1cj0

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{{STRUCTURE_1cj0| PDB=1cj0 | SCENE= }}
{{STRUCTURE_1cj0| PDB=1cj0 | SCENE= }}
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'''CRYSTAL STRUCTURE OF RABBIT CYTOSOLIC SERINE HYDROXYMETHYLTRANSFERASE AT 2.8 ANGSTROM RESOLUTION'''
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===CRYSTAL STRUCTURE OF RABBIT CYTOSOLIC SERINE HYDROXYMETHYLTRANSFERASE AT 2.8 ANGSTROM RESOLUTION===
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==Overview==
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Serine hydroxymethyltransferase (SHMT) catalyzes the reversible cleavage of serine to form glycine and single carbon groups that are essential for many biosynthetic pathways. SHMT requires both pyridoxal phosphate (PLP) and tetrahydropteroylpolyglutamate (H4PteGlun) as cofactors, the latter as a carrier of the single carbon group. We describe here the crystal structure at 2.8 A resolution of rabbit cytosolic SHMT (rcSHMT) in two forms: one with the PLP covalently bound as an aldimine to the Nepsilon-amino group of the active site lysine and the other with the aldimine reduced to a secondary amine. The rcSHMT structure closely resembles the structure of human SHMT, confirming its similarity to the alpha-class of PLP enzymes. The structures reported here further permit identification of changes in the PLP group that accompany formation of the geminal diamine complex, the first intermediate in the reaction pathway. On the basis of the current mechanism derived from solution studies and the properties of site mutants, we are able to model the binding of both the serine substrate and the H4PteGlun cofactor. This model explains the properties of several site mutants of SHMT and offers testable hypotheses for a more detailed mechanism of this enzyme.
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(as it appears on PubMed at http://www.pubmed.gov), where 10387080 is the PubMed ID number.
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{{ABSTRACT_PUBMED_10387080}}
==About this Structure==
==About this Structure==
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[[Category: 1 carbon metabolism]]
[[Category: 1 carbon metabolism]]
[[Category: Hydroxymethyl transferase]]
[[Category: Hydroxymethyl transferase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 12:47:07 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jun 30 20:48:42 2008''

Revision as of 17:48, 30 June 2008

Image:1cj0.png

Template:STRUCTURE 1cj0

CRYSTAL STRUCTURE OF RABBIT CYTOSOLIC SERINE HYDROXYMETHYLTRANSFERASE AT 2.8 ANGSTROM RESOLUTION

Template:ABSTRACT PUBMED 10387080

About this Structure

1CJ0 is a Single protein structure of sequence from Oryctolagus cuniculus. Full crystallographic information is available from OCA.

Reference

Crystal structure of rabbit cytosolic serine hydroxymethyltransferase at 2.8 A resolution: mechanistic implications., Scarsdale JN, Kazanina G, Radaev S, Schirch V, Wright HT, Biochemistry. 1999 Jun 29;38(26):8347-58. PMID:10387080

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