This old version of Proteopedia is provided for student assignments while the new version is undergoing repairs. Content and edits done in this old version of Proteopedia after March 1, 2026 will eventually be lost when it is retired in about June of 2026.

Apply for new accounts at the new Proteopedia. Your logins will work in both the old and new versions.

1ptf

From Proteopedia

(Difference between revisions)

Jump to: navigation, search

Revision as of 23:03, 11 September 2015

THE 1.6 ANGSTROMS STRUCTURE OF HISTIDINE-CONTAINING PHOSPHOTRANSFER PROTEIN HPR FROM STREPTOCOCCUS FAECALIS

Structural highlights

1ptf is a 1 chain structure with sequence from "enterococcus_proteiformis"_thiercelin_and_jouhaud_1903 "enterococcus proteiformis" thiercelin and jouhaud 1903. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum

Function

[PTHP_ENTFA] General (non sugar-specific) component of the phosphoenolpyruvate-dependent sugar phosphotransferase system (sugar PTS). This major carbohydrate active-transport system catalyzes the phosphorylation of incoming sugar substrates concomitantly with their translocation across the cell membrane. The phosphoryl group from phosphoenolpyruvate (PEP) is transferred to the phosphoryl carrier protein HPr by enzyme I. Phospho-HPr then transfers it to the permease (enzymes II/III). P-Ser-HPr interacts with the catabolite control protein A (CcpA), forming a complex that binds to DNA at the catabolite response elements cre, operator sites preceding a large number of catabolite-regulated genes. Thus, P-Ser-HPr is a corepressor in carbon catabolite repression (CCR), a mechanism that allows bacteria to coordinate and optimize the utilization of available carbon sources. P-Ser-HPr also plays a role in inducer exclusion, in which it probably interacts with several non-PTS permeases and inhibits their transport activity (By similarity).

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

Publication Abstract from PubMed

The histidine-containing phosphocarrier protein (HPr) is a central component of the phosphoenolpyruvate: sugar phosphotransferase system (PTS) that transports carbohydrates across the cell membrane of bacteria. The three-dimensional structure of Gram-positive Streptococcus faecalis HPr has been determined using the method of multiple isomorphous replacement. The R factor for all data is 0.156 for S. faecalis HPr at 1.6 A resolution with very good geometry. The overall folding topology of HPr is a classical open-faced beta-sandwich, consisting of four antiparallel beta-strands and three alpha-helices. Remarkable disallowed Ramachandran torsion angles of Ala16 at the active center, revealed by the X-ray structure of S. faecalis HPr, demonstrate a unique example of torsion-angle strain that is likely involved directly in protein function. A brief report concerning the torsion-angle strain has been presented recently. A newly-determined pH 7.0 structure is shown to have the same open conformation of the active center and the same torsion-angle strain at Ala16, suggesting that pH is not responsible for the structural observations. The current structure suggests a role for residues 12 and 51 in HPr's function, since they are involved in the active center through direct and indirect hydrogen-bonding interactions with the imidazole ring of His15. It is found that Ser46, the regulatory site in HPr from Gram-positive bacteria, N-caps the minor alpha-B helix and is also involved in the Asn43-Ser46 beta-turn. This finding, in conjunction with the proposed routes of communication between the regulatory site Ser46 and the active center in S. faecalis HPr, provides new insight into the understanding of how Ser46 might function. The putative involvement of the C-terminal alpha-carboxyl group and the related Gly67-Glu70 reverse beta-turn with respect to the function of HPr are described.

The 1.6 A structure of histidine-containing phosphotransfer protein HPr from Streptococcus faecalis.,Jia Z, Vandonselaar M, Hengstenberg W, Quail JW, Delbaere LT J Mol Biol. 1994 Mar 11;236(5):1341-55. PMID:8126724^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Jia Z, Vandonselaar M, Hengstenberg W, Quail JW, Delbaere LT. The 1.6 A structure of histidine-containing phosphotransfer protein HPr from Streptococcus faecalis. J Mol Biol. 1994 Mar 11;236(5):1341-55. PMID:8126724

1 Structural highlights
2 Function
3 Evolutionary Conservation
4 Publication Abstract from PubMed
5 See Also
6 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/1ptf"

Categories: Enterococcus proteiformis thiercelin and jouhaud 1903 | Delbaere, L | Jia, Z | Quail, W | Phosphotransferase

@@ Line 2: / Line 2: @@
 <StructureSection load='1ptf' size='340' side='right' caption='[[1ptf]], [[Resolution|resolution]] 1.60&Aring;' scene=''>
 == Structural highlights ==
-<table><tr><td colspan='2'>[[1ptf]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Enterococcus_faecalis Enterococcus faecalis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1PTF OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1PTF FirstGlance]. <br>
+<table><tr><td colspan='2'>[[1ptf]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/"enterococcus_proteiformis"_thiercelin_and_jouhaud_1903 "enterococcus proteiformis" thiercelin and jouhaud 1903]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1PTF OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1PTF FirstGlance]. <br>
-</td></tr><tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1ptf FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ptf OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1ptf RCSB], [http://www.ebi.ac.uk/pdbsum/1ptf PDBsum]</span></td></tr>
+</td></tr><tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1ptf FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ptf OCA], [http://pdbe.org/1ptf PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1ptf RCSB], [http://www.ebi.ac.uk/pdbsum/1ptf PDBsum]</span></td></tr>
 </table>
 == Function ==
@@ Line 25: / Line 25: @@
 From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
 </div>
+<div class="pdbe-citations 1ptf" style="background-color:#fffaf0;"></div>
 ==See Also==
@@ Line 32: / Line 33: @@
 __TOC__
 </StructureSection>
-[[Category: Enterococcus faecalis]]
+[[Category: Enterococcus proteiformis thiercelin and jouhaud 1903]]
 [[Category: Delbaere, L]]
 [[Category: Jia, Z]]
 [[Category: Quail, W]]
 [[Category: Phosphotransferase]]

1ptf

From Proteopedia

Revision as of 23:03, 11 September 2015

THE 1.6 ANGSTROMS STRUCTURE OF HISTIDINE-CONTAINING PHOSPHOTRANSFER PROTEIN HPR FROM STREPTOCOCCUS FAECALIS

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

See Also

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

Personal tools

Navigation

Search

Toolbox