1pnk: Difference between revisions

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[[Image:1pnk.gif|left|200px]]


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==PENICILLIN ACYLASE HAS A SINGLE-AMINO-ACID CATALYTIC CENTRE==
The line below this paragraph, containing "STRUCTURE_1pnk", creates the "Structure Box" on the page.
<StructureSection load='1pnk' size='340' side='right'caption='[[1pnk]], [[Resolution|resolution]] 1.90&Aring;' scene=''>
You may change the PDB parameter (which sets the PDB file loaded into the applet)
== Structural highlights ==
or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
<table><tr><td colspan='2'>[[1pnk]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1PNK OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1PNK FirstGlance]. <br>
or leave the SCENE parameter empty for the default display.
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.9&#8491;</td></tr>
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<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene></td></tr>
{{STRUCTURE_1pnk| PDB=1pnk |  SCENE= }}
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1pnk FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1pnk OCA], [https://pdbe.org/1pnk PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1pnk RCSB], [https://www.ebi.ac.uk/pdbsum/1pnk PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1pnk ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/PAC_ECOLX PAC_ECOLX]
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/pn/1pnk_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=1pnk ConSurf].
<div style="clear:both"></div>


'''PENICILLIN ACYLASE HAS A SINGLE-AMINO-ACID CATALYTIC CENTRE'''
==See Also==
 
*[[Penicillin acylase|Penicillin acylase]]
 
__TOC__
==Overview==
</StructureSection>
Penicillin acylase (penicillin amidohydrolase, EC 3.5.1.11) is widely distributed among microorganisms, including bacteria, yeast and filamentous fungi. It is used on an industrial scale for the production of 6-aminopenicillanic acid, the starting material for the synthesis of semi-synthetic penicillins. Its in vivo role remains unclear, however, and the observation that expression of the Escherichia coli enzyme in vivo is regulated by both temperature and phenylacetic acid has prompted speculation that the enzyme could be involved in the assimilation of aromatic compounds as carbon sources in the organism's free-living mode. The mature E. coli enzyme is a periplasmic 80K heterodimer of A and B chains (209 and 566 amino acids, respectively) synthesized as a single cytoplasmic precursor containing a 26-amino-acid signal sequence to direct export to the cytoplasm and a 54-amino-acid spacer between the A and B chains which may influence the final folding of the chains. The N-terminal serine of the B chain reacts with phenylmethylsulphonyl fluoride, which is consistent with a catalytic role for the serine hydroxyl group. Modifying this serine to a cysteine inactivates the enzyme, whereas threonine, arginine or glycine substitution prevents in vivo processing of the enzyme, indicating that this must be an important recognition site for cleavage. Here we report the crystal structure of penicillin acylase at 1.9 A resolution. Our analysis shows that the environment of the catalytically active N-terminal serine of the B chain contains no adjacent histidine equivalent to that found in the serine proteases. The nearest base to the hydroxyl of this serine is its own alpha-amino group, which may act by a new mechanism to endow the enzyme with its catalytic properties.
 
==About this Structure==
1PNK is a [[Protein complex]] structure of sequences from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1PNK OCA].
 
==Reference==
Penicillin acylase has a single-amino-acid catalytic centre., Duggleby HJ, Tolley SP, Hill CP, Dodson EJ, Dodson G, Moody PC, Nature. 1995 Jan 19;373(6511):264-8. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/7816145 7816145]
[[Category: Escherichia coli]]
[[Category: Escherichia coli]]
[[Category: Penicillin amidase]]
[[Category: Large Structures]]
[[Category: Protein complex]]
[[Category: Duggleby HJ]]
[[Category: Duggleby, H J.]]
[[Category: Moody PCE]]
[[Category: Moody, P C.E.]]
[[Category: Antibiotic resistance]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May  3 05:16:56 2008''

Latest revision as of 11:09, 14 February 2024

PENICILLIN ACYLASE HAS A SINGLE-AMINO-ACID CATALYTIC CENTREPENICILLIN ACYLASE HAS A SINGLE-AMINO-ACID CATALYTIC CENTRE

Structural highlights

1pnk is a 2 chain structure with sequence from Escherichia coli. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:X-ray diffraction, Resolution 1.9Å
Ligands:
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

PAC_ECOLX

Evolutionary Conservation

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

See Also

1pnk, resolution 1.90Å

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