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1fc1

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[[Image:1fc1.gif|left|200px]]
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{{STRUCTURE_1fc1| PDB=1fc1 | SCENE= }}
{{STRUCTURE_1fc1| PDB=1fc1 | SCENE= }}
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'''CRYSTALLOGRAPHIC REFINEMENT AND ATOMIC MODELS OF A HUMAN FC FRAGMENT AND ITS COMPLEX WITH FRAGMENT B OF PROTEIN A FROM STAPHYLOCOCCUS AUREUS AT 2.9-AND 2.8-ANGSTROMS RESOLUTION'''
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===CRYSTALLOGRAPHIC REFINEMENT AND ATOMIC MODELS OF A HUMAN FC FRAGMENT AND ITS COMPLEX WITH FRAGMENT B OF PROTEIN A FROM STAPHYLOCOCCUS AUREUS AT 2.9-AND 2.8-ANGSTROMS RESOLUTION===
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==Overview==
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The model of human Fc fragment was refined at 2.9-A resolution. Two different automated procedures for crystallographic refinement were used [Deisenhofer, J., &amp; Steigemann, W. (1975) Acta Crystallogr., Sec. B B31, 238; Jack, A., &amp; Levitt, M. (1978) Acta Crystallogr., Sect. A A34, 931]. The final R value is 0.22. The dimer of CH3 domains closely resembles the CH1-CL aggregate in Fab fragments. There is no contact between CH2 domains. The contact between CH2 and CH3 domains has about one-third of the size of the CH3-CH3 contact. The carbohydrate, a branched chain of nine hexose units, covers parts of the C-contact face of the CH2 domain, shielding hydrophobic residues on this surface. Six atoms of the carbohydrate are within hydrogen-bonding distance of atoms in the CH2 domain. Crystallographic refinement of the complex between Fc fragment and fragment B of protein A from Staphylococcus aureus reduced the R value of the model is 0.24. A major part of the structure of fragment B consists of two alpha helics; the rest of the polypeptide chain is folded irregularly. In the crystal, fragment B forms two contacts with Fc fragment molecules. Contact 1 involves residues from both helices of fragment B, and residues from the CH2 and CH3 domains of FC, and is predominantly hydrophobic. Contact 2 is smaller than contact 1. Residues from the second helix and adjacent residues of fragment B and residues only from the CH3 domain of Fc contribute to contact 2. The nature of contact 2 is mainly polar and includes a sulfate ion. There are strong arguments that contact 1 is the fragment B-Fc contact formed in solution under physiological conditions, while contact 2 is a crystal contact.
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(as it appears on PubMed at http://www.pubmed.gov), where 7236608 is the PubMed ID number.
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{{ABSTRACT_PUBMED_7236608}}
==About this Structure==
==About this Structure==
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[[Category: Deisenhofer, J.]]
[[Category: Deisenhofer, J.]]
[[Category: Immunoglobulin]]
[[Category: Immunoglobulin]]
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Revision as of 00:01, 1 July 2008

Image:1fc1.png

Template:STRUCTURE 1fc1

CRYSTALLOGRAPHIC REFINEMENT AND ATOMIC MODELS OF A HUMAN FC FRAGMENT AND ITS COMPLEX WITH FRAGMENT B OF PROTEIN A FROM STAPHYLOCOCCUS AUREUS AT 2.9-AND 2.8-ANGSTROMS RESOLUTION

Template:ABSTRACT PUBMED 7236608

About this Structure

1FC1 is a Single protein structure. Full crystallographic information is available from OCA.

Reference

Crystallographic refinement and atomic models of a human Fc fragment and its complex with fragment B of protein A from Staphylococcus aureus at 2.9- and 2.8-A resolution., Deisenhofer J, Biochemistry. 1981 Apr 28;20(9):2361-70. PMID:7236608

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