The Role of Carbonic Anhydrase in Photosynthesis

The Role of Carbonic Anhydrase in Photosynthesis Carbonic anhydrase (CA, EC 4.2.1.1) is a zinc-containing metalloenzyme that catalyzes the interconversion of C02 and HC03- in many organisms (Equa­ tion 1). 1. 0066-4294/94/0601-0369$05.00 BADGER & PRICE In the hydration reaction, C02 reacts with a Zn-OH intermediate at the active site of the enzyme. In the reverse dehydration direction, HC03 reacts with Zn-H20. This reaction has been studied cxtensively, particularly with CA enzymes from animal sources. Recent reviews cover extensively the mecha­ nistic functioning and evolutionary diversity of this enzyme (20, 94, 107). - Carbonic anhydrase is required in biological systems because the un­ catalyzed interconversion between C02 and HC03- is slow when compared to thc flux rates between these specics, which may bc required in living cells. For example, in a higher plant chloroplast, the rate of photosynthesis may ap­ proach 300 /lmol mg ChC 1 h-I. This is about 2.8 mM s-I, assuming a chloro­ I plast volume of 30 /-LI mg ChC . The uncatalyzed first-order rate constant for the conversion of C02 to HC03- is about 0.05 s I at 25 DC and pH 8 (57). Thus at present atmospheric C02 levels (350 ppm, leading to a chloroplast [C02] of about 8 /lM) http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Annual Review of Plant Biology Annual Reviews

The Role of Carbonic Anhydrase in Photosynthesis

Annual Review of Plant Biology, Volume 45 (1) – Jun 1, 1994

Loading next page...
 
/lp/annual-reviews/the-role-of-carbonic-anhydrase-in-photosynthesis-fkiWHRRitH
Publisher
Annual Reviews
Copyright
Copyright 1994 Annual Reviews. All rights reserved
Subject
Review Articles
ISSN
1040-2519
D.O.I.
10.1146/annurev.pp.45.060194.002101
Publisher site
See Article on Publisher Site

Abstract

Carbonic anhydrase (CA, EC 4.2.1.1) is a zinc-containing metalloenzyme that catalyzes the interconversion of C02 and HC03- in many organisms (Equa­ tion 1). 1. 0066-4294/94/0601-0369$05.00 BADGER & PRICE In the hydration reaction, C02 reacts with a Zn-OH intermediate at the active site of the enzyme. In the reverse dehydration direction, HC03 reacts with Zn-H20. This reaction has been studied cxtensively, particularly with CA enzymes from animal sources. Recent reviews cover extensively the mecha­ nistic functioning and evolutionary diversity of this enzyme (20, 94, 107). - Carbonic anhydrase is required in biological systems because the un­ catalyzed interconversion between C02 and HC03- is slow when compared to thc flux rates between these specics, which may bc required in living cells. For example, in a higher plant chloroplast, the rate of photosynthesis may ap­ proach 300 /lmol mg ChC 1 h-I. This is about 2.8 mM s-I, assuming a chloro­ I plast volume of 30 /-LI mg ChC . The uncatalyzed first-order rate constant for the conversion of C02 to HC03- is about 0.05 s I at 25 DC and pH 8 (57). Thus at present atmospheric C02 levels (350 ppm, leading to a chloroplast [C02] of about 8 /lM)

Journal

Annual Review of Plant BiologyAnnual Reviews

Published: Jun 1, 1994

There are no references for this article.

You’re reading a free preview. Subscribe to read the entire article.


DeepDyve is your
personal research library

It’s your single place to instantly
discover and read the research
that matters to you.

Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.

All for just $49/month

Explore the DeepDyve Library

Search

Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly

Organize

Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.

Access

Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.

Your journals are on DeepDyve

Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.

All the latest content is available, no embargo periods.

See the journals in your area

DeepDyve

Freelancer

DeepDyve

Pro

Price

FREE

$49/month
$360/year

Save searches from
Google Scholar,
PubMed

Create folders to
organize your research

Export folders, citations

Read DeepDyve articles

Abstract access only

Unlimited access to over
18 million full-text articles

Print

20 pages / month

PDF Discount

20% off