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2bsa

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[[Image:2bsa.gif|left|200px]]
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{{STRUCTURE_2bsa| PDB=2bsa | SCENE= }}
{{STRUCTURE_2bsa| PDB=2bsa | SCENE= }}
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'''FERREDOXIN-NADP REDUCTASE (MUTATION: Y 303 S) COMPLEXED WITH NADP'''
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===FERREDOXIN-NADP REDUCTASE (MUTATION: Y 303 S) COMPLEXED WITH NADP===
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==Overview==
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Ferredoxin-NADP+ reductase (FNR) catalyzes the reduction of NADP+ to NADPH in an overall reversible reaction, showing some differences in the mechanisms between cyanobacterial and higher plant FNRs. During hydride transfer it is proposed that the FNR C-terminal Tyr is displaced by the nicotinamide. Thus, this C-terminal Tyr might be involved not only in modulating the flavin redox properties, as already shown, but also in nicotinamide binding and hydride transfer. FNR variants from the cyanobacterium Anabaena in which the C-terminal Tyr has been replaced by Trp, Phe, or Ser have been produced. All FNR variants show enhanced NADP+ and NAD+ binding, especially Tyr303Ser, which correlates with a noticeable improvement of NADH-dependent reactions. Nevertheless, the Tyr303Ser variant shows a decrease in the steady-state kcat value with NADPH. Fast kinetic analysis of the hydride transfer shows that the low efficiency observed for this mutant FNR under steady-state conditions is not due to a lack of catalytic ability but rather to the strong enzyme-coenzyme interaction. Three-dimensional structures for Tyr303Ser and Tyr303Trp variants and its complexes with NADP+ show significant differences between plant and cyanobacterial FNRs. Our results suggest that modulation of coenzyme affinity is highly influenced by the strength of the C-terminus-FAD interaction and that subtle changes between plant and cyanobacterial structures are able to modify the energy of that interaction. Additionally, it is shown that the C-terminal Tyr of FNR lowers the affinity for NADP+/H to levels compatible with steady-state turnover during the catalytic cycle, but it is not involved in the hydride transfer itself.
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{{ABSTRACT_PUBMED_16216071}}
==About this Structure==
==About this Structure==
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[[Category: Phycobilisome]]
[[Category: Phycobilisome]]
[[Category: Thylakoid]]
[[Category: Thylakoid]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 20:43:48 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 17:30:39 2008''

Revision as of 14:30, 28 July 2008

Image:2bsa.png

Template:STRUCTURE 2bsa

FERREDOXIN-NADP REDUCTASE (MUTATION: Y 303 S) COMPLEXED WITH NADP

Template:ABSTRACT PUBMED 16216071

About this Structure

2BSA is a Single protein structure of sequence from Anabaena sp.. Full crystallographic information is available from OCA.

Reference

C-terminal tyrosine of ferredoxin-NADP+ reductase in hydride transfer processes with NAD(P)+/H., Tejero J, Perez-Dorado I, Maya C, Martinez-Julvez M, Sanz-Aparicio J, Gomez-Moreno C, Hermoso JA, Medina M, Biochemistry. 2005 Oct 18;44(41):13477-90. PMID:16216071

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