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(-) Description

Title :  SUGAR FREE LACTOSE PERMEASE AT ACIDIC PH
 
Authors :  O. Mirza, L. Guan, G. Verner, S. Iwata, H. R. Kaback
Date :  22 Feb 06  (Deposition) - 13 Mar 06  (Release) - 24 Feb 09  (Revision)
Method :  X-RAY DIFFRACTION
Resolution :  3.30
Chains :  Asym./Biol. Unit :  A
Keywords :  Transport, Lactose Permease, Transport Mechanism, Lactose/H+ Symport, Sugar Transport, Transmembrane, Formylation (Keyword Search: [Gene Ontology, PubMed, Web (Google)] )
 
Reference :  O. Mirza, L. Guan, G. Verner, S. Iwata, H. R. Kaback
Structural Evidence For Induced Fit And A Mechanism For Sugar/H(+) Symport In Lacy.
Embo J. V. 25 2038 2006
PubMed-ID: 16525509  |  Reference-DOI: 10.1038/SJ.EMBOJ.7601028

(-) Compounds

Molecule 1 - LACTOSE PERMEASE
    Chains: A
    Engineered: YES
    Expression System: ESCHERICHIA COLI
    Expression System Taxid: 562
    Mutation: YES
    Organism Scientific: ESCHERICHIA COLI
    Organism Taxid: 562
    Synonym: LACTOSE-PROTON SYMPORT

 Structural Features

(-) Chains, Units

  1
Asymmetric/Biological Unit : A

Summary Information (see also Sequences/Alignments below)

(-) Ligands, Modified Residues, Ions  (1, 5)

Asymmetric/Biological Unit (1, 5)
No.NameCountTypeFull Name
1HG5Ligand/IonMERCURY (II) ION

(-) Sites  (4, 4)

Asymmetric Unit (4, 4)
No.NameEvidenceResiduesDescription
1AC1SOFTWARECYS A:148BINDING SITE FOR RESIDUE HG A 501
2AC2SOFTWAREPHE A:21 , ILE A:22 , LEU A:172 , CYS A:176BINDING SITE FOR RESIDUE HG A 502
3AC3SOFTWARELEU A:57 , CYS A:355 , PHE A:356BINDING SITE FOR RESIDUE HG A 503
4AC4SOFTWAREILE A:230 , GLY A:231 , CYS A:234 , THR A:235 , MET A:365BINDING SITE FOR RESIDUE HG A 505

(-) SS Bonds  (0, 0)

(no "SS Bond" information available for 2CFP)

(-) Cis Peptide Bonds  (0, 0)

(no "Cis Peptide Bond" information available for 2CFP)

 Sequence-Structure Mapping

(-) SAPs(SNPs)/Variants  (0, 0)

(no "SAP(SNP)/Variant" information available for 2CFP)

(-) PROSITE Motifs  (3, 3)

Asymmetric/Biological Unit (3, 3)
 PROSITEUniProtKBPDB
No.IDACDescriptionIDLocationCountLocation
1MFSPS50850 Major facilitator superfamily (MFS) profile.LACY_ECOLI8-404  1A:8-404
2LACY_1PS00896 LacY family proton/sugar symporters signature 1.LACY_ECOLI64-78  1A:64-78
3LACY_2PS00897 LacY family proton/sugar symporters signature 2.LACY_ECOLI280-294  1A:280-294

(-) Exons   (0, 0)

(no "Exon" information available for 2CFP)

(-) Sequences/Alignments

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
(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 d2cfpa1 A:1-417 Lactose permease                                                                                                                                                                                                                                                                                                                                                                                                  SCOP domains
               CATH domains 2cfpA01 A:1-205 MFS general substrate transporter like domains                                                                                                                                               2cfpA02 A:206-417 MFS general substrate transporter like domains                                                                                                                                                     CATH domains
               Pfam domains --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Pfam domains
         Sec.struct. author ......hhhhhhh..hhhhhhhhh.....hhhhhhhhhh.hhhhhhhhhhhhhhh...hhhhhhhhhhhhh...hhhhhh......hhhhhhhhhhhhhh...hhhhhhh.........hhhhhhhhhhhhhhhhh..hhhhhhhhhhhhhhhhhhhhhhhhhhh.hhhhhh....hhhhhhhh........................hhhhhhhhh.hhhhhhhhhhhhhh..hhhhhhhhhhhhhhhh.....hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh..hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh...hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh................. 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
                 2cfp 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
   Legend:   → Mismatch (orange background)
  - → Gap (green background, '-', border residues have a numbering label)
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  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 '|'

 Classification and Annotation

(-) SCOP Domains  (1, 1)

Asymmetric/Biological Unit
(-)
Class: Membrane and cell surface proteins and peptides (2046)

(-) CATH Domains  (1, 2)

Asymmetric/Biological Unit
(-)
Class: Mainly Alpha (13335)

(-) Pfam Domains  (0, 0)

(no "Pfam Domain" information available for 2CFP)

(-) Gene Ontology  (14, 14)

Asymmetric/Biological Unit(hide GO term definitions)
Chain A   (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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 Related Entries

(-) Entries Sharing at Least One Protein Chain (UniProt ID)

UniProtKB/Swiss-Prot
        LACY_ECOLI | P02920: 1m2u 1pv6 1pv7 2cfq 2v8n 2y5y 4zyr 5gxb

(-) Related Entries Specified in the PDB File

1m2u STRUCTURE OF THE LACTOSE PERMEASE FROM NON- TRADITIONALCONSTRAINTS
1pv6 CRYSTAL STRUCTURE OF LACTOSE PERMEASE
1pv7 CRYSTAL STRUCTURE OF LACTOSE PERMEASE WITH TDG
2cfq SUGAR FREE LACTOSE PERMEASE AT NEUTRAL PH