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1b1x

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[[Image:1b1x.gif|left|200px]]
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{{STRUCTURE_1b1x| PDB=1b1x | SCENE= }}
{{STRUCTURE_1b1x| PDB=1b1x | SCENE= }}
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'''STRUCTURE OF DIFERRIC MARE LACTOFERRIN AT 2.62A RESOLUTION'''
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===STRUCTURE OF DIFERRIC MARE LACTOFERRIN AT 2.62A RESOLUTION===
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==Overview==
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Lactoferrin is a monomeric glycoprotein with a molecular mass of approximately 80 kDa. The three-dimensional structure of mare diferric lactoferrin (mlf) has been determined at 2.6 A resolution. The protein crystallizes in the space group P 212121with a=85.2 A, b=99.5 A, c=103.1 A with a solvent content of 55 % (v/v). The structure was solved by the molecular replacement method using human diferric lactoferrin as the model. The structure has been refined using XPLOR to a final R -factor of 0.194 for all data in the 15-2.6 A resolution range. The amino acid sequence of mlf was determined using a cDNA method. The final refined model comprises 5281 protein atoms, 2 Fe3+, 2 CO32-and 112 water molecules. The overall folding of mlf is similar to that of other proteins of the transferrin family. The protein folds into two globular lobes, N and C. The lobes are further divided into two domains, N1 and N2, and C1 and C2. The iron-binding cleft is situated between the domains in each lobe. The N lobe appears to be well ordered and is more stable than the C lobe in mlf unlike in other lactoferrins, where the C lobe is the more stable. The opening of the binding cleft in the N lobe of mlf is narrower than those in other proteins of the transferrin family. This is very unusual and is found only in mare lactoferrin. Apart from certain hydrophobic interactions at the mouth of the cleft, one salt-bridge (Lys301 . . . . . . . . Glu216) crosses between the two walls of the cleft. The two lobes are connected covalently by a three-turn alpha-helix involving residues 334-344. The N lobe displays a highly ordered structure with appreciably low temperature factors. The iron coordination is more symmetrical in the N lobe than in the C lobe. There are only 16 intermolecular hydrogen bonds in the structure of mlf.
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(as it appears on PubMed at http://www.pubmed.gov), where 10366507 is the PubMed ID number.
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{{ABSTRACT_PUBMED_10366507}}
==About this Structure==
==About this Structure==
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[[Category: Lactoferrin]]
[[Category: Lactoferrin]]
[[Category: Structure]]
[[Category: Structure]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 10:57:38 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jun 30 18:03:07 2008''

Revision as of 15:03, 30 June 2008

Image:1b1x.png

Template:STRUCTURE 1b1x

STRUCTURE OF DIFERRIC MARE LACTOFERRIN AT 2.62A RESOLUTION

Template:ABSTRACT PUBMED 10366507

About this Structure

1B1X is a Single protein structure of sequence from Equus caballus. This structure supersedes the now removed PDB entry 1bgr. Full crystallographic information is available from OCA.

Reference

Three-dimensional structure of mare diferric lactoferrin at 2.6 A resolution., Sharma AK, Paramasivam M, Srinivasan A, Yadav MP, Singh TP, J Mol Biol. 1999 Jun 4;289(2):303-17. PMID:10366507

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