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Title :   SQUALENE-HOPENE-CYCLASE FROM ALICYCLOBACILLUS ACIDOCALDARIUS

Authors :   K. U. Wendt, G. E. Schulz

Date :   01 Sep 97 (Deposition) - 17 Dec 97 (Release) - 24 Feb 09 (Revision)

Method :   X-RAY DIFFRACTION

Resolution :   2.85

Chains :   Asym./Biol. Unit : A

Keywords :   Isomerase, Membrane Protein, Terpenoid Metabolism, Squalene To Hopene (Hop-22, 29-Ene) And Diplopterol (Hopane-22-Ol) (Keyword Search: [Gene Ontology, PubMed, Web (Google)] )

Reference :   K. U. Wendt, K. Poralla, G. E. Schulz
Structure And Function Of A Squalene Cyclase.
Science V. 277 1811 1997
PubMed-ID: 9295270 | Reference-DOI: 10.1126/SCIENCE.277.5333.1811
(for further references see the PDB file header)

Molecule 1 - SQUALENE-HOPENE CYCLASE
	Atcc	:	27009
	Cellular Location	:	MEMBRANE
	Cell Line	:	JM105
	Chains	:	A
	EC Number	:	5.4.99.-
	Engineered	:	YES
	Expression System	:	ESCHERICHIA COLI K12
	Expression System Cellular Location	:	CYTOPLASMIC MEMBRANE
	Expression System Cell Line	:	JM105
	Expression System Plasmid	:	PKK223-3
	Expression System Strain	:	K12
	Expression System Taxid	:	83333
	Organism Scientific	:	ALICYCLOBACILLUS ACIDOCALDARIUS
	Organism Taxid	:	405212
	Other Details	:	THERMOSTABLE, ACIDOPHILIC

		1
Asymmetric/Biological Unit	:	A

Summary Information (see also Sequences/Alignments below)

Asymmetric/Biological Unit (1, 1)

No.	Name	Count	Type	Full Name
1	LDA	1	Ligand/Ion	LAURYL DIMETHYLAMINE-N-OXIDE

Asymmetric Unit (2, 2)

No.	Name	Evidence	Residues	Description
1	AC1	SOFTWARE	TRP A:312 , ASP A:374 , ASP A:376 , ASP A:377 , TYR A:420	BINDING SITE FOR RESIDUE LDA A 667
2	LDA	UNKNOWN	LDA A:667	THE ACTIVE SITE IS LOCATED IN A LARGE CENTRAL CAVITY, AS DEFINED BY THE INHIBITOR (LDA)BINDING SITE.

(no "SS Bond" information available for 1SQC)

(no "Cis Peptide Bond" information available for 1SQC)

(no "SAP(SNP)/Variant" information available for 1SQC)

Asymmetric/Biological Unit (1, 1)

	PROSITE			UniProtKB		PDB
No.	ID	AC	Description	ID	Location	Count	Location
1	TERPENE_SYNTHASES	PS01074	Terpene synthases signature.	SQHC_ALIAD	482-496	1	A:482-496

(no "Exon" information available for 1SQC)

Asymmetric/Biological Unit

Reformat:	Number of residues per line = ('0' or empty: single-line sequence representation)
	Number of residues per labelling interval =
	UniProt sequence: complete aligned part

Show mapping:	SCOP domains	CATH domains	Pfam domains	Secondary structure (by author)
	SAPs(SNPs)	PROSITE motifs	Exons
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Chain A from PDB  Type:PROTEIN  Length:619
 aligned with SQHC_ALIAD | P33247 from UniProtKB/Swiss-Prot  Length:631

    Alignment length:619
                                    19        29        39        49        59        69        79        89        99       109       119       129       139       149       159       169       179       189       199       209       219       229       239       249       259       269       279       289       299       309       319       329       339       349       359       369       379       389       399       409       419       429       439       449       459       469       479       489       499       509       519       529       539       549       559       569       579       589       599       609       619         
           SQHC_ALIAD    10 AYARTLDRAVEYLLSCQKDEGYWWGPLLSNVTMEAEYVLLCHILDRVDRDRMEKIRRYLLHEQREDGTWALYPGGPPDLDTTIEAYVALKYIGMSRDEEPMQKALRFIQSQGGIESSRVFTRMWLALVGEYPWEKVPMVPPEIMFLGKRMPLNIYEFGSWARATVVALSIVMSRQPVFPLPERARVPELYETDVPPRRRGAKGGGGWIFDALDRALHGYQKLSVHPFRRAAEIRALDWLLERQAGDGSWGGIQPPWFYALIALKILDMTQHPAFIKGWEGLELYGVELDYGGWMFQASISPVWDTGLAVLALRAAGLPADHDRLVKAGEWLLDRQITVPGDWAVKRPNLKPGGFAFQFDNVYYPDVDDTAVVVWALNTLRLPDERRRRDAMTKGFRWIVGMQSSNGGWGAYDVDNTSDLPNHIPFCDFGEVTDPPSEDVTAHVLECFGSFGYDDAWKVIRRAVEYLKREQKPDGSWFGRWGVNYLYGTGAVVSALKAVGIDTREPYIQKALDWVEQHQNPDGGWGEDCRSYEDPAYAGKGASTPSQTAWALMALIAGGRAESEAARRGVQYLVETQRPDGGWDEPYYTGTGFPGDFYLGYTMYRHVFPTLALGRYKQAI 628
               SCOP domains d1sqca1 A:10-36,A:308-628  d1sqca2 A:37-307 Squalene-hopene cyclase                                                                                                                                                                                                                                       d1sqca1 A:10-36,A:308-628 Squalene-hopene cyclase                                                                                                                                                                                                                                                                                 SCOP domains
               CATH domains 1sqcA01 A:10-35,A:308-628 1sqcA02 A:36-307  [code=1.50.10.20, no name defined]                                                                                                                                                                                                                            1sqcA01 A:10-35,A:308-628  [code=1.50.10.20, no name defined]                                                                                                                                                                                                                                                                     CATH domains
           Pfam domains (1) -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------Prenyltrans_2-1sqcA04 A:245-419                                                                                                                                                ----------------------------------------------------------------------------------------------Prenyltrans-1sqcA01 A:514-565                       --------------------------------------------------------------- Pfam domains (1)
           Pfam domains (2) ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------Prenyltrans-1sqcA02 A:514-565                       --------------------------------------------------------------- Pfam domains (2)
           Pfam domains (3) ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------Prenyltrans-1sqcA03 A:514-565                       --------------------------------------------------------------- Pfam domains (3)
         Sec.struct. author .hhhhhhhhhhhhhhh...............hhhhhhhhhhhhh....hhhhhhhhhhhhhh................hhhhhhhhhhhhhh......hhhhhhhhhhhhh..hhh..hhhhhhhhh.....hhh.....hhhhh........hhh..hhhhhhhhhhhhhh.........hhh..hhh.................hhhhhhhhhhhhhhh......hhhhhhhhhhhhhhh..........hhhhhhhhhhhhh......hhhhhhhhhhhhheee.....eee.....hhhhhhhhhhhhhhh......hhhhhhhhhhhhh......hhhh.....................hhhhhhhhhhhhh.....hhhhhhhhhhhhhhhhhh.................hhhh..............hhhhhhhhhhhhhh......hhhhhhhhhhhhh.............hhhhhhhhhhhhhhh.......hhhhhhhhhhhhh..........hhhh..hhh.......hhhhhhhhhhhhh......hhhhhhhhhhhhh.............eeee...eee....hhhhhhhhhhhhhhh.. Sec.struct. author
                 SAPs(SNPs) ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- SAPs(SNPs)
                    PROSITE ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------TERPENE_SYNTHAS------------------------------------------------------------------------------------------------------------------------------------ PROSITE
                 Transcript ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Transcript
                 1sqc A  10 AYARTLDRAVEYLLSCQKDEGYWWGPLLSNVTMEAEYVLLCHILDRVDRDRMEKIRRYLLHEQREDGTWALYPGGPPDLDTTIEAYVALKYIGMSRDEEPMQKALRFIQSQGGIESSRVFTRMWLALVGEYPWEKVPMVPPEIMFLGKRMPLNIYEFGSWARATVVALSIVMSRQPVFPLPERARVPELYETDVPPRRRGAKGGGGWIFDALDRALHGYQKLSVHPFRRAAEIRALDWLLERQAGDGSWGGIQPPWFYALIALKILDMTQHPAFIKGWEGLELYGVELDYGGWMFQASISPVWDTGLAVLALRAAGLPADHDRLVKAGEWLLDRQITVPGDWAVKRPNLKPGGFAFQFDNVYYPDVDDTAVVVWALNTLRLPDERRRRDAMTKGFRWIVGMQSSNGGWGAYDVDNTSDLPNHIPFCDFGEVTDPPSEDVTAHVLECFGSFGYDDAWKVIRRAVEYLKREQKPDGSWFGRWGVNYLYGTGAVVSALKAVGIDTREPYIQKALDWVEQHQNPDGGWGEDCRSYEDPAYAGKGASTPSQTAWALMALIAGGRAESEAARRGVQYLVETQRPDGGWDEPYYTGTGFPGDFYLGYTMYRHVFPTLALGRYKQAI 628
                                    19        29        39        49        59        69        79        89        99       109       119       129       139       149       159       169       179       189       199       209       219       229       239       249       259       269       279       289       299       309       319       329       339       349       359       369       379       389       399       409       419       429       439       449       459       469       479       489       499       509       519       529       539       549       559       569       579       589       599       609       619

Legend:		→ Mismatch	(orange background)
	-	→ Gap	(green background, '-', border residues have a numbering label)
		→ Modified Residue	(blue background, lower-case, 'x' indicates undefined single-letter code, labelled with number + name)
	x	→ Chemical Group	(purple background, 'x', labelled with number + name, e.g. ACE or NH2)
	extra numbering lines below/above indicate numbering irregularities and modified residue names etc., number ends below/above '\|'

Asymmetric/Biological Unit

Classes(

)

Folds(

)

Superfamilies( (-)

)

Families(

)

Protein Domains( (-)

)

Organisms( (-)

)

Class: All alpha proteins (14657)

Fold: alpha/alpha toroid (324)

Superfamily: Terpenoid cyclases/Protein prenyltransferases (151)

Family: Terpene synthases (18)

Protein domain: Squalene-hopene cyclase (16)

Alicyclobacillus acidocaldarius [TaxId: 405212] (16)

1a	d1sqca1	A:10-36,A:308-628
1b	d1sqca2	A:37-307

Asymmetric/Biological Unit

Classes(

)

Architectures( (-)

)

Topologies( (-)

)

Homologous Superfamilies( (-)

)

Organisms( (-)

)

Class: Mainly Alpha (13335)

Architecture: Alpha/alpha barrel (251)

Topology: Glycosyltransferase (233)

Homologous Superfamily: [code=1.50.10.20, no name defined] (105)

Alicyclobacillus acidocaldarius. Organism_taxid: 405212. Cell_line: jm105. (3)

1a	1sqcA01	A:10-35,A:308-628
1b	1sqcA02	A:36-307

Asymmetric/Biological Unit(hide GO term definitions)

Chain A (SQHC_ALIAD | P33247)

molecular function
	GO:0016866	intramolecular transferase activity	Catalysis of the transfer of a functional group from one position to another within a single molecule.
	GO:0016853	isomerase activity	Catalysis of the geometric or structural changes within one molecule. Isomerase is the systematic name for any enzyme of EC class 5.
	GO:0016829	lyase activity	Catalysis of the cleavage of C-C, C-O, C-N and other bonds by other means than by hydrolysis or oxidation, or conversely adding a group to a double bond. They differ from other enzymes in that two substrates are involved in one reaction direction, but only one in the other direction. When acting on the single substrate, a molecule is eliminated and this generates either a new double bond or a new ring.
	GO:0051007	squalene-hopene cyclase activity	Catalysis of the reaction: squalene = hop-22(29)-ene.
biological process
	GO:0019746	hopanoid biosynthetic process	The chemical reactions and pathways resulting in the formation of hopanoids, pentacyclic sterol-like compounds based on the hopane nucleus.
cellular component
	GO:0016020	membrane	A lipid bilayer along with all the proteins and protein complexes embedded in it an attached to it.
	GO:0005886	plasma membrane	The membrane surrounding a cell that separates the cell from its external environment. It consists of a phospholipid bilayer and associated proteins.

Asymmetric/Biological Unit
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