1pgx

<table><tr><td colspan='2'>[[1pgx]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/9stre 9stre]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1PGX OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1PGX FirstGlance]. <br>

</td></tr><tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1pgx FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1pgx OCA], [https://pdbe.org/1pgx PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1pgx RCSB], [https://www.ebi.ac.uk/pdbsum/1pgx PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1pgx ProSAT]</span></td></tr>

[[https://www.uniprot.org/uniprot/SPG1_STRSG SPG1_STRSG]] Binds to the constant Fc region of IgG with high affinity.

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== Publication Abstract from PubMed ==

The structure of the B2 immunoglobulin-binding domain of streptococcal protein G has been determined at 1.67-A resolution using a combination of single isomorphous replacement (SIR) phasing and manual fitting of the coordinates of the NMR structure of B1 domain of streptococcal protein G [Gronenborn, A. M., et al. (1991) Science 253, 657-661]. The final R value was 0.191 for data between 8.0 and 1.67 A. The structure described here has 13 residues preceding the 57-residue Ig-binding domain and 13 additional residues following it, for a total of 83 residues. The 57-residue binding domain is well-determined in the structure, having an average B factor of 18.0. Only residues 8-77 could be located in the electron density maps, with the ends of the structure fading into disorder. Like the B1 domain, the B2 domain consists of four beta-strands and a single helix lying diagonally across the beta-sheet, with a -1, +3 chi, -1 topology. This small structure is extensively hydrogen-bonded and has a relatively large hydrophobic core. These structural observations may account for the exceptional stability of protein G. A comparison of the B2 domain X-ray structure and the B1 domain NMR structure showed minor differences in the turn between strands and two and a slight displacement of the helix relative to the sheet. Hydrogen bonds between crystallographically related molecules account for most of these differences.

1.67-A X-ray structure of the B2 immunoglobulin-binding domain of streptococcal protein G and comparison to the NMR structure of the B1 domain.,Achari A, Hale SP, Howard AJ, Clore GM, Gronenborn AM, Hardman KD, Whitlow M Biochemistry. 1992 Nov 3;31(43):10449-57. PMID:1420164<ref>PMID:1420164</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>

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<div class="pdbe-citations 1pgx" style="background-color:#fffaf0;"></div>

== References ==

<references/>

[[Category: Achari, A]]

[[Category: Howard, A J]]

[[Category: Whitlow, M]]

[[Category: Immunoglobulin binding protein]]