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(-) Description

Title :  HUMAN LACTOSE SYNTHASE: A 2:1 COMPLEX BETWEEN HUMAN ALPHA-LACTALBUMIN AND HUMAN BETA1,4-GALACTOSYLTRANSFERASE
 
Authors :  B. Ramakrishnan, P. K. Qasba
Date :  07 Jun 13  (Deposition) - 02 Oct 13  (Release) - 02 Oct 13  (Revision)
Method :  X-RAY DIFFRACTION
Resolution :  2.70
Chains :  Asym./Biol. Unit :  A,B,C
Keywords :  Gt-A Fold, Lactose Synthase, Substrate Binding, Golgi, Calcium Binding Protein-Transferase Complex (Keyword Search: [Gene Ontology, PubMed, Web (Google)] )
 
Reference :  B. Ramakrishnan, P. K. Qasba
Crystal Structure Of Human Lactose Synthase Forms A Novel 1:2 Complex Between Beta1, 4Galactosyltransferase 1 And Alpha-Lactalbumin Proteins
To Be Published
PubMed: search

(-) Compounds

Molecule 1 - ALPHA-LACTALBUMIN
    Chains: A, B
    Engineered: YES
    Expression System: ESCHERICHIA COLI
    Expression System Plasmid: PET23A
    Expression System Strain: BL21
    Expression System Taxid: 511693
    Expression System Vector Type: PLASMID
    Fragment: UNP RESIDUES 19-142
    Gene: 4-GALACTOSYLTRANSFERASE, BETA1, LALBA, LYZL7
    Organism Common: HUMAN
    Organism Scientific: HOMO SAPIENS
    Organism Taxid: 9606
    Synonym: LACTOSE SYNTHASE B PROTEIN, LYSOZYME-LIKE PROTEIN 7
 
Molecule 2 - BETA-1,4-GALACTOSYLTRANSFERASE 1
    Chains: C
    EC Number: 2.4.1.22
    Engineered: YES
    Expression System: ESCHERICHIA COLI
    Expression System Plasmid: PET17
    Expression System Strain: BL21
    Expression System Taxid: 511693
    Expression System Vector Type: PLASMID
    Fragment: UNP RESIDUES 126-398
    Gene: ALPHA-LACTALBUMIN, B4GALT1, GGTB2
    Mutation: YES
    Organism Common: HUMAN
    Organism Scientific: HOMO SAPIENS
    Organism Taxid: 9606
    Synonym: BETA-1,4-GALTASE 1, BETA4GAL-T1, B4GAL-T1

 Structural Features

(-) Chains, Units

  123
Asymmetric/Biological Unit : ABC

Summary Information (see also Sequences/Alignments below)

(-) Ligands, Modified Residues, Ions  (2, 3)

Asymmetric/Biological Unit (2, 3)
No.NameCountTypeFull Name
1CA2Ligand/IonCALCIUM ION
2SO41Ligand/IonSULFATE ION

(-) Sites  (3, 3)

Asymmetric Unit (3, 3)
No.NameEvidenceResiduesDescription
1AC1SOFTWARELYS A:80 , ASP A:83 , ASP A:85 , ASP A:88 , ASP A:89 , HOH A:302BINDING SITE FOR RESIDUE CA A 201
2AC2SOFTWAREGLU C:144 , PHE C:145 , ASN C:146 , ARG C:339 , ARG C:342BINDING SITE FOR RESIDUE SO4 C 401
3AC3SOFTWARELYS B:80 , PHE B:81 , ASP B:83 , ASP B:85 , ASP B:88 , ASP B:89BINDING SITE FOR RESIDUE CA B 201

(-) SS Bonds  (9, 9)

Asymmetric/Biological Unit
No.Residues
1A:7 -A:121
2A:29 -A:112
3A:74 -A:92
4B:7 -B:121
5B:29 -B:112
6B:62 -B:78
7B:74 -B:92
8C:130 -C:172
9C:243 -C:262

(-) Cis Peptide Bonds  (0, 0)

(no "Cis Peptide Bond" information available for 4L41)

 Sequence-Structure Mapping

(-) SAPs(SNPs)/Variants  (0, 0)

(no "SAP(SNP)/Variant" information available for 4L41)

(-) PROSITE Motifs  (0, 0)

(no "PROSITE Motif" information available for 4L41)

(-) Exons   (0, 0)

(no "Exon" information available for 4L41)

(-) 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:123
                                                                                                                                                           
               SCOP domains d4l41a_ A: automated matches                                                                                                SCOP domains
               CATH domains --------------------------------------------------------------------------------------------------------------------------- CATH domains
               Pfam domains --------------------------------------------------------------------------------------------------------------------------- Pfam domains
         Sec.struct. author ....hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh.....eee....eee....ee...................hhhhhh...hhhhhhhhhhhhhhhhhhhhhhhhhhh..hhhhhh... Sec.struct. author
                 SAPs(SNPs) --------------------------------------------------------------------------------------------------------------------------- SAPs(SNPs)
                    PROSITE --------------------------------------------------------------------------------------------------------------------------- PROSITE
                 Transcript --------------------------------------------------------------------------------------------------------------------------- Transcript
                 4l41 A   1 AKQFTKCELSQLLKDIDGYGGIALPELICTMFHTSGYDTQAIVENNESTEYGLFQISNKLWCKSSQVPQSRNICDISCDKFLDDDITDDIMCAKKILDIKGIDYWLAHKALCTEKLEQWLCEK 123
                                    10        20        30        40        50        60        70        80        90       100       110       120   


Chain B from PDB  Type:PROTEIN  Length:122
                                                                                                                                                          
               SCOP domains d4l41b_ B: automated matches                                                                                               SCOP domains
               CATH domains -------------------------------------------------------------------------------------------------------------------------- CATH domains
               Pfam domains -------------------------------------------------------------------------------------------------------------------------- Pfam domains
         Sec.struct. author ....hhhhhhhhhhhhh.....hhhhhhhhhhhhh......eee....eee....ee...................hhhhh....hhhhhhhhhhhhhhhhhhhhhhhhhhh...hhhhh.. Sec.struct. author
                 SAPs(SNPs) -------------------------------------------------------------------------------------------------------------------------- SAPs(SNPs)
                    PROSITE -------------------------------------------------------------------------------------------------------------------------- PROSITE
                 Transcript -------------------------------------------------------------------------------------------------------------------------- Transcript
                 4l41 B   1 AKQFTKCELSQLLKDIDGYGGIALPELICTMFHTSGYDTQAIVENNESTEYGLFQISNKLWCKSSQVPQSRNICDISCDKFLDDDITDDIMCAKKILDIKGIDYWLAHKALCTEKLEQWLCE 122
                                    10        20        30        40        50        60        70        80        90       100       110       120  


Chain C from PDB  Type:PROTEIN  Length:273
                                                                                                                                                                                                                                                                                                                 
               SCOP domains d4l41c_ C: automated matches                                                                                                                                                                                                                                                      SCOP domains
               CATH domains --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- CATH domains
               Pfam domains --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Pfam domains
         Sec.struct. author ........................hhhhhhhhh.......ee.........eeeeeeee..hhhhhhhhhhhhhhhhhhh..eeeeeeeee......hhhhhhhhhhhhhh......eeeee...eee.............ee...ee.hhh...........eeeeehhhhhhh...........hhhhhhhhhhhhh............eeee.....hhhhh...hhhhhhhhhhhhh..........eeeeeee....eeeeee..... Sec.struct. author
                 SAPs(SNPs) --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- SAPs(SNPs)
                    PROSITE --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- PROSITE
                 Transcript --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Transcript
                 4l41 C 126 SLPACPEESPLLVGPMLIEFNMPVDLELVAKQNPNVKMGGRYAPRDCVSPHKVAIIIPFRNRQEHLKYWLYYLHPVLQRQQLDYGIYVINQAGDTIFNRAKLLNVGFQEALKDYDYTCFVFSDVDLIPMNDHNAYRCFSQPRHISVAMDKFGFSLPYVQYFGGVSALSKQQFLTINGFPNNYWGWGGEDDDIFNRLVFRGMSISRPNAVVGTTRMIRHSRDKKNEPNPQRFDRIAHTKETMLSDGLNSLTYQVLDVQRYPLYTQITVDIGTPS 398
                                   135       145       155       165       175       185       195       205       215       225       235       245       255       265       275       285       295       305       315       325       335       345       355       365       375       385       395
   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 '|'

 Classification and Annotation

(-) SCOP Domains  (2, 3)

Asymmetric/Biological Unit
(-)
Class: Alpha and beta proteins (a+b) (23004)
(-)
Class: Alpha and beta proteins (a/b) (23833)

(-) CATH Domains  (0, 0)

(no "CATH Domain" information available for 4L41)

(-) Pfam Domains  (0, 0)

(no "Pfam Domain" information available for 4L41)

(-) Gene Ontology  (66, 72)

Asymmetric/Biological Unit(hide GO term definitions)

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  4l41
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  LALBA_HUMAN | P00709
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 Related Entries

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

UniProtKB/Swiss-Prot
        B4GT1_HUMAN | P15291: 2ae7 2aec 2aes 2agd 2ah9 2fy7 2fya 2fyb 3ee5 4ee3 4ee4 4ee5 4eea 4eeg 4eem 4eeo
        LALBA_HUMAN | P00709: 1a4v 1b9o 1cb3 1hml 3b0i 3b0o

(-) Related Entries Specified in the PDB File

1a4v CRYSTAL STRUCTURE OF HUMAN ALPHA-LACTALBUMIN
1nf5 CRYSTAL STRUCTURE OF A 1:1 COMPLEX BETWEEN MOUSE ALPHA- LACTALBUMIN AND BOVINE BETA1,4-GALACTOSYLTRANSFERASE IN THE PRESENCE OF GLUCOSE
2aec CRYSTAL STRUCTURE OF HUMAN BETA1,4GALACTOSYLTRANSFERASE
4krv