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Title :   CRYSTAL STRUCTURE OF LACTOSE PERMEASE

Authors :   J. Abramson, I. Smirnova, V. Kasho, G. Verner, H. R. Kaback, S. Iwata

Date :   26 Jun 03 (Deposition) - 12 Aug 03 (Release) - 24 Feb 09 (Revision)

Method :   X-RAY DIFFRACTION

Resolution :   3.50

Chains :   Asym. Unit : A,B
Biol. Unit 1: A  (1x)
Biol. Unit 2: B  (1x)

Keywords :   Transport, Sugar Transport, Symport, Membrane Protein, Transport Protein (Keyword Search: [Gene Ontology, PubMed, Web (Google)] )

Reference :   J. Abramson, I. Smirnova, V. Kasho, G. Verner, H. R. Kaback, S. Iwata
Structure And Mechanism Of The Lactose Permease Of Escherichia Coli
Science V. 301 610 2003
PubMed-ID: 12893935 | Reference-DOI: 10.1126/SCIENCE.1088196
(for further references see the PDB file header)

Molecule 1 - LACTOSE PERMEASE
	Chains	:	A, B
	Engineered	:	YES
	Expression System	:	ESCHERICHIA COLI
	Expression System Taxid	:	562
	Mutation	:	YES
	Organism Scientific	:	ESCHERICHIA COLI
	Organism Taxid	:	562

		1	2
Asymmetric Unit	:	A	B
Biological Unit 1 (1x)	:	A
Biological Unit 2 (1x)	:		B

Summary Information (see also Sequences/Alignments below)

(no "Ligand,Modified Residues,Ions" information available for 1PV6)

(no "Site" information available for 1PV6)

(no "SS Bond" information available for 1PV6)

(no "Cis Peptide Bond" information available for 1PV6)

(no "SAP(SNP)/Variant" information available for 1PV6)

Asymmetric Unit (3, 6)

	PROSITE			UniProtKB		PDB
No.	ID	AC	Description	ID	Location	Count	Location
1	MFS	PS50850	Major facilitator superfamily (MFS) profile.	LACY_ECOLI	8-404	2	A:8-404 B:8-404
2	LACY_1	PS00896	LacY family proton/sugar symporters signature 1.	LACY_ECOLI	64-78	2	A:64-78 B:64-78
3	LACY_2	PS00897	LacY family proton/sugar symporters signature 2.	LACY_ECOLI	280-294	2	A:280-294 B:280-294

Biological Unit 1 (3, 3)

	PROSITE			UniProtKB		PDB
No.	ID	AC	Description	ID	Location	Count	Location
1	MFS	PS50850	Major facilitator superfamily (MFS) profile.	LACY_ECOLI	8-404	1	A:8-404 -
2	LACY_1	PS00896	LacY family proton/sugar symporters signature 1.	LACY_ECOLI	64-78	1	A:64-78 -
3	LACY_2	PS00897	LacY family proton/sugar symporters signature 2.	LACY_ECOLI	280-294	1	A:280-294 -

Biological Unit 2 (3, 3)

	PROSITE			UniProtKB		PDB
No.	ID	AC	Description	ID	Location	Count	Location
1	MFS	PS50850	Major facilitator superfamily (MFS) profile.	LACY_ECOLI	8-404	1	- B:8-404
2	LACY_1	PS00896	LacY family proton/sugar symporters signature 1.	LACY_ECOLI	64-78	1	- B:64-78
3	LACY_2	PS00897	LacY family proton/sugar symporters signature 2.	LACY_ECOLI	280-294	1	- B:280-294

(no "Exon" information available for 1PV6)

Asymmetric 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
	(details for a mapped element are shown in a popup box when the mouse pointer rests over it)

Chain A from PDB  Type:PROTEIN  Length:417
 aligned with LACY_ECOLI | P02920 from UniProtKB/Swiss-Prot  Length:417

    Alignment length:417
                                    10        20        30        40        50        60        70        80        90       100       110       120       130       140       150       160       170       180       190       200       210       220       230       240       250       260       270       280       290       300       310       320       330       340       350       360       370       380       390       400       410       
           LACY_ECOLI     1 MYYLKNTNFWMFGLFFFFYFFIMGAYFPFFPIWLHDINHISKSDTGIIFAAISLFSLLFQPLFGLLSDKLGLRKYLLWIITGMLVMFAPFFIFIFGPLLQYNILVGSIVGGIYLGFCFNAGAPAVEAFIEKVSRRSNFEFGRARMFGCVGWALCASIVGIMFTINNQFVFWLGSGCALILAVLLFFAKTDAPSSATVANAVGANHSAFSLKLALELFRQPKLWFLSLYVIGVSCTYDVFDQQFANFFTSFFATGEQGTRVFGYVTTMGELLNASIMFFAPLIINRIGGKNALLLAGTIMSVRIIGSSFATSALEVVILKTLHMFEVPFLLVGCFKYITSQFEVRFSATIYLVCFCFFKQLAMIFMSVLAGNMYESIGFQGAYLVLGLVALGFTLISVFTLSGPGPLSLLRRQVNEVA 417
               SCOP domains d1pv6a_ A: Lactose permease                                                                                                                                                                                                                                                                                                                                                                                                       SCOP domains
               CATH domains 1pv6A01 A:1-205 MFS general substrate transporter like domains                                                                                                                                               1pv6A02 A:206-417 MFS general substrate transporter like domains                                                                                                                                                     CATH domains
               Pfam domains --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Pfam domains
         Sec.struct. author hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh.hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh..hhhhhhhhhhhhhhhhhhhhhhhhhhhh.hhhhhhhhhh.......hhhhhhhhhhhhhhhhhh.hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh......................hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh....hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh..hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh.hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh......hhhhhhhhhhh Sec.struct. author
                 SAPs(SNPs) --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- SAPs(SNPs)
                PROSITE (1) -------MFS  PDB: A:8-404 UniProt: 8-404                                                                                                                                                                                                                                                                                                                                                                             ------------- PROSITE (1)
                PROSITE (2) ---------------------------------------------------------------LACY_1         ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------LACY_2         --------------------------------------------------------------------------------------------------------------------------- PROSITE (2)
                 Transcript --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Transcript
                 1pv6 A   1 MYYLKNTNFWMFGLFFFFYFFIMGAYFPFFPIWLHDINHISKSDTGIIFAAISLFSLLFQPLFGLLSDKLGLRKYLLWIITGMLVMFAPFFIFIFGPLLQYNILVGSIVGGIYLGFCFNAGAPAVEAFIEKVSRRSNFEFGRARMFGCVGWALGASIVGIMFTINNQFVFWLGSGCALILAVLLFFAKTDAPSSATVANAVGANHSAFSLKLALELFRQPKLWFLSLYVIGVSCTYDVFDQQFANFFTSFFATGEQGTRVFGYVTTMGELLNASIMFFAPLIINRIGGKNALLLAGTIMSVRIIGSSFATSALEVVILKTLHMFEVPFLLVGCFKYITSQFEVRFSATIYLVCFCFFKQLAMIFMSVLAGNMYESIGFQGAYLVLGLVALGFTLISVFTLSGPGPLSLLRRQVNEVA 417
                                    10        20        30        40        50        60        70        80        90       100       110       120       130       140       150       160       170       180       190       200       210       220       230       240       250       260       270       280       290       300       310       320       330       340       350       360       370       380       390       400       410

Chain B from PDB  Type:PROTEIN  Length:417
 aligned with LACY_ECOLI | P02920 from UniProtKB/Swiss-Prot  Length:417

    Alignment length:417
                                    10        20        30        40        50        60        70        80        90       100       110       120       130       140       150       160       170       180       190       200       210       220       230       240       250       260       270       280       290       300       310       320       330       340       350       360       370       380       390       400       410       
           LACY_ECOLI     1 MYYLKNTNFWMFGLFFFFYFFIMGAYFPFFPIWLHDINHISKSDTGIIFAAISLFSLLFQPLFGLLSDKLGLRKYLLWIITGMLVMFAPFFIFIFGPLLQYNILVGSIVGGIYLGFCFNAGAPAVEAFIEKVSRRSNFEFGRARMFGCVGWALCASIVGIMFTINNQFVFWLGSGCALILAVLLFFAKTDAPSSATVANAVGANHSAFSLKLALELFRQPKLWFLSLYVIGVSCTYDVFDQQFANFFTSFFATGEQGTRVFGYVTTMGELLNASIMFFAPLIINRIGGKNALLLAGTIMSVRIIGSSFATSALEVVILKTLHMFEVPFLLVGCFKYITSQFEVRFSATIYLVCFCFFKQLAMIFMSVLAGNMYESIGFQGAYLVLGLVALGFTLISVFTLSGPGPLSLLRRQVNEVA 417
               SCOP domains d1pv6b_ B: Lactose permease                                                                                                                                                                                                                                                                                                                                                                                                       SCOP domains
               CATH domains 1pv6B01 B:1-205 MFS general substrate transporter like domains                                                                                                                                               1pv6B02 B:206-417 MFS general substrate transporter like domains                                                                                                                                                     CATH domains
           Pfam domains (1) LacY_symp-1pv6B01 B:1-413                                                                                                                                                                                                                                                                                                                                                                                                    ---- Pfam domains (1)
           Pfam domains (2) LacY_symp-1pv6B02 B:1-413                                                                                                                                                                                                                                                                                                                                                                                                    ---- Pfam domains (2)
         Sec.struct. author hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh.hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh..hhhhhhhhhhhhhhhhhhhhhhhhhhhh.hhhhhhhhhh.......hhhhhhhhhhhhhhhhhh.hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh......................hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh....hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh..hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh.hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh......hhhhhhhhhhh Sec.struct. author
                 SAPs(SNPs) --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- SAPs(SNPs)
                PROSITE (1) -------MFS  PDB: B:8-404 UniProt: 8-404                                                                                                                                                                                                                                                                                                                                                                             ------------- PROSITE (1)
                PROSITE (2) ---------------------------------------------------------------LACY_1         ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------LACY_2         --------------------------------------------------------------------------------------------------------------------------- PROSITE (2)
                 Transcript --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Transcript
                 1pv6 B   1 MYYLKNTNFWMFGLFFFFYFFIMGAYFPFFPIWLHDINHISKSDTGIIFAAISLFSLLFQPLFGLLSDKLGLRKYLLWIITGMLVMFAPFFIFIFGPLLQYNILVGSIVGGIYLGFCFNAGAPAVEAFIEKVSRRSNFEFGRARMFGCVGWALGASIVGIMFTINNQFVFWLGSGCALILAVLLFFAKTDAPSSATVANAVGANHSAFSLKLALELFRQPKLWFLSLYVIGVSCTYDVFDQQFANFFTSFFATGEQGTRVFGYVTTMGELLNASIMFFAPLIINRIGGKNALLLAGTIMSVRIIGSSFATSALEVVILKTLHMFEVPFLLVGCFKYITSQFEVRFSATIYLVCFCFFKQLAMIFMSVLAGNMYESIGFQGAYLVLGLVALGFTLISVFTLSGPGPLSLLRRQVNEVA 417
                                    10        20        30        40        50        60        70        80        90       100       110       120       130       140       150       160       170       180       190       200       210       220       230       240       250       260       270       280       290       300       310       320       330       340       350       360       370       380       390       400       410

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 Unit

Classes(

)

Folds(

)

Superfamilies( (-)

)

Families(

)

Protein Domains( (-)

)

Organisms( (-)

)

Class: Membrane and cell surface proteins and peptides (2046)

Fold: MFS general substrate transporter (5)

Superfamily: MFS general substrate transporter (5)

Family: LacY-like proton/sugar symporter (4)

Protein domain: Lactose permease (3)

Escherichia coli [TaxId: 562] (3)

1a	d1pv6a_	A:
1b	d1pv6b_	B:

Asymmetric Unit

Classes(

)

Architectures( (-)

)

Topologies( (-)

)

Homologous Superfamilies( (-)

)

Organisms( (-)

)

Class: Mainly Alpha (13335)

Architecture: Up-down Bundle (3216)

Topology: Growth Hormone; Chain: A; (136)

Homologous Superfamily: MFS general substrate transporter like domains (6)

Escherichia coli. Organism_taxid: 562. (5)

1a	1pv6A02	A:206-417
1b	1pv6A01	A:1-205
1c	1pv6B01	B:1-205
1d	1pv6B02	B:206-417

Asymmetric Unit

Clans(

)

Families(

)

Organisms( (-)

)

Clan: MFS (8)

Family: LacY_symp (4)

Escherichia coli (strain K12) (4)

1a	LacY_symp-1pv6B01	B:1-413
1b	LacY_symp-1pv6B02	B:1-413

Asymmetric Unit(hide GO term definitions)

Chain A,B (LACY_ECOLI | P02920)

molecular function
	GO:0030395	lactose binding	Interacting selectively and non-covalently with lactose, a disaccharide of glucose and galactose, the carbohydrate of milk.
	GO:0015528	lactose:proton symporter activity	Catalysis of the transfer of a solute or solutes from one side of a membrane to the other according to the reaction: lactose(out) + H+(out) = lactose(in) + H+(in).
	GO:0005515	protein binding	Interacting selectively and non-covalently with any protein or protein complex (a complex of two or more proteins that may include other nonprotein molecules).
	GO:0005351	sugar:proton symporter activity	Catalysis of the transfer of a solute or solutes from one side of a membrane to the other according to the reaction: sugar(out) + H+(out) = sugar(in) + H+(in).
	GO:0015293	symporter activity	Enables the active transport of a solute across a membrane by a mechanism whereby two or more species are transported together in the same direction in a tightly coupled process not directly linked to a form of energy other than chemiosmotic energy.
biological process
	GO:0008643	carbohydrate transport	The directed movement of carbohydrate into, out of or within a cell, or between cells, by means of some agent such as a transporter or pore. Carbohydrates are any of a group of organic compounds based of the general formula Cx(H2O)y.
	GO:0015767	lactose transport	The directed movement of lactose into, out of or within a cell, or between cells, by means of some agent such as a transporter or pore. Lactose is a disaccharide 4-O-beta-D-galactopyranosyl-D-glucose, and constitutes roughly 5% of the milk in almost all mammals.
	GO:0015992	proton transport	The directed movement of protons (hydrogen ions) into, out of or within a cell, or between cells, by means of some agent such as a transporter or pore.
	GO:0055085	transmembrane transport	The process in which a solute is transported across a lipid bilayer, from one side of a membrane to the other
	GO:0006810	transport	The directed movement of substances (such as macromolecules, small molecules, ions) or cellular components (such as complexes and organelles) into, out of or within a cell, or between cells, or within a multicellular organism by means of some agent such as a transporter, pore or motor protein.
cellular component
	GO:0016021	integral component of membrane	The component of a membrane consisting of the gene products and protein complexes having at least some part of their peptide sequence embedded in the hydrophobic region of the membrane.
	GO:0005887	integral component of plasma membrane	The component of the plasma membrane consisting of the gene products and protein complexes having at least some part of their peptide sequence embedded in the hydrophobic region of the membrane.
	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.

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	1pv6
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1pv7	THE SAME PROTEIN COMPLEXED WITH TDG

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