to other known parvalbumin structures (root-mean-square deviations in alpha-carbon atom positions range from 0.60 to 0.87 A). There are two Ca(2+)-binding sites in parvalbumins, and there is some evidence for a third ion-binding site, adjacent to the CD site, in the rat species. The level of structural variability among the best-ordered regions of the three independent rat alpha-parvalbumin molecules in the crystallographic asymmetric unit is two to three times higher than the mean coordinate error (0.10 A), indicating flexibility in the molecule. Sequence differences between alpha and beta-lineage parvalbumins result in repacking of the hydrophobic core and some shifts in the protein backbone. The shifts are localized, however, and entire helices do not shift as rigid units.
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{{ABSTRACT_PUBMED_8289291}}
==About this Structure==
==About this Structure==
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[[Category: Sielecki, A R.]]
[[Category: Sielecki, A R.]]
[[Category: Calcium-binding protein]]
[[Category: Calcium-binding protein]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 07:53:47 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 09:33:52 2008''

Revision as of 06:33, 29 July 2008

Image:1rtp.png

Template:STRUCTURE 1rtp

REFINED X-RAY STRUCTURE OF RAT PARVALBUMIN, A MAMMALIAN ALPHA-LINEAGE PARVALBUMIN, AT 2.0 A RESOLUTION

Template:ABSTRACT PUBMED 8289291

About this Structure

1RTP is a Single protein structure of sequence from Rattus rattus. Full crystallographic information is available from OCA.

Reference

Refined crystal structure of rat parvalbumin, a mammalian alpha-lineage parvalbumin, at 2.0 A resolution., McPhalen CA, Sielecki AR, Santarsiero BD, James MN, J Mol Biol. 1994 Jan 14;235(2):718-32. PMID:8289291

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