54
V. K. Kannaujiya et al.
Table 3.2 Types of bilin lyase and site of action in chromophores (adapted and modified from
Kannaujiya et al. 2017c, d)
Lyase enzymes
Function
Site of catalysis
Cyanobacterium
References
CpcE/CpcF
PCB lyase
PC to Cys-84-αPC
PC to Cys-84-αPC
Synechococcus sp.
PCC 7002
Synechocystis sp.
PCC 6803
Nostoc sp. PCC
7120
Fairchild et al.
(1992)
Tooley et al.
(2001)
Zhao et al.
(2017)
PecE/PecF
PCB lyase
isomerase
PEC to
Cys-84-αPEC
Mastigocladus
laminosus
Storf et al.
(2001)
Zhao et al.
(2005)
CpcT/ CpeT
PCB lyase
PC to Cys-153-βPC
PCB to Cys 155 of
PecB
PEB at Cys-155 of
beta-PEI
Synechococcus sp.
PCC 7002
Anabaena sp. PCC
7120/
Nostoc sp. PCC
7120
Prochlorococcus
marinus MED4
Shen et al.
(2006)
Zhao et al.
(2007a, b)
Gasper et al.
(2017)
CpeS-I
PCB lyase
PC to Cys-84PC
PE to Cys-84PE,
PEC
PEB:Cys-80
beta-PE lyase
Nostoc sp. PCC
7120/
Anabaena sp. PCC
7120
Fremyella
diplosiphon strain
UTEX481
Zhao et al.
(2007a, b)
Biswas et al.
(2011)
CpeY/Z
PEB lyase
PEB to PE α or β
Fremyella
diplosiphon
(Kahn et al.
1997)
CpcS-III
PCB lyase
PC to Cys84-βPC
PEC to βPEC
APC to αAPC,
βAPC
Anabaena sp. PCC
7120/
Nostoc sp. PCC
7120
Zhao et al.
(2006)
Zhao et al.
(2007a, b)
CpcS-I/CpcU
PCB lyase
PC to Cys82-βPC;
APC to
Cys81-αAPC,
βAPC
Synechococcus sp.
PCC 7002
Saunée et al.
(2008)
Shen et al.
(2008)
of the PBPs (Kannaujiya and Sinha 2015). Long-term exposure of UV-B inhibits
the oxygen evolution and also disturbs PBPs composition in Synechococcus sp. by
partial uncoupling of energy transfer (Kulandaivelu et al. 1989). Sah et al. (1998)
reported that low dose of UVB irradiation altered the linker polypeptide (75 kDa)
in Synechococcus sp. 7942. Similarly, Rajagopal et al. (1998) reported that anchor
polypeptide was altered in PBPs of Spirulina platensis after UV-B irradiation. The
fluorescent nature of PC/PE is dependent on cysteine-linked integration of linear
tetrapyrrole chromophores in α and β monomers. The high intensity of PAR and