1xp4
From Proteopedia
(New page: 200px<br /><applet load="1xp4" size="450" color="white" frame="true" align="right" spinBox="true" caption="1xp4, resolution 2.80Å" /> '''Crystal structure of...) |
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| - | [[Image:1xp4.jpg|left|200px]]<br /><applet load="1xp4" size=" | + | [[Image:1xp4.jpg|left|200px]]<br /><applet load="1xp4" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="1xp4, resolution 2.80Å" /> | caption="1xp4, resolution 2.80Å" /> | ||
'''Crystal structure of a peptidoglycan synthesis regulatory factor (PBP3) from Streptococcus pneumoniae'''<br /> | '''Crystal structure of a peptidoglycan synthesis regulatory factor (PBP3) from Streptococcus pneumoniae'''<br /> | ||
==Overview== | ==Overview== | ||
| - | Penicillin-binding proteins (PBPs) are membrane-associated enzymes which | + | Penicillin-binding proteins (PBPs) are membrane-associated enzymes which perform critical functions in the bacterial cell division process. The single d-Ala,d-Ala (d,d)-carboxypeptidase in Streptococcus pneumoniae, PBP3, has been shown to play a key role in control of availability of the peptidoglycal substrate during cell growth. Here, we have biochemically characterized and solved the crystal structure of a soluble form of PBP3 to 2.8 A resolution. PBP3 folds into an NH(2)-terminal, d,d-carboxypeptidase-like domain, and a COOH-terminal, elongated beta-rich region. The carboxypeptidase domain harbors the classic signature of the penicilloyl serine transferase superfamily, in that it contains a central, five-stranded antiparallel beta-sheet surrounded by alpha-helices. As in other carboxypeptidases, which are present in species whose peptidoglycan stem peptide has a lysine residue at the third position, PBP3 has a 14-residue insertion at the level of its omega loop, a feature that distinguishes it from carboxypeptidases from bacteria whose peptidoglycan harbors a diaminopimelate moiety at this position. PBP3 performs substrate acylation in a highly efficient manner (k(cat)/K(m) = 50,500 M(-1) x s(-1)), an event that may be linked to role in control of pneumococcal peptidoglycan reticulation. A model that places PBP3 poised vertically on the bacterial membrane suggests that its COOH-terminal region could act as a pedestal, placing the active site in proximity to the peptidoglycan and allowing the protein to "skid" on the surface of the membrane, trimming pentapeptides during the cell growth and division processes. |
==About this Structure== | ==About this Structure== | ||
| - | 1XP4 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Streptococcus_pneumoniae Streptococcus pneumoniae] with SO4 and IOD as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/Serine-type_D-Ala-D-Ala_carboxypeptidase Serine-type D-Ala-D-Ala carboxypeptidase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.4.16.4 3.4.16.4] Full crystallographic information is available from [http:// | + | 1XP4 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Streptococcus_pneumoniae Streptococcus pneumoniae] with <scene name='pdbligand=SO4:'>SO4</scene> and <scene name='pdbligand=IOD:'>IOD</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/Serine-type_D-Ala-D-Ala_carboxypeptidase Serine-type D-Ala-D-Ala carboxypeptidase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.4.16.4 3.4.16.4] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1XP4 OCA]. |
==Reference== | ==Reference== | ||
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[[Category: Dessen, A.]] | [[Category: Dessen, A.]] | ||
[[Category: Dideberg, O.]] | [[Category: Dideberg, O.]] | ||
| - | [[Category: Gouellec, A | + | [[Category: Gouellec, A Le.]] |
| - | [[Category: Guilmi, A | + | [[Category: Guilmi, A M.Di.]] |
[[Category: Morlot, C.]] | [[Category: Morlot, C.]] | ||
[[Category: Pernot, L.]] | [[Category: Pernot, L.]] | ||
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[[Category: omega-like loop]] | [[Category: omega-like loop]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 15:57:09 2008'' |
Revision as of 13:57, 21 February 2008
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Crystal structure of a peptidoglycan synthesis regulatory factor (PBP3) from Streptococcus pneumoniae
Overview
Penicillin-binding proteins (PBPs) are membrane-associated enzymes which perform critical functions in the bacterial cell division process. The single d-Ala,d-Ala (d,d)-carboxypeptidase in Streptococcus pneumoniae, PBP3, has been shown to play a key role in control of availability of the peptidoglycal substrate during cell growth. Here, we have biochemically characterized and solved the crystal structure of a soluble form of PBP3 to 2.8 A resolution. PBP3 folds into an NH(2)-terminal, d,d-carboxypeptidase-like domain, and a COOH-terminal, elongated beta-rich region. The carboxypeptidase domain harbors the classic signature of the penicilloyl serine transferase superfamily, in that it contains a central, five-stranded antiparallel beta-sheet surrounded by alpha-helices. As in other carboxypeptidases, which are present in species whose peptidoglycan stem peptide has a lysine residue at the third position, PBP3 has a 14-residue insertion at the level of its omega loop, a feature that distinguishes it from carboxypeptidases from bacteria whose peptidoglycan harbors a diaminopimelate moiety at this position. PBP3 performs substrate acylation in a highly efficient manner (k(cat)/K(m) = 50,500 M(-1) x s(-1)), an event that may be linked to role in control of pneumococcal peptidoglycan reticulation. A model that places PBP3 poised vertically on the bacterial membrane suggests that its COOH-terminal region could act as a pedestal, placing the active site in proximity to the peptidoglycan and allowing the protein to "skid" on the surface of the membrane, trimming pentapeptides during the cell growth and division processes.
About this Structure
1XP4 is a Single protein structure of sequence from Streptococcus pneumoniae with and as ligands. Active as Serine-type D-Ala-D-Ala carboxypeptidase, with EC number 3.4.16.4 Full crystallographic information is available from OCA.
Reference
Crystal structure of a peptidoglycan synthesis regulatory factor (PBP3) from Streptococcus pneumoniae., Morlot C, Pernot L, Le Gouellec A, Di Guilmi AM, Vernet T, Dideberg O, Dessen A, J Biol Chem. 2005 Apr 22;280(16):15984-91. Epub 2004 Dec 13. PMID:15596446
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