How many exonucleases have been discovered?

[Mazda Hewitt]

I checked swissprot for you and I get 48 different enzymes.

Search in SWISS-PROT for: exonuclease

(Release 34.0 and updates up to Feb-10-1997)

     Number of sequences found: 48
     Note that the selected sequences can be saved to a file to be later
retrieved; to
     do so, go to the bottom of this page. 

Please choose one of the following entries: 

EX1_ECOLI
     EXODEOXYRIBONUCLEASE I (EC 3.1.11.1) (EXONUCLEASE I)
     (DNA DEOXYRIBOPHOSPHODIESTERASE) (DRPASE) {GENE:
     SBCB OR XONA OR CPEA} 
EX1_HAEIN
     EXODEOXYRIBONUCLEASE I (EC 3.1.11.1) (EXONUCLEASE I)
     (DNA DEOXYRIBOPHOSPHODIESTERASE) (DRPASE) {GENE:
     SBCB OR HI1377} 
EX3_ECOLI
     EXODEOXYRIBONUCLEASE III (EC 3.1.11.2) (EXONUCLEASE III)
     (AP ENDONUCLEASE VI) {GENE: XTHA OR XTH} 
EX3_HAEIN
     EXODEOXYRIBONUCLEASE III (EC 3.1.11.2) (EXONUCLEASE III)
     {GENE: XTHA OR HI0041} 
EX5A_ECOLI
     EXODEOXYRIBONUCLEASE V 67 KD POLYPEPTIDE (EC 3.1.11.5)
     (EXONUCLEASE V ALPHA CHAIN) {GENE: RECD} 
EX5B_ECOLI
     EXODEOXYRIBONUCLEASE V 135 KD POLYPEPTIDE (EC 3.1.11.5)
     (EXONUCLEASE V BETA CHAIN) {GENE: RECB OR RORA} 
EX5C_ECOLI
     EXODEOXYRIBONUCLEASE V 125 KD POLYPEPTIDE (EC 3.1.11.5)
     (EXONUCLEASE V GAMMA CHAIN) {GENE: RECC} 
EX7L_BACSU
     PUTATIVE EXODEOXYRIBONUCLEASE LARGE SUBUNIT (EC
     3.1.11.6) (EXONUCLEASE VII LARGE SUBUNIT) {GENE: YQIB} 
EX7L_ECOLI
     EXODEOXYRIBONUCLEASE LARGE SUBUNIT (EC 3.1.11.6)
     (EXONUCLEASE VII LARGE SUBUNIT) {GENE: XSEA} 
EX7L_HAEIN
     EXODEOXYRIBONUCLEASE LARGE SUBUNIT (EC 3.1.11.6)
     (EXONUCLEASE VII LARGE SUBUNIT) {GENE: XSEA OR HI0397} 
EX7S_BACSU
     PUTATIVE EXODEOXYRIBONUCLEASE SMALL SUBUNIT (EC
     3.1.11.6) (EXONUCLEASE VII SMALL SUBUNIT) {GENE: YQIC} 
EX7S_ECOLI
     EXODEOXYRIBONUCLEASE SMALL SUBUNIT (EC 3.1.11.6)
     (EXONUCLEASE VII SMALL SUBUNIT) {GENE: XSEB} 
EX7S_HAEIN
     EXODEOXYRIBONUCLEASE SMALL SUBUNIT (EC 3.1.11.6)
     (EXONUCLEASE VII SMALL SUBUNIT) {GENE: XSEB OR HI1437} 
EXO1_BPT4
     EXONUCLEASE SUBUNIT 1 (EC 3.1.11.-) (PROTEIN GP47) {GENE:
     47} 
EXO1_BPT5
     POSSIBLE EXONUCLEASE SUBUNIT 1 (EC 3.1.11.-) (D12) {GENE:
     D12} 
EXO1_SCHPO
     EXONUCLEASE I (EXO I). {GENE: EXO1} 
EXO2_BPT4
     EXONUCLEASE SUBUNIT 2 (EC 3.1.11.-) (PROTEIN GP46) {GENE:
     46} 
EXO2_BPT5
     POSSIBLE EXONUCLEASE SUBUNIT 2 (EC 3.1.11.-) (D13) {GENE:
     D13} 
EXO2_SCHPO
     EXONUCLEASE II {GENE: EXO2} 
EXO5_BPT5
     EXODEOXYRIBONUCLEASE (EC 3.1.11.3) (5' EXONUCLEASE)
     {GENE: D15} 
EXOD_BPT4
     EXODEOXYRIBONUCLEASE (EC 3.1.11.1) (3'5' EXONUCLEASE)
     {GENE: DEXA} 
EXON_EBV
     ALKALINE EXONUCLEASE (EC 3.1.11.-) {GENE: BGLF5} 
EXON_HCMVA
     ALKALINE EXONUCLEASE (EC 3.1.11.-) {GENE: UL98} 
EXON_HSV11
     ALKALINE EXONUCLEASE (EC 3.1.11.-) {GENE: UL12} 
EXON_HSV2
     ALKALINE EXONUCLEASE (EC 3.1.11.-) {GENE: UL12} 
EXON_HSV6U
     ALKALINE EXONUCLEASE (EC 3.1.11.-) {GENE: U70 OR 16R} 
EXON_HSV6Z
     ALKALINE EXONUCLEASE (EC 3.1.11.-) {GENE: U70 OR CH3R} 
EXON_HSV7J
     ALKALINE EXONUCLEASE (EC 3.1.11.-) {GENE: U70} 
EXON_HSVEB
     ALKALINE EXONUCLEASE (EC 3.1.11.-) {GENE: 50} 
EXON_HSVSA
     ALKALINE EXONUCLEASE (EC 3.1.11.-) {GENE: 37} 
EXON_NPVAC
     PUTATIVE ALKALINE EXONUCLEASE (EC 3.1.11.-) {GENE:
     ALK-EXO} 
EXON_NPVOP
     PUTATIVE ALKALINE EXONUCLEASE (EC 3.1.11.-) {GENE:
     ALK-EXO} 
EXON_PRVN3
     ALKALINE EXONUCLEASE (EC 3.1.11.-) (FRAGMENT) {GENE:
     UL12 OR AN} 
EXON_VZVD
     ALKALINE EXONUCLEASE (EC 3.1.11.-) {GENE: 48} 
EXO_ECOLI
     POTENTIAL 5'-3' EXONUCLEASE (EC 3.1.11.-) {GENE: EXO} 
EXO_LAMBD
     EXONUCLEASE (EC 3.1.11.3) {GENE: EXO OR REDX OR
     RED-ALPHA} 
EXRN_BPT3
     EXODEOXYRIBONUCLEASE (EC 3.1.11.3) (EXONUCLEASE) {GENE:
     6} 
EXRN_BPT7
     EXODEOXYRIBONUCLEASE (EC 3.1.11.3) (EXONUCLEASE) {GENE:
     6} 
PPD1_BOVIN
     PHOSPHODIESTERASE I (EC 3.1.4.1) (5'-EXONUCLEASE)
     (5'-NUCLEOTIDE PHOSPHODIESTERASE) (FRAGMENT) 
RECJ_ECOLI
     SINGLE-STRANDED-DNA-SPECIFIC EXONUCLEASE RECJ (EC
     3.1.-.-) {GENE: RECJ} 
RECJ_ERWCH
     SINGLE-STRANDED-DNA-SPECIFIC EXONUCLEASE RECJ (EC
     3.1.-.-) (FRAGMENT) {GENE: RECJ} 
RECJ_HAEIN
     SINGLE-STRANDED-DNA-SPECIFIC EXONUCLEASE RECJ (EC
     3.1.-.-) {GENE: RECJ OR HI1214} 
RECJ_SALTY
     SINGLE-STRANDED-DNA-SPECIFIC EXONUCLEASE RECJ (EC
     3.1.-.-) (FRAGMENT) {GENE: RECJ} 
RNC1_YEAST
     ENDO-EXONUCLEASE NUCR (EC 3.-.-.-) {GENE: RNC1 OR NUD1
     OR YKR056W} 
SBCC_ECOLI
     EXONUCLEASE SBCC {GENE: SBCC} 
SBCD_BACSU
     EXONUCLEASE SBCD HOMOLOG (FRAGMENT) {GENE: SBCD} 
SBCD_ECOLI
     EXONUCLEASE SBCD {GENE: SBCD} 
YPCP_BACSU
     POTENTIAL 5'-3' EXONUCLEASE (EC 3.1.11.-) {GENE: YPCP} 


Mazda..