1B3E image
Deposition Date 1998-12-09
Release Date 1999-03-26
Last Version Date 2024-10-30
Entry Detail
PDB ID:
1B3E
Keywords:
Title:
HUMAN SERUM TRANSFERRIN, N-TERMINAL LOBE, EXPRESSED IN PICHIA PASTORIS
Biological Source:
Source Organism:
Homo sapiens (Taxon ID: 9606)
Host Organism:
Method Details:
Experimental Method:
Resolution:
2.50 Å
R-Value Free:
0.25
R-Value Work:
0.17
Space Group:
P 41 21 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:PROTEIN (SERUM TRANSFERRIN)
Gene (Uniprot):TF
Chain IDs:A
Chain Length:330
Number of Molecules:1
Biological Source:Homo sapiens
Primary Citation
X-ray crystallography and mass spectroscopy reveal that the N-lobe of human transferrin expressed in Pichia pastoris is folded correctly but is glycosylated on serine-32.
Biochemistry 38 2535 2541 (1999)
PMID: 10029548 DOI: 10.1021/bi9824543

Abstact

The ferric form of the N-lobe of human serum transferrin (Fe(III)-hTF/2N) has been expressed at high levels in Pichia pastoris. The Fe(III)-hTF/2N was crystallized in the space group P41212, and X-ray crystallography was used to solve the structure of the recombinant protein at 2.5 A resolution. This represents only the second P. pastoris-derived protein structure determined to date, and allows the comparison of the structures of recombinant Fe(III)-hTF/2N expressed in P. pastoris and mammalian cells with serum-derived transferrin. The polypeptide folding pattern is essentially identical in all of the three proteins. Mass spectroscopic analyses of P. pastoris- hTF/2N and proteolytically derived fragments revealed glycosylation of Ser-32 with a single hexose. This represents the first localization of an O-linked glycan in a P. pastoris-derived protein. Because of its distance from the iron-binding site, glycosylation of Ser-32 should not affect the iron-binding properties of hTF/2N expressed in P. pastoris, making this an excellent expression system for the production of hTF/2N.

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