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1dtw

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[[Image:1dtw.gif|left|200px]]
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{{STRUCTURE_1dtw| PDB=1dtw | SCENE= }}
{{STRUCTURE_1dtw| PDB=1dtw | SCENE= }}
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'''HUMAN BRANCHED-CHAIN ALPHA-KETO ACID DEHYDROGENASE'''
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===HUMAN BRANCHED-CHAIN ALPHA-KETO ACID DEHYDROGENASE===
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==Overview==
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BACKGROUND: Mutations in components of the extraordinarily large alpha-ketoacid dehydrogenase multienzyme complexes can lead to serious and often fatal disorders in humans, including maple syrup urine disease (MSUD). In order to obtain insight into the effect of mutations observed in MSUD patients, we determined the crystal structure of branched-chain alpha-ketoacid dehydrogenase (E1), the 170 kDa alpha(2)beta(2) heterotetrameric E1b component of the branched-chain alpha-ketoacid dehydrogenase multienzyme complex. RESULTS: The 2.7 A resolution crystal structure of human E1b revealed essentially the full alpha and beta polypeptide chains of the tightly packed heterotetramer. The position of two important potassium (K(+)) ions was determined. One of these ions assists a loop that is close to the cofactor to adopt the proper conformation. The second is located in the beta subunit near the interface with the small C-terminal domain of the alpha subunit. The known MSUD mutations affect the functioning of E1b by interfering with the cofactor and K(+) sites, the packing of hydrophobic cores, and the precise arrangement of residues at or near several subunit interfaces. The Tyr--&gt;Asn mutation at position 393-alpha occurs very frequently in the US population of Mennonites and is located in a unique extension of the human E1b alpha subunit, contacting the beta' subunit. CONCLUSIONS: Essentially all MSUD mutations in human E1b can be explained on the basis of the structure, with the severity of the mutations for the stability and function of the protein correlating well with the severity of the disease for the patients. The suggestion is made that small molecules with high affinity for human E1b might alleviate effects of some of the milder forms of MSUD.
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{{ABSTRACT_PUBMED_10745006}}
==About this Structure==
==About this Structure==
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[[Category: Branched-chain alpha-keto acid dehydrogenase]]
[[Category: Branched-chain alpha-keto acid dehydrogenase]]
[[Category: Thdp-binding fold]]
[[Category: Thdp-binding fold]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jun 30 23:36:36 2008''

Revision as of 20:36, 30 June 2008

Image:1dtw.png

Template:STRUCTURE 1dtw

HUMAN BRANCHED-CHAIN ALPHA-KETO ACID DEHYDROGENASE

Template:ABSTRACT PUBMED 10745006

About this Structure

1DTW is a Protein complex structure of sequences from Homo sapiens. Full crystallographic information is available from OCA.

Reference

Crystal structure of human branched-chain alpha-ketoacid dehydrogenase and the molecular basis of multienzyme complex deficiency in maple syrup urine disease., AEvarsson A, Chuang JL, Wynn RM, Turley S, Chuang DT, Hol WG, Structure. 2000 Mar 15;8(3):277-91. PMID:10745006

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