626
Chlamydomonas
Tab. 2
Chloroplast genes of
C. reinhardtii
.
Genes involved in chloroplast gene expression
16S
16S rDNA
16S ribosomal RNA
23S, 7S, 3S
23S
a
, 7S, 3S rDNA
23S, 7S, 3S ribosomal RNA
5S
5S rDNA
5S ribosomal RNA
Trn
A,C
,D
,E,E1
,E2,F,G(2)
,H,I
,K,L(2)
,
M(3)
,N
,P
,Q,R
,R2,S(2)
,T,V
,W,Y
tRNAs
Rpl
2, 5, 14, 16, 20, 23, 36
Proteins of large ribosomal
subunit
Rps
2,3,4,7,8,9,12,14,18,19
Proteinsofsma
l
lribosoma
l
subunit
Rpo
A, B, C1a, C1b, C2
Subunits of RNA polymerase
tufA
Elongation factor EF-Tu
Genes involved in photosynthesis
psa
A
a
,B
,C
,JYc3,Yf4
Subun
itsofphotosystemI
Assembly factors of
photosystem I
Psb
A
a
,B
,C
,D
,E,F,H,J
,K,L,M,N
,T,Z
Subun
itsofphotosystemII
Pet
A,B
,D
,G,L
Subun
itsofcytochrome
b
6
f
complex
Atp
A,B
,E,F,H,I
Subun
itsofATPsynthase
rbcL
Large subunit of ribulose
1,5-bisphosphate carboxylase
Ch
l
B
,L,N
Subun
itsofl
ight-
independent
protochlorophyllide
oxidoreductase
Genes involved in other functions
clpP
Subunit of ATP-dependent
protease
ccsA
Involved in heme lyase
cemA
Protein required for facilitated
CO
2
/HCO
3
transport
Genes of unknown function
ycf12
Conserved in other plastid genomes
Function unknown
ORFs
27 ORFs speciĀ±c to
C. reinhardtii
Function unknown
a
Genes containing introns.
The arrangement of these genes on the chloroplast genome of
C. reinhardtii
is indicated in Fig. 3.
short dispersed repeats that account for
more than 20% of its sequence. More-
over, the chloroplast genes of
C. reinhardtii
are usually larger than their land plant
counterparts. While the organization of
these genes on the chloroplast genomes of
plants has been conserved to a remarkable
extent, this conservation does not extend
to Chlamydomonas. Even among
C. rein-
hardtii
,
C. eugametos
,a
n
d
C. moewusii
,
the arrangement of chloroplast genes is
rather different. The rearrangements of the
chloroplast genome appear to be correlated
with, and probably mediated through, the
short dispersed repeats.
Besides the numerous genes that are
found in plants and Chlamydomonas,
several chloroplast genes have been identi-
Fed in algae that are not present in the
chloroplast genomes from land plants.
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