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1a8f

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[[Image:1a8f.gif|left|200px]]
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{{STRUCTURE_1a8f| PDB=1a8f | SCENE= }}
{{STRUCTURE_1a8f| PDB=1a8f | SCENE= }}
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'''HUMAN SERUM TRANSFERRIN, RECOMBINANT N-TERMINAL LOBE'''
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===HUMAN SERUM TRANSFERRIN, RECOMBINANT N-TERMINAL LOBE===
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==Overview==
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The N-lobe of human serum transferrin (hTF/2N) has been expressed in baby hamster kidney cells and crystallized in both orthorhombic (P212121) and tetragonal (P41212) space groups. Both crystal forms diffract to high resolution (1.6 and 1.8 A, respectively) and have been solved by molecular replacement. Subsequent refinement resulted in final models for the structure of hTF/2N that had crystallographic R-factors of 18.1 and 19.7% for the two crystal forms, respectively; these models represent the highest-resolution transferrin structures determined to date. The hTF/2N polypeptide has a folding pattern similar to those of other transferrins, including the presence of a deep cleft that contains the metal-binding site. In contrast to other transferrins, both crystal forms of hTF/2N display disorder at the iron-binding site; model building suggests that this disorder consists of alternative conformations of the synergistically bound carbonate anion, the side chain for Arg-124, and several solvent molecules. Subsequent refinement revealed that conformation A has an occupancy of 0.63-0. 65 and corresponds to the structure of the iron-binding site found in other transferrins. The alternative conformation B has an occupancy of 0.35-0.37; in this structure, the carbonate has rotated 30 degrees relative to the iron and the side chain for Arg-124 has moved to accommodate the new carbonate position. Several water molecules appear to stabilize the carbonate anion in the two conformations. These structures are consistent with the protonation of the carbonate and resulting partial removal of the anion from the metal; these events would occur prior to cleft opening and metal release.
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(as it appears on PubMed at http://www.pubmed.gov), where 9609685 is the PubMed ID number.
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{{ABSTRACT_PUBMED_9609685}}
==About this Structure==
==About this Structure==
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[[Category: Nlobe]]
[[Category: Nlobe]]
[[Category: Transferrin]]
[[Category: Transferrin]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jun 30 16:21:46 2008''

Revision as of 13:21, 30 June 2008

Image:1a8f.png

Template:STRUCTURE 1a8f

HUMAN SERUM TRANSFERRIN, RECOMBINANT N-TERMINAL LOBE

Template:ABSTRACT PUBMED 9609685

About this Structure

1A8F is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.

Reference

Two high-resolution crystal structures of the recombinant N-lobe of human transferrin reveal a structural change implicated in iron release., MacGillivray RT, Moore SA, Chen J, Anderson BF, Baker H, Luo Y, Bewley M, Smith CA, Murphy ME, Wang Y, Mason AB, Woodworth RC, Brayer GD, Baker EN, Biochemistry. 1998 Jun 2;37(22):7919-28. PMID:9609685

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